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From: Lorn H Olsen <lorn@dynacomm.us>
Subject: Re: Legacy Flaps - Fowler vs Split

On my airplane, I stall at 80 kias with no flaps and 78 kias with 25=B0 =20=

of flap. 25=B0 of flap gives my lowest stall speed. I use this setting =20=

for my instrument approaches.

2/80 =3D 2.4%. 100% - 2.4% - 97.6% therefore no flaps are about 97.6% as =
=20
effective as flaps.

Why not just use no flaps?

On Sep 8, 2009, at 6:00 AM, Lancair Mailing List wrote:

> From: "Douglas Brunner" <douglasbrunner@earthlink.net>
> Date: September 3, 2009 10:34:39 PM EDT
>
> Spoke to a Reno Racer recently who substituted a simple flush carbon =20=

> hinge for the normal protruding aluminum hinges to change the Fowler =20=

> Flap on the Legacy to a split flap.
> 	=95 According to him, this should be worth about 6 knots at Reno =
=20
> Speeds due to the decreased parasitic drag caused by removing the =20
> protruding flap hinges.
> 	=95 Also according to him, the split flaps are 95% as effective =
as =20
> the standard Fowler Flaps.
> If the above facts are correct and the stall speed/takeoff distance =20=

> is not significantly affected, it would seem that changing the =20
> standard Fowler Flaps to split flaps would be a good "speed mod" for =20=

> all Legacies.
>
> I presume that this was considered during the design of the Legacy =20
> and wonder if anyone has more information about why the designer =20
> decided to go with Fowler Flaps.  Also any predictions as to what =20
> changing from Fowler to split flaps would do to takeoff distances =20
> and stall speed.
>
> D. Brunner
> N241DB

--
Lorn H. 'Feathers' Olsen, MAA, ASMEL, ASES, Comm, Inst
DynaComm, Corp., 248-345-0500, mailto:lorn@dynacomm.us
LNC2, FB90/92, O-320-D1F, 1,615 hrs, N31161, Y47, SE Michigan