I'm looking for a formed sheet-metal clevis rod-end that is made to be jam-nutted onto a threaded rod or bolt. Not necessarily the forged style like this, but more like this:



CubCrafters uses a similar part on their tail wires:



What's that called?

Thanks.

Dangerous.

I can find them called an "end link drop clevis" or a "clevis mount bracket" Summit racing has them on their web site in various sizes and prices.

Clevis link bracket?

8GCBC wrote:Dangerous.

Explain please?

They appear to be a E-Brake clevis, not sure you're going to find many sizes...

http://www.lokar.com/product-pgs/ebrake-cables-conn-cables/ebrake-cable-pgs/rearbrake-clevis-kits.html

Halestorm wrote:

8GCBC wrote:Dangerous.

Explain please?

They appear to be a E-Brake clevis, not sure you're going to find many sizes...

http://www.lokar.com/product-pgs/ebrake-cables-conn-cables/ebrake-cable-pgs/rearbrake-clevis-kits.html

I think there was an SB. I see those on aircraft and it makes look twice. I do not like them.

In the fishing world, and automotive world they are called 'stamped clevis ends'.

Hale is correct, they are usually used on apps like e-brakes and I don't see why they'd be a problem on an airplane
used in an appropriate app either;

http://www.controlcables.com/clevises/

8GCBC wrote:I think there was an SB. I see those on aircraft and it makes look twice. I do not like them.

Please give a real reason.

It's very similar in concept to the cable eye end you see on thousands of Cessnas, controlling the most important flight control surface.



The Cubcrafters part I linked in the OP is the replacement parts in the ASTM Safety Alert they issued late last year.

denalipilot wrote:Clevis link bracket?

Dale Moul wrote:I can find them called an "end link drop clevis" or a "clevis mount bracket" Summit racing has them on their web site in various sizes and prices.

Yes. Tough to find in smaller sizes appropriate to AN4.

Rob wrote:'stamped clevis ends'.

Thanks.

Being a poor kid from the beach not an engineer...

"Just don't look right". Hard to see the visual integrity. Cessna looks a little better.

This is for the pushrod linkage on my electric elevator trim in the tail. I'm sure this will spark some discussion.

I have a 10-32 / .190 eye spherical ball end threaded onto my servo output shaft. I need to make the run down to the trim bellcrank, where I'm trying to decide between 1) using a clevis fork or 2) another spherical rod end attached to the side of the bellcrank. With either method, I want some adjustability in the pushrod length for tuning, hence the threaded rod into the pushrods. Here's the design I've come up with:



The bellcrank connection could go either way, as mentioned above: Clevis or spherical bolted to the side. The stamped clevis design seems like it gives a wider opening than the forged style for the servo connection where it must accommodate the rod end, and on the bellcrank end, it must only accommodate about .110. This is the servo trim tab actuation, not elevator actuation. Forces are light.

Keep in mind what forum we're in. This is an experimental amateur homebuilt. There's obviously many ways to skin this cat. I could use male rod ends threaded right into the end of the pushrod, I could use a smaller diameter steel rod instead of larger diameter aluminum with end plugs.

Do it like your illustration, but have jamb nuts on both threaded ends. After you adjust for length snug them up and mark them with an ink pen so if they move (they won't) you can easily tell. Can't hurt to use a dab of thread lock on that jam nut also. We have connections like that on the RANS FWIW

courierguy wrote:Do it like your illustration, but have jamb nuts on both threaded ends. After you adjust for length snug them up and mark them with an ink pen so if they move (they won't) you can easily tell. Can't hurt to use a dab of thread lock on that jam nut also. We have connections like that on the RANS FWIW

I definitely intend to use jam nuts, should have included those on the illustration (drawing was 2 minutes.)

Your design looks fine to me. I've never built an airplane though...

Zane,

If you're using Ray Allen servos, why not use their pushrod kit. Much lighter and no need to reinvent the wheel. You'll need to move the servo a lot closer to the bell crank(I'd do that anyway to save weight). Info at:

http://www.rayallencompany.com/RACmedia/instructionsT2andT3.pdf

Otherwise, I'd go with a linkage like Bob designed for the LSA. A T2 tube with one end flattened and reinforced and a 10-32 nut welded to the other end. I'll try to post a picture later.

My $.02.

Papa Foxtrot wrote:Zane,

If you're using Ray Allen servos, why not use their pushrod kit. Much lighter and no need to reinvent the wheel. You'll need to move the servo a lot closer to the bell crank(I'd do that anyway to save weight). Info at:

http://www.rayallencompany.com/RACmedia/instructionsT2andT3.pdf

Otherwise, I'd go with a linkage like Bob designed for the LSA. A T2 tube with one end flattened and reinforced and a 10-32 nut welded to the other end. I'll try to post a picture later.

My $.02.

I'm using a BristolSG, which is the same company as RAC but a little more stout, with a brass output shaft. I wasn't big on the plastic output shaft of the RAC, despite how strong they say it is. I've mounted the servo on a bracket that bridges the steel angles that the horizontal stabilizer carry-through attaches to,which means I need something more stout than 10-32 threaded rod like the RAC pushrod kit.

Here 'tis. Hope this URL works:

Papa Foxtrot, I have that exact drawing on my work table right now. The chromoly T2 spec might work well for my servo to bellcrank connection too. Thanks.

8GCBC wrote:

Halestorm wrote:

8GCBC wrote:Dangerous.

Explain please?

They appear to be a E-Brake clevis, not sure you're going to find many sizes...

http://www.lokar.com/product-pgs/ebrake-cables-conn-cables/ebrake-cable-pgs/rearbrake-clevis-kits.html

I think there was an SB. I see those on aircraft and it makes look twice. I do not like them.

Apparently you haven't been around Cubs much. Those things been holing the tails on airplanes for a whole lot longer than you've been on this earth.

MTV