---------------------------------------------------------- Glasair-List Digest Archive --- Total Messages Posted Mon 04/26/04: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 04:39 PM - trim motor braking (Troy Scott) ________________________________ Message 1 _____________________________________ Time: 04:39:47 PM PST US From: "Troy Scott" Subject: Glasair-List: trim motor braking --> Glasair-List message posted by: "Troy Scott" 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