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1. 04:39 PM - trim motor braking (Troy Scott)
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| Subject: | trim motor braking |
--> Glasair-List message posted by: "Troy Scott" <tscott1217@bellsouth.net>
Gentlemen,
I've modified an electric elevator trim scheme (originally designed by Jim
Dutton) and installed it in my Glasair. I'm utilizing a DC reversible
linear actuator to operate a bellcrank, much like the stock
Stoddard-Hamilton design. It seems to work very well, meaning that it
imparts the same range of forces to the trim springs that the original
manual trim mechanism did. The airplane hasn't yet flown, but I see no
reason why it won't be fine. I notice one area that could be improved: The
motor doesn't stop instantly when the current is cut off. It "coasts"
briefly. I know there is an electrical way to make the motor stop quickly
when the current goes off, but I don't yet have any experience in this area.
I've read about "magnetic braking" and "DC motor braking", but I'm not sure
how to implement this feature. Suggestions?
Regards,
Troy Scott
Glasair Super IISRG, N360TS
tscott1217@bellsouth.net
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