elevator trim servo

cholladay · #1 08-28-2010, 11:25 AM

I just put togather my elevator trim and I have to much travel on my trim servo when compared to the diagram. Does anyone know the correct trim servo for the elevator? I have the Ray Allen T3-12A which has 1.2" of shaft movement. I think I may have the wrong servo.

sstellarv10 · #2 08-28-2010, 05:08 PM

That is the correct servo. I have the same one and I didn't have any travel problems.

Phil · #3 08-28-2010, 05:27 PM

Yep. That's the right one.

Wayne Gillispie · #4 08-28-2010, 09:20 PM

and make sure everything matches diagrams. I did not have any problem with travel until I connected cables. Very poor instructions in this area. I ended up figuring it all out and noted all thread amounts on each side of brackets in front and rear of cables as well as rod ends if you need that info. Whatever you do, don't rivet the rear brackets on like I did. Use #6 screws and nut plates. It will make it much easier to make adjustments at elevator end. Also use a 1/2" drum sander on forward brackets where cables touch to provide 1/32" clearance. Good luck.

Mouser · #5 08-29-2010, 09:18 AM

The 12A is the right servo. Here's some photos of my install for you to compare against:

Elevator Trim Push-Pull Cables, Nose-Up by Mouser NerdBot, on Flickr

Elevator Trim Push-Pull Cables by Mouser NerdBot, on Flickr

Elevator Trim Bellcrank Underside by Mouser NerdBot, on Flickr

Hope that helps!

cholladay · #6 08-30-2010, 12:09 PM

OK in your first photo according to the diagrams from Vans you have to much rotation of the bell crank. Vans shows the cable closest to you in the photo to be horizontal to the mounting plate. Your photo ,which is also looks like mine goes below the point that the instruction call out for Max. travel.

Phil · #7 08-30-2010, 12:22 PM

The photographs look correct to me...

Van's drawing (of the cables) appears to depict the neutral position, with the shadow drawings (of the bell crank) depicting full nose-down and nose-up limits.

The photograph shows the full nose-down position.

cholladay · #8 08-30-2010, 05:49 PM

OK i got it. I guess I was thinking about it to much. Thanks for the pics and the input, I understand now. I originally thought the actual pic was full nose down. It makes sense, I was not looking at the shadow drawings.