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1. 01:23 PM - Re: Re: Flap motor - failure, prevention and request (Chris Welsh)
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| Subject: | Re: Flap motor - failure, prevention and request |
When I was installing the flap actuator, I could not get the bolts on the nylon
bushing tight without the actuator binding. I ended up reaming the holes in
the nylon blocks out to 5/16 and making some bushings. I also capped the top
of the blocks with a piece of .06 aluminum. This allowed me to torque the bolts
properly with no binding of the actuator. I have no idea if this will help
the longevity of the flap motor, but it can't hurt. The motor was noticeably
quieter with no binding as would be expected. The other thing I did was add
two zener diodes back to back at the motor connector hoping to alleviate voltage
spikes and arcing of the motor brushes. Again, no data yet as to whether or
not this increases motor longevity but again it can't hurt.
Chris Welsh
________________________________
From: "Speedy11@aol.com" <Speedy11@aol.com>
Sent: Thursday, October 15, 2009 3:15:30 PM
Subject: RV8-List: Re: Flap motor - failure, prevention and request
Vince,
I've heard of a lot of RV-8 flap motor failures, but never has anyone (that
I'm aware of) investigated the reason for them - and certainly none
have discovered the wiring problems you spoke of.
I am just reaching 20 hours on my RV-8A and I'm going to take your advice
and strengthen the wiring. I took care to secure the flimsy wires when
building, but I'm going to address the issue again.
Thanks for reporting your info.
Stan Sutterfield
Twenty
> hours on my RV-8 and the flap motor went south. Inspection reveals t
>he
> wire insulation right where the wires enter the motor housing opened up
>
>(both wires) and shorted then broke. I suspect a lot of the intermittent
> op
>eratio problems posted on the list are due to the wires internally
> breaking
>. The cleaning and reinstallation may temporarily cause the wires
> to reconn
>ect thus masking the real problem.
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