RV4 roll trim

[sf3543]

The RV4 project that I acquired had servos for pitch and roll trim, but I didn’t care for the external tab mounted on the aileron for the roll.
So, after having built some RV8s, I decided to build up a similar RV8 system for the 4, since I had a set of springs in my parts bin.
I won’t permanently install it yet, while I build on, but it tests out fine. (Oh yeah, now I have to undo the existing aileron trim tab!)

 

[Scott Hersha]

Personally, I like the manual system better. I had the same electric servo system you show on both of my RV8’s, but the manual system is so much easier, especially on an RV4. You don’t need to change it much or very often, and if you have an EFIS/autopilot controlled system, the manual won’t work for you, but as I said, lateral trim usually doesn’t require that much input. Below is pictured what I had on both of my RV4’s, and both RV6’s. They work very well and you know right where the trim setting is by looking/feeling the trim lever.

 

[fixnflyguy]

The RV4 project that I acquired had servos for pitch and roll trim, but I didn’t care for the external tab mounted on the aileron for the roll.
So, after having built some RV8s, I decided to build up a similar RV8 system for the 4, since I had a set of springs in my parts bin.
I won’t permanently install it yet, while I build on, but it tests out fine. (Oh yeah, now I have to undo the existing aileron trim tab!)

I installed mine in the aileron, but ditched the external hinge - half tab and made a tab designed similar to the elevator installation. Servo still in aileron per the VANS kit they once (maybe still do) offered. Works great. I have elevator, aileron and flaps all on the MAC grip.