{"id":163,"date":"2012-10-30T23:44:18","date_gmt":"2012-10-31T04:44:18","guid":{"rendered":"http:\/\/lutorm.wordpress.com\/?p=163"},"modified":"2012-10-30T23:44:18","modified_gmt":"2012-10-31T04:44:18","slug":"sportair-workshop","status":"publish","type":"post","link":"https:\/\/blog.familjenjonsson.org\/blog\/2012\/10\/30\/sportair-workshop\/","title":{"rendered":"EAA SportAir Composite Construction Workshop"},"content":{"rendered":"<p>The Experimental Aircraft Association has been running these workshops teaching different aircraft building skills around the country for a long time, and when I saw that the Composite workshop was going to be offered in Riverside, I jumped on the opportunity to get some momentum on my <a title=\"Introducing a new category: Airplane building!\" href=\"http:\/\/atom.familjenjonsson.org\/blog\/2012\/10\/25\/airplane-building\/\">airplane building project.<\/a>\u00a0(It was apparently a good idea, too, \u00a0because our instructor, John Brecher, said this was the second to last one. From now on they&#8217;re only doing them in Oshkosh&#8230;)<\/p>\n<p>We worked on two little pieces, a flat piece of foam we glassed, cut in half, and then joined together with a fillet joint and a small section of an airfoil that we hot-wired in polystyrene foam, added spar tapes top and bottom, and then skinned with fiberglass. This took two full days, mostly because of the need for the epoxy to cure for 24h between each layup. I&#8217;ll let the pictures speak for themselves below, but it was a nice introduction to the techniques used and it doesn&#8217;t seem that hard. Of course, like I said at the end of the workshop, being able to manufacture some pieces is one thing, trusting them with your life is another&#8230;<\/p>\n\n\t\t<style type=\"text\/css\">\n\t\t\t#gallery-1 {\n\t\t\t\tmargin: auto;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-item {\n\t\t\t\tfloat: left;\n\t\t\t\tmargin-top: 10px;\n\t\t\t\ttext-align: center;\n\t\t\t\twidth: 33%;\n\t\t\t}\n\t\t\t#gallery-1 img {\n\t\t\t\tborder: 2px solid #cfcfcf;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-caption {\n\t\t\t\tmargin-left: 0;\n\t\t\t}\n\t\t\t\/* see gallery_shortcode() in wp-includes\/media.php *\/\n\t\t<\/style>\n\t\t<div id='gallery-1' class='gallery galleryid-163 gallery-columns-3 gallery-size-thumbnail'><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon portrait'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5938.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"127\" height=\"150\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5938-127x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"&#039;West system epoxy\" aria-describedby=\"gallery-1-200\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5938-127x150.jpg 127w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5938-255x300.jpg 255w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5938-510x600.jpg 510w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5938.jpg 851w\" sizes=\"auto, (max-width: 127px) 100vw, 127px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-200'>\n\t\t\t\tThis is the resin we used, West system 105 + hardener.\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon portrait'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5937.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"141\" height=\"150\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5937-141x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Uni glass tape\" aria-describedby=\"gallery-1-199\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5937-141x150.jpg 141w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5937-282x300.jpg 282w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5937-565x600.jpg 565w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5937.jpg 943w\" sizes=\"auto, (max-width: 141px) 100vw, 141px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-199'>\n\t\t\t\tThis unidirectional fiberglass tape is used when you need all strength in one direction, like the spar tape next.\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5935.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"60\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5935-150x60.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Spar tape\" aria-describedby=\"gallery-1-198\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5935-150x60.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5935-300x120.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5935-600x240.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5935.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-198'>\n\t\t\t\tThis spar tape is made up from multiple layers of the UNI tape on the previous picture. It&#8217;s maybe 5mm thick and completely rigid in the fiber direction, while noticeably flexible in torsion.\n\t\t\t\t<\/dd><\/dl><br style=\"clear: both\" \/><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5933.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"145\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5933-150x145.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Foam\" aria-describedby=\"gallery-1-197\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5933-150x145.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5933-300x291.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5933-600x583.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5933.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-197'>\n\t\t\t\tThis is the foam we used. The gray sheet is polyurethane, the blue polystyrene.\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5939.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"103\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5939-150x103.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Applying micro to the foam\" aria-describedby=\"gallery-1-164\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5939-150x103.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5939-300x207.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5939-600x415.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5939.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-164'>\n\t\t\t\tThe first step is to apply micro slurry to the foam surface. This fills the open cells on the surface of the foam and ensures a good bond between the glass and the foam.\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5940.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"118\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5940-150x118.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Squegeeing micro\" aria-describedby=\"gallery-1-165\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5940-150x118.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5940-300x236.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5940-600x472.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5940.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-165'>\n\t\t\t\tThe micro slurry is scraped into the foam cells with a squeegee, ensuring that only a thin layer is left on the surface.\n\t\t\t\t<\/dd><\/dl><br style=\"clear: both\" \/><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5941.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"124\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5941-150x124.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Laying up the fiberglass cloth\" aria-describedby=\"gallery-1-166\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5941-150x124.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5941-300x248.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5941-600x496.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5941.