Mark
I think I meet your requirement as a theoretician in that I have never built an F1D with endplates (correction, I have never made an F1D!). However I will put forward some thoughts for others to shoot down.
I assume the purpose of dihedral, or tip plate is to restore the aeroplane to level flight if it starts to sideslip. In a sideslip the forward, lower, wing (or endplate) sees a greater angle of attack which increases the lift. The lift acts at right angles to the lifting surface be it the panel of a dihedral wing or a tip plate. The CG will normally be a little above the motor stick. With normal dihedral the correcting moment will be the change in lift times the distance to the CG which will be about half the semi span. With a tip plate the correcting force will be the change in lift on the tip plate, which will be horizontal times its distance above the CG (a smaller moment arm than the semi span). So my initial feeling would be that the wing posts should be longer with tip plates to get the same dihedral effect.
John Barker - England
Received on Sat May 28 2011 - 02:52:34 CEST
This archive was generated by Yannick on Sat Dec 14 2019 - 19:13:46 CET