Newps wrote:


Roger (K8RI) wrote:

On Sat, 01 Sep 2007 21:54:03 -0600, Newps wrote:



Roger (K8RI) wrote:



"I think" meaning I don't know for sure, that flaps slow the
acceleration enough that nothing is gained in distance by using them.

It reduces ground roll by 20%.


It might get me into ground effect a bit earlier, but the end result
would take more distance to clear thatl 50 foot obstical.

That is not the case. You clear 50 feet sooner with flaps than without.
A lot sooner, 33% in fact. A Bonanza with a 520 at 2800 pounds, 5000
feet and 32 degrees gets these results: Flaps 20...Lift off in 876 feet
and thru 50 feet in 1200 feet. No flaps...Lift off in 944 feet and thru
50 feet in 1600 feet. There will be minor differences among the various
Bonanza models but all will perform basically the same.

Yes, a few knots less takeoff speed pays huge dividends in distance.

Matt