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1. 07:33 AM - Re: Re: Flap Controller (Lenny Iszak)
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| Subject: | Re: Flap Controller |
We should all be practicing engine out best glides with flaps 15 or more,
because when the engine actually quits it won=99t have the residual t
hrust
and glide performance will be closer if you simulate it with flaps 15. On
an RV-4 that we did engine out testing in it took flaps 40 to match the
engine out glide performance. Very different airplane, but unfortunately I
don=99t have the cojones to stop the engine and see what happens in m
y -10.
However, that=99s not what I was talking about. With engine out on ta
keoff
you need to be turning. Your turn radius is way too wide if you fly best
glide speed (especially at full gross weight). Also way too fast and you
risk overshooting the runway. Flaps 15 works out much better. Higher stall
margin, tighter turn radius, better lift/drag, slower speed.
To support my Cl/Cd assertion I have Xfoil plots for the RV-10 wing, and
also got drag polars from several flight tests.
Either way, I=99m sticking to my position that automatic flap positio
ning is
good to have. =F0=9F=99=82 Turning in a 45 degree bank in a high anxiety si
tuation
over the trees while riding the stall warning doesn=99t leave much at
tention
to fiddling with flaps.
Lenny
On Jan 30, 2023 at 11:23:33 PM, Bob Turner <bobturner@alum.rpi.edu> wrote:
> Do you have a reference or data to back up this assertion? If true, we
> should all be practicing engine-out best glide with flaps 15.
>
> --------
> Bob Turner
> RV-10 QB
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