Ailerons and things

[ms08]

On a bi-plane does the force exerted by the ailerons equal the sum of the two ailerons i.e. if they deflect different amounts (top and bottom though the same on each side) will it have any adverse effects of the flying characteristics?

Mike

[Sparky Paul]

The airplane "sees" the total of the deflections.
Any 'adverse' effects should be small if the deflections are similar for both wings.
If there's a lot of difference between top and bottom, fix it.

[ms08]

Thanks Sparky Paul
It is not too drastic just the top aileron moves a little more than the bottom probably due to the geometery of my linkages - will try and have a tweak.

On another topic is the amount of lift at take off the same as on landing and the air speed presumably also. Ignoring flaps etc I am thinking the force of gravity is the same in both situations so therefore landing speed must be the same? as speed at point of rotation or does tha fact that you flare out mean you can drop the speed to slightly less?

Thanks
Mike

[Sparky Paul]

There's a minimum speed for flight. Below it, the plane can't take off.. or will be descending.
Planes are usually accelerating when taking off, so that minumum speed is passed generally while the plane is on the ground and accelerating. Rotation moves the direction the lift vector operates, to lift the plane.
Over rotate, the plane can't lift.. or it does and stalls.
Planes are descending, but not decelerating, when approaching for a landing..
Not quite enough lift to maintain level flight. Rotation then cuts that speed more, for the touchdown.
Over rotate, the plane stalls.