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Post by ratcheeroo on Sept 21, 2022 2:05:51 GMT
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Post by Burkeomatic on Sept 21, 2022 2:37:55 GMT
The only thing I could think of possibly would be the torsional rigidity when it comes to using the ailerons, but I am assuming this would be going fairly slow as to be a non issue. It would probably also be optimal to round the edges as opposed to leaving them square, the sharp area will create a stress concentration instead of evenly distributing the load, those square edges will be the first point of failure, yet again, may not matter depending on usage. Check out this powerplant frame, it connects the transmission to the differential via a c channel instead of the transmission and differential mounting to the body. it undergoes quite a bit of load in most directions, but it is mostly torsional. The whole thing weighs maybe 10 pounds, I can pick it up over my head and install it with one hand, or balance it on my head and guide it in the holes it needs to go into.  I have seen some success with that glad brand adhesive wrap, or whatever it is, the stuff that sticks to bowls and stuff. If you really wanted to be light, there is always tissue paper, and of course good ole packing tape. |
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Post by ratcheeroo on Sept 22, 2022 23:09:56 GMT
LOL I probably should have taken a pic before I folded the wing over. So there are wing ribs there and a piece to support the aileron hinge. Same kind of concept I guess, although I haven't done any real building for quite a few days now, the computer time has been well spent and I think the Mamba and PC-21 are just about good to go and incorporate some of my weight saving strategies, should be a good weekend , feeling a bit more motivated.
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Post by Monte.C on Sept 22, 2022 23:42:47 GMT
ratcheeroo I like where you're going there. I've thought in similar ways but figured everywhere I have just paper or film I'd put my finger through it! One other option to consider - around here I can get 3mm FB that's identical to DTFB but thinner. I've used it on a couple very small airframes but nothing that I've actually flown. It makes a MAD light plane. I've always meant to weigh it for a direct weight comparison. I promise to weigh it soon and post the results here. But maybe supply of this stuff is severely limited based on where you live. I've gotten it from Dollar General. Oh, the other obvious thing is to use lots of the lightweight drywall filler. The more you use, the lighter your plane gets.
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Post by ratcheeroo on Sept 23, 2022 1:00:13 GMT
LOL!! I think the only time I used the drywall filler stuff was on the snow skimmer #1 , everything else I try to do tight joints and the wood glue dilution seems to work good on those so I don't mess with what works for me. I am always keeping my eye out for something thinner but haven't seen anything like what you describe. Hmmm.. maybe Amazon.
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Post by Monte.C on Sept 23, 2022 1:43:17 GMT
LOL!! I think the only time I used the drywall filler stuff was on the snow skimmer #1 , everything else I try to do tight joints and the wood glue dilution seems to work good on those so I don't mess with what works for me. I am always keeping my eye out for something thinner but haven't seen anything like what you describe. Hmmm.. maybe Amazon. The label says it's from a company called Artskills, based in Bethlehem, PA. I think it probably comes right from the same factory as DTFB. I called them once with a question, I don't remember what, of course she couldn't answer my question. You could call them to figure out how to get some, if there's a store near you who carries it or who can get it. The problem with wood glue, no matter what the brand or how you dilute it, it has weight. The trick with lightweight drywall filler is that it has negative weight. If you use too much the plane won't sit still on the table. There you go - you learn something new every day.  |
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