I once had a situation that moved the trim near the limit -
I think Robin & Brian would agree that it would be almost impossible
to hold onto the Moose with full trim ! A VERY good reason to have a
separate breaker for the trim, in an easily accessible location, and
to have thought through popping it quickly if a problem appears. I was
reaching for it when I saw the right-seat camera pressing the trim
button - having buttons on the stick is a mixed blessing ! Definitely
NOT a good thing for a Rebel, as you hardly ever use the trim,
but handy with the Moose ... Try to wire the mike button and the
trim button in positions that are accessible but not too exposed to
hanging objects like cameras, and well separated - for that last call
on short final ! (Hitting the trim makes it exciting !! ;-) )
If the servo manufacturer says it's a bad idea, I would try to
find an alternative - geared car seat motor, or window winder motor -
or add an arm for leverage .... The Mac servos are great, but
designed for light loads.
Certainly the flap pull force in the Moose is quite significant ...
- I would move the <floor> mount back a few inches to improve the
pull angle - and to help clear the stick. Can't say what your roof
mount will be like - depends on the arm. The ailerons will not add
a lot, but I know some have gone to manual levers for aileron droop -
I like that - keep it simple ! :-) (For that matter - forget
about the droop .... it might hurt you in a crosswind anyway ... )
......bobp
-------------------------------orig.-------------------------
On Friday 20 January 2006 12:08 am, Mike Kimball wrote:
Has anyone with a flying Super Rebel / Moose ever ran the elevator trim
servo to it's limits in flight to see how hard it would be to over-ride a
runaway or broken trim servo? A conversation with Scott at Ray Allen got
me thinkin'. He wants me to trade in my MAC-8A servo for the newer, and
supposedly better constructed T3-12A servo. He also thinks that my plan
to use a T2-7A servo to move the aileron pivot block on the roof for
aileron droop is ambitious. He's afraid that the servo will be working
too hard to overcome aerodynamic forces on the block and will fail. Any
opinions on the aerodynamic forces acting on the block? Operationally, I
will most likely be in level flight whenever I am making changes to the
droop. I.e., I'll be deciding and setting the droop based on conditions
while on downwind. That also made me think about the fact that I have
separated the aileron droop function from the flaps. There has been some
concern that it will be a muscle man pull on the flap lever with my roof
mounted system. At least I have removed any force on the block that the
ailerons might induce. Food for thought.
Mike
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