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Rudder Trim with Spring Bias

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Albert Gardner

Joined: 10 Jan 2006
Posts: 455
Location: Yuma, AZ

Posted: Mon Mar 10, 2008 9:18 am Post subject: Rudder Trim with Spring Bias

I used drawing OP38-6 (Electric Trim System) for information on spacing the

springs. I can't remember the un-stretched length of the spring but I left a

6" gap between the trim servo arm and the end of the cable from the rudder.

The spring never goes slack but I was more worried about over stretching it.

I trim full right rudder on take off and it seems to be about right

depending on climb out speed and there seems to be adequate trim available

for cruise and descent. I didn't measure the pedal force but I think I

should have stretched the springs another 1/2" or so. I'm going to order a

spring from Vans and see how far it will stretch without distortion. If I

need more tension I'll add another spring inside of the one that's there.

Albert Gardner

Yuma, AZ



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_________________
RV-9A N872RV
RV-10 N991RV

rv10builder(at)verizon.ne
Guest

Posted: Mon Mar 10, 2008 10:24 am Post subject: Rudder Trim with Spring Bias

Sure seems like another great option with a kit that already exists!

My questions? Have you called Van's on this and spoken with Ken K? He might 

have some insight into the spring tightness and maybe even guidance on the 

way it is setup.

Please do keep us updated on the testing and any changes made /results

Thanks for sharing!

Pascal

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scottmschmidt(at)yahoo.co
Guest

Posted: Mon Mar 10, 2008 11:35 am Post subject: Rudder Trim with Spring Bias

Speaking of rudders and rudder trim I had a bad thing happen in Vegas last weekend.  I flew down and on Friday for the Nascar race and parked my plane into the wind and installed my rudder lock.  On Saturday a front came through, the winds reversed  had gusts up to 50 knots and it broke my rudder lock that I made and caused the rudder to slam side to side and did some cosmetic damage to it. It sheared two of the three rivets on both rudder stops that are attached to the metal brackets on the HS spar. I could not believe it.  I don¢t think I¢ll be able to fix it and make it look like new so I¢ll probably be building a new one. (just priced it out last night, $400 for a new rudder) I want to add a nice electric rudder trim to it and this will give me a chance to do  that.  I will also be re-designing my rudder lock.  It had a weak point in it, I knew it did but never thought there would be enough force on it to break it.  

Live and learn and luckily I can do some learning for the group. Make sure you use a rudder lock and yes, there can be 50 knot gusts when you would never predict it.  At least the weather was great for the races with a good breeze and Kirby Chamblis flew his Edge 540 for the crowd before the race. 



I am looking into the "best practices" for rudder trim to adapt to my new rudder and like the idea presented in this thread.  I am going to leave my wedge on my new rudder and add the rudder trim.  That way it will very little deflection in cruise.  

 

Scott Schmidt

scottmschmidt(at)yahoo.com

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