ORIGINAL: nickrage
i have built a bi plane (foam) to run only rud and elev. the thing with it though is it is not self righting , if you were to just let it go straight it probably would go for a little bit fine but as soon as you touch the rudder it's rolling back and forth no correcting at all then of course hit the ground.
The only thing I can think of is maybe not enough di hedral or way to much throw on rudder. any help as to what would cause this left to right crazy roll
thxs
You've got a couple of performance results that usually don't happen to one airplane at the same time. Interesting bird you built. It'll be great fun developing it.
Self righting (if you mean on the roll axis) usually is a function of dihedral or dihedral effect. Sounds like there isn't any. Do you mean roll or pitch or yaw for "self righting"?
When a model rolls from rudder input, that's usually from too much dihedral or dihedral effect. Yeah, try reducing the rudder throw a lot and see what happens.
Got any pictures?
Let us know what you try and what that does. You've got a very interesting test subject.