Wolfgang,
Regardless of what the NASA report says, they never flew the wing as
implemented by Lancair. Extension of the flap more than a few degrees
beyond 0 does little for lift. The pitching moment does change the
attitude, but does not significantly change the stall speed (a few knots is not
significant). The drag addition is significant. The AOA is another
story. While the attitude changes with flap extension, the AOA is still
high and slower speeds just brings one closer to a stall, thus reducing margins
to take care of loss of pilot attention, wind shear, distractions and anything
that leads to mis-application of up elevator with pitch sensitive
controls. It is very easy to reach critical AOA at slow speeds, with or
without flaps..............
Scott Krueger
In a message dated 4/16/2012 7:20:08 A.M. Central Daylight Time,
Wolfgang@MiCom.net writes:
-7 to -10 isn't going to make much difference in
flight. If the latest manual says to use -7 then go for it.
The purpose of reflex flaps is to reduce drag
(lets you go faster) while giving up some lift coefficient. At higher speeds
you don't need that extra lift coefficient.
Reflex will also move the center of lift forward
causing a nose up force affecting the trim needs.
For landing, you give extra flap to increase the
lift coefficient (and the drag) so you can go slower without falling out of
the sky.
See attached file for more details.
Wolfgang
----- Original Message -----
Sent: Saturday, April 14, 2012 12:01 AM
Subject: L320 flap setting
I have the exact concerns
reported by Rob Stevens in Australia. Since the manual is vague on
cruise flap settings, can some experienced L320-360 fliers help us with what
is the best cruise settings? Is it -7deg. , -10deg., or somewhere
else. Since construction variances can create different “faired-in
positions”, is there an angle which can be measured from the top or bottom
wing surface? Can anyone explain the aerodynamic reasons for reflexed
flaps? Rob and I need help!
Ed Gray Dallas L360
N77ZG XP360 Silver Hawk injection MT 3 blade prop Dual Dynon Skyview
SL30
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