Flaps tend to be more effective on Propellor powered aircraft due to the slipstream (power on) from the prop increasing the airflow over the flapped area. This may be particularly noticable with one engine inoperative.
Fowler flaps (as fitted to most large transport aircraft and some small ones) deploy by moving down and backwards. They increase camber and wing area.
Other types of flaps (eg simple or split) just increase the camber with no change to the wing area.
Last edited by whiskey1; 5th May 2012 at 06:45.