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-166'>\n\t\t\t\tThen the fiberglass cloth is added, and the epoxy resin worked into the fibers so that there&#8217;s no air bubbles. (I haven&#8217;t done such a good job here.)\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5942.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"111\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5942-150x111.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Adding peel ply\" aria-describedby=\"gallery-1-167\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5942-150x111.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5942-300x222.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5942-600x445.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5942.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-167'>\n\t\t\t\tThe final step is to add &#8220;peel ply&#8221;, a layer of Dacron fabric which the epoxy doesn&#8217;t stick to. After the expoxy has cured, this can be peeled off (hence the name), exposing a fresh, textured surface for bonding additional layers of fiberglass to. This saves you from having to sand the surface to get a good bond.\n\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5954.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"118\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5954-150x118.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Removing peel ply\" aria-describedby=\"gallery-1-179\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5954-150x118.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5954-300x237.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5954-600x475.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5954.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-179'>\n\t\t\t\tOn the second day, we removed the peel ply, exposing the fiberglass.\n\t\t\t\t<\/dd><\/dl><br style=\"clear: both\" \/><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon portrait'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5955.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"139\" height=\"150\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5955-139x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Bonding the pieces\" aria-describedby=\"gallery-1-180\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5955-139x150.jpg 139w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5955-279x300.jpg 279w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5955-559x600.jpg 559w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5955.jpg 932w\" sizes=\"auto, (max-width: 139px) 100vw, 139px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-180'>\n\t\t\t\tThe object was now to make a T-joint. The first step is to just fix the pieces with some hot glue to hold them in place while the glass is being applied.\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon portrait'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5969.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"139\" height=\"150\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5969-139x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Final fillet joint\" aria-describedby=\"gallery-1-194\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5969-139x150.jpg 139w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5969-279x300.jpg 279w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5969-558x600.jpg 558w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5969.jpg 931w\" sizes=\"auto, (max-width: 139px) 100vw, 139px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-194'>\n\t\t\t\tThis is the final joint after applying peel ply. It was a bit messy and I didn&#8217;t want to get epoxy on the camera so there are no pictures of the intermediate steps. Basically you first fill the corner with thick micro to make a radius that the cloth can follow. Then three layers of glass of increasing size were added over the corner, followed by the peel ply.\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5944.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"129\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5944-150x129.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Foam core template\" aria-describedby=\"gallery-1-169\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5944-150x129.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5944-300x258.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5944-600x516.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5944.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-169'>\n\t\t\t\tTo cut the airfoil, we started by mounting the templates, one on each side of the foam core, making sure they are parallel.\n\t\t\t\t<\/dd><\/dl><br style=\"clear: both\" \/><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5945.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"100\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5945-150x100.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Hotwiring\" aria-describedby=\"gallery-1-170\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5945-150x100.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5945-300x200.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5945-600x400.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5945.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-170'>\n\t\t\t\tThen you cut the foam using a steel wire stretched between two posts, heated to red hot using a variable transformer. By sliding this along the template on both sides, you cut the exact shape into the foam. If all goes well&#8230;\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5946.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"100\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5946-150x100.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Hotwiring\" aria-describedby=\"gallery-1-171\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5946-150x100.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5946-300x200.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5946-600x400.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5946.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-171'>\n\t\t\t\tHere, the bottom has been cut and they are working on the top.\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5947.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"92\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5947-150x92.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Cut airfoil\" aria-describedby=\"gallery-1-172\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5947-150x92.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5947-300x185.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5947-600x370.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5947.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-172'>\n\t\t\t\tThis is what I ended up with. It&#8217;s pretty good, but you can clearly see some artifacts where we weren&#8217;t quite at the same point on both sides. Staying synchronized so you don&#8217;t cut diagonally is the big challenge.\n\t\t\t\t<\/dd><\/dl><br style=\"clear: both\" \/><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5948.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"90\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5948-150x90.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Top surface\" aria-describedby=\"gallery-1-173\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5948-150x90.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5948-300x180.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5948-600x360.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5948.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-173'>\n\t\t\t\tThe top surface came out better. The &#8220;tab&#8221; on the left is the trailing edge. It will later be cut away, but not until the bottom has been glassed.