Ray Allen Electric Elevator Trim Deflection

[Majorpayne317641]

I’m retrofitting to the vans electric trim kit from manual trim. I’ve got the tab set up and I noticed in the construction manual under the test chapter is says I should have trim tab 35 degrees down and 25 degrees up. Am I miss reading something? I can only get 30 degrees down and 14 degrees up. I measured my friends RV-8 and he has it biased more tab up then down (more nose down trim ability). I can always fly and see when I run out of trim on either side. But I’d like to get it roughly close.

 

[rvbuilder2002]

I’m retrofitting to the vans electric trim kit from manual trim. I’ve got the tab set up and I noticed in the construction manual under the test chapter is says I should have trim tab 35 degrees down and 25 degrees up. Am I miss reading something? I can only get 30 degrees down and 14 degrees up. I measured my friends RV-8 and he has it biased more tab up then down (more nose down trim ability). I can always fly and see when I run out of trim on either side. But I’d like to get it roughly close.

You will always need more nose up trim than nose down.
Is the actuator rod connected to the hole in the control horn nearest to the bottom skin of the trim tab?

 

[Majorpayne317641]

Yes it is. I do have more nose up trim capability than nose down the way it is adjusted now.

 

[Mike S]

Ray Allen has 3 different servos, each with different travel. 0.7", 1", and 1.2".

You may not be getting enough travel at the tab if using the wrong servo with a shorter travel.

Ray Allen Company - Servos

Servos for experimental aircraft.

www.rayallencompany.com

 

[Majorpayne317641]

Ray Allen has 3 different servos, each with different travel. 0.7", 1", and 1.2".

You may not be getting enough travel at the tab if using the wrong servo with a shorter travel.

Ray Allen Company - Servos

Servos for experimental aircraft.

www.rayallencompany.com

I used the vans kit for an RV-8A I imagine they sent the correct one?

I checked and they send 1.2in for both aileron and elevator trim kits.

 

[Mike S]

I checked and they send 1.2in for both aileron and elevator trim kits.

Sounds like you need to move the pushrod closer to the hinge line on the trim tab control horn.

Or, test fly it as is, and then if you need more travel move it.