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Building Tips and technical articles. => Building techniques => Topic started by: roger on September 11, 2010, 12:51:37 PM
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i remember building one of chuck feltons cardboard airplanes years back, it was a b-f109.and i remember its flying habits were ok but it always had because of the flat bottom airfoil a very high altitude problum. well i thought i would try his new zero in f/m mag but would like some input now that we have stunthanger. there has to be a fix for /DV HB~>this
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I always see those airfoils and think "eww".
But I don't see any reason you couldn't make a cardboard wing with a symmetrical airfoil.
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I always see those airfoils and think "eww".
But I don't see any reason you couldn't make a cardboard wing with a symmetrical airfoil.
Chuck's cardboard techniques are quite innovative, but sometimes it goes to the extreme. The airfoils are just "bad" for any kind of stunt flying. Either just build a conventional wing, or use a bit of balsa for ribs and spars and go symmetrical. If you strip off the inside ply of the cardboard where it has to go around the wing(just leave the outside ply and the corrugations) it can be bent around a pretty tight curve with just a few ribs.
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You can get rolls of single-sided cardboard, with one flat and the corrugations but not the other flat.
But you can't get it rooting around dumpsters at appliance stores.
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phill
the curve is not what concerns me, it is the flat bottom, in flight it keeps the plane flying accedingly at a high altitude.even giving it a lot of down alevator dosenthelp to much but it really wants to climb.
roger y1
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Put some down thrust in the engine. It works in the twiddly stick controlled planes. In reality, making a symetrical airfoil shouldn't be that hard. Just duplicate the top side to the bottom side. I was going to do a corrogated paper stunt plane, but have never ordered the corrogated paper. H^^