Trim Tabs

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jchisolm
Posts: 23
Joined: Tue Jun 17, 2014 9:56 pm

Trim Tabs

Postby jchisolm » Sat Aug 05, 2017 11:58 am

Finishing some wing issues and got to thinking about the trim issues. I'm putting in a G3X with autopilot so I'm not too concerned about aileron trim as I'm a big fan of letting the autopilot fly XC while I look out the window. In my view the AP would take care of the aileron trim in level flight.
I'm only installing 2 axis so rudder trim will still be necessary and elevator trim for non-AP work.

I've been looking at the various RV setups and it seems Van's has gone to the bias spring approach and not supplying any hinged trim tab. I like the simplicity and that you dont have all that hardware inside the elevator or rudder you have to try and balance out. My worry is the servo force and spring forces needed to hold a CT tailed Express in trim for landing or what I might need for rudder trim. I know there are several production aircraft that use the bias spring method. I've also see some manual trim "kits" for expermentials that use the springs.

I would appreciate any input on what kind of stick forces you might have for a un-trimed landing configuration and how (or if) you have rudder trim and what is your setup.

I could build the trim tabs and take that approach but I like the clean look of a no trim tab control surface.
Joe Chisolm
Express CT builder
Marble Falls, Texas

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