\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5949.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"135\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5949-150x135.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"UNI spar tape material\" aria-describedby=\"gallery-1-174\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5949-150x135.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5949-300x270.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5949-600x540.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5949.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-174'>\n\t\t\t\tThe first step is to lay up the thick spar caps on the top and bottom using the unidirectional tape.\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5950.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"142\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5950-150x142.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"BID skin\" aria-describedby=\"gallery-1-175\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5950-150x142.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5950-300x285.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5950-600x570.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5950.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-175'>\n\t\t\t\tThen we cut these pieces of BID that will become the surface skin.\n\t\t\t\t<\/dd><\/dl><br style=\"clear: both\" \/><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5951.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"107\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5951-150x107.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Bottom glassed\" aria-describedby=\"gallery-1-176\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5951-150x107.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5951-300x214.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5951-600x429.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5951.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-176'>\n\t\t\t\tHere I&#8217;ve done the bottom spar tape and skin. The glass looks a bit dry.\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5952.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"117\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5952-150x117.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Trailing edge\" aria-describedby=\"gallery-1-177\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5952-150x117.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5952-300x235.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5952-600x471.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5952.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-177'>\n\t\t\t\tThis is the trailing edge. When we cut the foam &#8220;tab&#8221; away, the top skin will join this part, making a sharp end.\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5953.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"106\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5953-150x106.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Peel ply on leading edge\" aria-describedby=\"gallery-1-178\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5953-150x106.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5953-300x213.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5953-600x426.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5953.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-178'>\n\t\t\t\tOn the leading edge we put peel ply where the cloth ends. This makes the fibers lie nicely flat against the surface so the other side will overlap cleanly.\n\t\t\t\t<\/dd><\/dl><br style=\"clear: both\" \/><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5956.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"105\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5956-150x105.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Trimming edges\" aria-describedby=\"gallery-1-181\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5956-150x105.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5956-300x211.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5956-600x422.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5956.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-181'>\n\t\t\t\tAfter curing, the excess glass can be trimmed with a handy multi-tool.\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5970.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"114\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5970-150x114.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Leading edge\" aria-describedby=\"gallery-1-195\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5970-150x114.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5970-300x228.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5970-600x457.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5970.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-195'>\n\t\t\t\tThe leading edge after removing the peel ply. A small ridge of resin is visible that will have to be sanded down.\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5971.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"97\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5971-150x97.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Top side glassed\" aria-describedby=\"gallery-1-196\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5971-150x97.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5971-300x194.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5971-600x388.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5971.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-196'>\n\t\t\t\tHere the top side of the airfoil has been laid up with spar tape and skin. Note that the foam &#8220;tab&#8221; is now gone and the trailing edge tapers to a thin edge.\n\t\t\t\t<\/dd><\/dl><br style=\"clear: both\" \/><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5957.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"93\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5957-150x93.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Vacuum bagging demo\" aria-describedby=\"gallery-1-182\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5957-150x93.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5957-300x187.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5957-600x374.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5957.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-182'>\n\t\t\t\tThe final technique that was demonstrated (we didn&#8217;t make one each) was vacuum bagging where you cover the object in plastic and pull a vacuum that &#8220;squeezes&#8221; excess resin out. Here we&#8217;re starting with a flat foam piece with a little shaped object in the middle.\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5959.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"91\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5959-150x91.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Add resin\" aria-describedby=\"gallery-1-184\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5959-150x91.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5959-300x183.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5959-600x366.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5959.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-184'>\n\t\t\t\tThen you add epoxy normally.\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5960.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"121\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5960-150x121.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" aria-describedby=\"gallery-1-185\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5960-150x121.