REFLECTOR: Speed brake usage question

[David Scharfenberg]

The maximum airspeed for speed brake extension is 110, which is less than
the gear speed.  On other planes I fly, the speed brakes can be deployed at
any speed.  This helps on a quick decent and helps bleed off speed for gear
extension.  I have been wondering if the airspeed for partial speed brake
extension would be more than the current 110 limit.  This would make the
speed brake more useful.  Of course I know who sets the actual limit on my
plane, but  don't really want damage it doing the airspeed tests.


Dave Scharfenberg
std/RG


on 11/7/04 10:12 AM, Kufalk at kufalk at wi.rr.com wrote:

I have never flown an airplane with a speed brake.  Is there ever a
situation where you would want to extend the speed brake only partially
down?
 
I am looking at switches to actuate the speed brake and I am thinking about
one that has a spring return to center for the down position.  Then I could
run it just like the flap switch on a Cessna 150.  If I want 30 degrees of
brake, I would hold the switch for 3 seconds.  (The actuator moves the brake
panel about 10 degrees per second to a maximum of 60 degrees)  In the up
position it would stay there and retract all the way on it's own.  I would
install the switch just above the throttle so I could reach it with my left
index finger when my hand is on the throttle.
 


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