Aileron Control Stops - 4B

[Nev]

What are guys doing for aileron control stops ? Previously I was under the assumption that the control stick fixture provided a stop by limiting the travel of each stick. But on a recent 50 hour check we noted that the aileron linkage was able to contact the aileron hinge mount, so the control stick housing is not limiting movement on that side. I would prefer to have a softer material, maybe bush nylon or delrin. Any ideas appreciated.

[AKKen07]

Hi Nev, The limits should be managed by the geometry of the system bellcranks etc. There isn’t a hard physical “stop” in the control stick assembly or elsewhere. In my case I had to carve a curve into my control stick assembly where the stick hit the edges of the fixture - to enable full movement. I guess If you are getting interference somewhere in the system you may need to do something similar. I found a pic indicating where my interference was. 65265290240__D0FE3FE9-56D0-4EC6-B4C3-97E7FD7F053D.jpg

[Nev]

Yep mine hits the same place where your finger is pointing on one side. On the other side, the aileron push-rod contacts the hinge mount on the wing.

[svyolo]

My assumption was that it was always done by the hinge mount/pushrod. I had to remove some material from the control stick mount. Rescue tape on the rod? A piece of silicone tubing?

[jaredyates]

I remember this came up for a Canadian builder who had a regulatory person who required control stops for the ailerons.
This was a discussion from the LSA section but I was thinking there was another somewhere.

https://bearhawkforums.com/forum/bearhawk-lsa-plans-build/27828-aileron-control-stops

[Steve W]

For the Patrol,I installed a plate over the rear control stick floor cutout limiting the side to side travel of the control body to the proper amount of deflection. Put a strip of rubber edge protection on each side.

[mbaerobat]

The MDRA representative required me to install aileron stops before he’d sign off for flight. I built Dutchman clamps that were attached to the bellcrank support tube to limit motion. A little fiddly to install but serves the purpose. Some thin wall rubber or heat shrink tubing on the stopper could be used to provide a cushion.

[Nev]

Nice solution. Graham Johnson has made a very similar fitting with a plastic block attached. Both make for an elegant solution. I was thinking that one per side would provide the limiting I was after.

0784E622-99B2-40C6-A312-D04192B2BDCB.jpg

[Bcone1381]

From that idea, springs another....for those who might avoid welding.

Below is pictured the MS27405 tubing clamps. Type A has one lobe. Type B has two lobes. A fitting would be added to the loop clamp to create the stop.

Screen Shot 2023-11-12 at 1.52.34 PM.png