nuckolls.bob(at)aeroelect
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 Posted: Sun Jul 19, 2009 7:38 pm Post subject: No Title |
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At 06:06 PM 7/19/2009, you wrote:
| Quote: | Good Evening Bob,
I agree with your evaluation, but back when Mooney tried it, most pilots didn't care for it. You would regularly find the interrupt button taped down thus deactivating the system. I feel certain that some method could be made to work and still be acceptable to the average pilot, but no one has, as yet, figured out that method. |
Yeah . . . PC (positive control) by Brittain as I recall.
A totally pneumatic wing leveler that operated directly
though valves at the back of the turn-coordinator driving
"tomato juice can" servos. A truly elegant design for its
time. Just found that the system is still offered at:
http://www.brittainautopilots.com/
I liked it. You couldn't hurt it by direct over-ride while
engaged. No servos to smoke, no clutches to burn, no
engagement solenoids to burn out. This was TSO-C3a hardware
which tells us how far back that goes. I did a little white
paper for Cessna way back when that suggested large diaphragm
pneumatic force cartridges operated by pitot/static delta-P
and permanently rigged to ailerons. A simple reed valve system
driven from a turn-coordinator would drive a simple set
of electronics that consumed less than 1 watt of total power.
Three moving parts, no lubrication issues, etc. etc. But they
were the proud owners of ARC who was already offering a line
of autopilots that plagued with every failure mode that such
devices might offer . . .
| Quote: |
Had JFK jr just let his autopilot fly his airplane, we would probably have a light plane pilot high in our government hierarchy by now. |
Hmmm . . . you can lead a horse to water. . .
All we can do as teachers/designers/suppliers is offer well
considered advice backed by a history of recipes for success. Dr.
Dee speaks of a human condition known as "cognitive dissonance"
http://en.wikipedia.org/wiki/Cognitive_dissonance
which we've all observed first hand: "I KNOW that
smoking is bad for me . . . but I (like/need/want)
to do it". We've all observed a pilot's worst ever
day in the cockpit that appeared to rise from a
dead-short-between-the-headphones. It's called the
"bell curve". For the very best among us, there MUST
be individuals who balance out the other end of the
curve.
| Quote: |
'Tis a quandary indeed!
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Let us continue to strive for position on the upper
slope of that curve . . .
Bob . . .
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( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
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[quote][b]
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