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On my airplane, I stall at 80 kias with no flaps and 78 kias with 25° of flap. 25° of flap gives my lowest stall speed. I use this setting for my instrument approaches.
2/80 = 2.4%. 100% - 2.4% - 97.6% therefore no flaps are about 97.6% as 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 hinge for the normal protruding aluminum hinges to change the Fowler Flap on the Legacy to a split flap.
• According to him, this should be worth about 6 knots at Reno Speeds due to the decreased parasitic drag caused by removing the protruding flap hinges.
• Also according to him, the split flaps are 95% as effective as the standard Fowler Flaps.
If the above facts are correct and the stall speed/takeoff distance is not significantly affected, it would seem that changing the standard Fowler Flaps to split flaps would be a good "speed mod" for all Legacies.
I presume that this was considered during the design of the Legacy and wonder if anyone has more information about why the designer decided to go with Fowler Flaps. Also any predictions as to what changing from Fowler to split flaps would do to takeoff distances 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
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