"Jay Honeck" wrote in message
ups.com...
Many if not most Bonanzas don't use flaps even for short field and
this didn't look short. As some one from there mentioned it's 4000
feet at 1200 MSL. There is no take off maneuver even short field at
high altitude in mine that calls for any use of the flaps.

That's interesting -- I never realized that Bo pilots didn't need to
use flaps for departure.

I presume there is something about the wing that makes them
unnecessary?

Both Vx and Vy for virtually all light aircraft are without flaps.



The only time a POH will recommend flaps for takeoff is short field, and
then the speed used is a speed below Vx. This is a speed to clear close in
obstacles and does not result in best angle of climb. It is a compromise
speed used because the short field distance doesn't allow the aircraft to
accelerate to the greater Vx speed.



You might call this "compromise" with flaps speed Vxwithflaps, but they
don't.



Mostly the aircraft that have this "lower than Vx with flaps speed" used for
takeoff have fairly powerful engines. My Cessna 185, for instance has this
speed published and the POH shows 20deg flaps for short field. But once past
the close in obstacles one should accelerate to Vx and raise the flaps to
clear far obstacles.



If the airspeed is in the green arc, the airplane will climb better without
flaps.



Karl