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5960-300x242.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5960-600x484.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5960.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-185'>\n\t\t\t\tThough you don&#8217;t have to worry so much about getting too much epoxy in the fibers, since it will get squeezed out.\n\t\t\t\t<\/dd><\/dl><br style=\"clear: both\" \/><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5961.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"98\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5961-150x98.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Peel ply\" aria-describedby=\"gallery-1-186\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5961-150x98.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5961-300x196.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5961-600x393.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5961.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-186'>\n\t\t\t\tAdd peel ply on top as usual.\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5962.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"85\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5962-150x85.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Add padding\" aria-describedby=\"gallery-1-187\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5962-150x85.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5962-300x171.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5962-600x343.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5962.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-187'>\n\t\t\t\tThis &#8220;padding&#8221; is a thick material that will suck up excess resin and enable the vacuum to get everywhere across the piece.\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5963.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"111\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5963-150x111.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Cover with plastic\" aria-describedby=\"gallery-1-188\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5963-150x111.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5963-300x222.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5963-600x445.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5963.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-188'>\n\t\t\t\tThen the entire layup is covered with plastic.\n\t\t\t\t<\/dd><\/dl><br style=\"clear: both\" \/><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5964.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"117\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5964-150x117.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"... seal it\" aria-describedby=\"gallery-1-189\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5964-150x117.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5964-300x235.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5964-600x471.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5964.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-189'>\n\t\t\t\tThe plastic obviously needs to be totally sealed. The yellow is a very sticky double-sided tape that&#8217;s used to attach the plastic. The little pipe poking out is where the vacuum pump is attached.\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5966.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"108\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5966-150x108.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"... and pull vacuum\" aria-describedby=\"gallery-1-191\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5966-150x108.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5966-300x217.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5966-600x435.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5966.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-191'>\n\t\t\t\tWhen the vacuum pump is turned on, it sucks the plastic tight against the surface, making sure there are no air pockets in the epoxy or between the glass and the foam.\n\t\t\t\t<\/dd><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5967.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"129\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5967-150x129.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"24 in Hg\" aria-describedby=\"gallery-1-192\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5967-150x129.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5967-300x259.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5967-600x519.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5967.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-192'>\n\t\t\t\tAfter sealing the piece with some extra duct tape visible in the background, the vacuum was up to 24 in Hg, which is sufficient.\n\t\t\t\t<\/dd><\/dl><br style=\"clear: both\" \/><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5968.jpg'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"113\" src=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5968-150x113.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"Well-contoured glass\" aria-describedby=\"gallery-1-193\" srcset=\"https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5968-150x113.jpg 150w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5968-300x226.jpg 300w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5968-600x453.jpg 600w, https:\/\/blog.familjenjonsson.org\/blog\/wp-content\/uploads\/2012\/10\/mg_5968.jpg 1000w\" sizes=\"auto, (max-width: 150px) 100vw, 150px\" \/><\/a>\n\t\t\t<\/dt>\n\t\t\t\t<dd class='wp-caption-text gallery-caption' id='gallery-1-193'>\n\t\t\t\tYou can clearly see how well the cloth is conforming to the shape of the foam piece. Unfortunately I don&#8217;t have any pictures of the piece after curing, because it didn&#8217;t really have time to cure fully before the workshop ended.\n\t\t\t\t<\/dd><\/dl>\n\t\t\t<br style='clear: both' \/>\n\t\t<\/div>\n\n","protected":false},"excerpt":{"rendered":"<p>The Experimental Aircraft Association has been running these workshops teaching different aircraft building skills around the country for a long time, and when I saw that the Composite workshop was going to be offered in Riverside, I jumped on the opportunity to get some momentum on my airplane building project.\u00a0(It was apparently a good idea, &#8230;<\/p>\n<p><a href=\"https:\/\/blog.familjenjonsson.org\/blog\/2012\/10\/30\/sportair-workshop\/\" class=\"more-link\">Continue reading &lsquo;EAA SportAir Composite Construction Workshop&rsquo; &raquo;<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[2],"tags":[7,10,12],"class_list":["post-163","post","type-post","status-publish","format-standard","hentry","category-airplane","tag-airplanes","tag-composites","tag-fiberglass"],"post_mailing_queue_ids":[],"_links":{"self":[{"href":"https:\/\/blog.familjenjonsson.org\/blog\/wp-json\/wp\/v2\/posts\/163","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blog.familjenjonsson.org\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.familjenjonsson.org\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.familjenjonsson.org\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.familjenjonsson.org\/blog\/wp-json\/wp\/v2\/comments?post=163"}],"version-history":[{"count":0,"href":"https:\/\/blog.familjenjonsson.org\/blog\/wp-json\/wp\/v2\/posts\/163\/revisions"}],"wp:attachment":[{"href":"https:\/\/blog.familjenjonsson.org\/blog\/wp-json\/wp\/v2\/media?parent=163"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.familjenjonsson.org\/blog\/wp-json\/wp\/v2\/categories?post=163"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.familjenjonsson.org\/blog\/wp-json\/wp\/v2\/tags?post=163"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}