Sheeted foam core wing. I made 3 circles with polyspan and doped them on. Did this before I got the CF tissue I have now and wondering if it would be worth the trouble to strip this off and replace it with the CF. I think I learned this circle thing from Bill Mazoni so it might be ok, The rest of the wing is getting covered with Microlite film so no strength there. Do you think it will hold?
You don't need reinforcement beyond covering the entire wing, tip to tip, with silkspan or graphite veil. All the failures encountered (and the nutty schemes for reinforcement that Windy, et. al came up with) were because they built the airplane, then covered it only up to the fuselage sides, creating a stress concentration there, where all the force is applied. Cover the wing before installing it, not an issue.
They were also the first of us to discover that having lots of effective power (compared to what came before) greatly increases the cornering loads. The ST60 was the first widely-used engine that would routinely destroy the construction methods at the time. At first everyone thought it was the vibration, but it's much more that you can maintain speed in the corners more effectively, and thus increase the structural loads. Folding a wing on a stunt plane was rare to nearly unheard-of before the mid-80's, ST60 started it, and then piped engines raised the failure rate to a remarkable degree.
Brett
Topic: Is this enough reinforcement? (Read 1111 times)
