Crow or Flaps for Landings?

[johnsloper]

Hi,

Do the power planes (my new Kadet Senior) also use crow for landing like the sailplanes?

Or just flaps? Or flaps with a tad of down aileron?
When are the other times for flaps usage... take off and slow flying?
And what percentage of the trailing edge should be flaps vs. aileron?

John

[flying4fun]

John,
Most of the time, powered planes normally use only flaps. And you are exactly right, the other times people use flaps are for short takeoffs and slowflight. Im not sure, but i think most of the time people use 40-50% of the trailing edge. Hope this helps.

Alex

[hul]

crow increases drag which kills the glide. This will let you land at a much steeper angle without increasing speed. This is useful for gliders but not for your typical trainer which will have poor glide anyway.
Flaps increase maxiumum lift which will let you fly slower. This may be useful if your wing loading is high. Don't think this is necessary for your Kadet Senior.

Hans

[uscra112]

Generally hul has it nailed. I would only contribute that SOME full-scale planes used drooping ailerons combined with flaps, but this often creates poor roll response at low speeds, so I wouldn't do it on a model. It can also make the model more prone to tip-stalling, so should be avoided for that reason also. One full-scale example where drooping ailerons were used also had spoilers on the wing outboard panels, to improve roll control.