nuckolls.bob(at)aeroelect
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 Posted: Fri Mar 07, 2014 9:30 am Post subject: How to Toggle Speed Brakes with Momentary On Switch? |
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At 11:03 AM 1/11/2014, you wrote:
| Quote: | Thanks Bob and everyone for your most excellent
help. I’m a novice at electrical circuit stuff
as you can tell – but, eager to learn and willing to ask questions.
And yes, I agree, “spoilers” is a more accurate
term for these lift disturbing devices – I’ll correct that.
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It's an understandably mixed bag for terminology . . .
Forces exerted by drag go up with square of speed so extending
these little critters into the slip stream at cruise will, no
doubt, exert substantial drag during a flight condition where
lift is at maximum (attack angle low).
During approach to landing, airspeed is perhaps 1/3 that of
high speed descent and the wing is working harder at a
higher attack angle.
The only two times I experienced the behavior of this system
was in Mooney's on approach. Once at Kerrville with a factory
test pilot, the other at Wichita in a friend's airplane. In
both cases I was encouraged to toggle the boards up and down
while watching the effects on rate of descent.
The extending the boards had no observable effects on airspeed
or angle of attack but a profound effect on rate of descent.
Hence they were behaving more as modifiers of lift
than as dissipators of kinetic energy . . . i.e. spoilers
I think there is a valid argument to be made for both behaviors
dependent upon the flight airplane's flight condition.
I was at Cessna in their Tech Pubs department when Bill Thompson
(founder of Precise Flight) was head of flight test. He was
partners with my teacher, friend and mentor of more than 40 years
(Ken Razak) in a nice old C-195. It was my offer to install a
Cessna surplus ADF-300 in the 195 that introduced me to Ken
and launched a career very rich in opportunities to learn.
I owe much to those two gentlemen . . .
Bob . . .
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