{"id":375,"date":"2011-12-18T15:13:42","date_gmt":"2011-12-18T23:13:42","guid":{"rendered":"http:\/\/www.stol750project.info\/?p=375"},"modified":"2011-12-18T15:13:42","modified_gmt":"2011-12-18T23:13:42","slug":"bottom-skin-preparation","status":"publish","type":"post","link":"https:\/\/stol750project.info\/?p=375","title":{"rendered":"Bottom Skin Preparation (3hr)"},"content":{"rendered":"

Another day, and a fresh pair of eyes on the aligning skin problem. To cut a long story short, I found that the rear rib at station 2 was twisted against the rear channel making the hole spacing at that end incorrect. So, a little more unriveting and with some effort we got the rib in its proper place and we could roll the skin out and cleco it into place on the ribs.
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\nWe’ve had quite a lot of rain recently and the remaining parts are in the crate in the dog run and so the metal got wet and oxidised\/corroded so it doesn’t look its best right now. I bought some Nuvite Metal Cleaner<\/a> which will buff that right up but I will wait until later to apply it.<\/p>\n

For some reason I don’t have a picture of them, but between most of the ribs you install an l-angle under the skin which adds as a stiffener and reduces “canning” noise in the air. I drilled a hole in one end of each of the angles and clecoed it in place under the skin. Then, with a centre line showing through the remaining holes, I back drilled into the angle through the pre-drilled holes in the skin.
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\nIn that picture you can see four l-angles installed along the centre of the skin. Here’s one from underneath:
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In time honoured tradition, the pilot holes needed to get enlarged to their final size, an A4 rivet, and I also went through the rear ribs holes and opened them to size 30 as well.
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I didn’t drill the inboard rib as it overlaps the inboard skin so I had to cleco that in place first. It also has an l-angle down the middle and I drilled it and clecoed into place too.
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Final task of the day was to drill out these last few holes to size 30.
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Next up is to position the nose skins and trailing edge skins so that I can drill through them into the spar; the spar and rear channel do not have pre-drilled holes so that is going to be a lot of work. Can’t wait to do the deburring!!<\/p>\n","protected":false},"excerpt":{"rendered":"

Another day, and a fresh pair of eyes on the aligning skin problem. To cut a long story short, I found that the rear rib at station 2 was twisted against the rear channel making the hole spacing at that…<\/p>\n

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