cruisingfoiler,
"Firstly you can't make the claim that 'this' foiling design is unstable. You have specified a foil, but not a configuration. What configuration are you referring to? E, V, T, Y, L, U, O, C, J, L, S, or inverted (ladder) Pi? Until you specify this (for all foils in the configuration), you cannot claim that that a particular design is pitch, heave and yaw unstable."
I thought I was very clear, A GOE611 foil with the leading foil angled upwards a couple of degrees and the trailing GOE611 angled downward a few degrees at the bottom of their respective rudder. Do you need the polars?
The reason it is unstable is because without the hull dampening effect there is no altitude control and it will porpoise.
I have built airplanes with canards and they are designed to porpoise. That is how they prevent stalling. The canard loses lift before the main wing can stall.
Talador
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Posted by: taladorwood@yahoo.com.au
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