David Rind wrote:

Mike Rapoport wrote:

Some flaps (maybe even full flaps) until airborn, accelerate in ground
effect and then climb. If you are interested in this stuff, read F.E.
Potts book on bush flying.

Mike
MU-2


"grubertm" wrote in message
oups.com...

So what's the best procedure for a sand strip, 4000AGL, 50ft obstacle ?
I can see the advantage of 10 deg. flaps for a mud strip, but I am not
sure whether the increased friction due to sand is worth the decrease
in climb rate..

- Marco


I haven't been following this thread that closely so I may have missed
something, but "full flaps"? I thought that once you got to 40 degrees
of flaps on a 172 you were just adding drag without any appreciable
reduction in stall speed. I can't see how that would get you into ground
effect any quicker....


He said maybe. Some aircraft do use full flaps for takeoff. The Cessna
does not. You want 20 degrees to break ground quickly, accelerate to 80
mph and milk the flaps up and then climb. If you have an obstacle then
you accelerate to 60 mph with the flaps down and keep it there and climb
above the obstacle. Once above the obstacle accelerate to 80 and get
the flaps up.