Algodoo

Device that can serve both as a wing or propulsion (the rear one).
Inspired by Killinich k-wing;
Does not use spawning, so no leaks;
tested up to speed of 250-300m/s;

I'ts no way a precise wing simulation; lift depends linearily on speed and angle of attack; Generally designed to work at high speeds.

airplane needs about 80 m/s to takeoff.