RV8 aileron stop ideal outer diameter

[8MikeXray]

Does anyone know what the optimum outside diameter is for an RV8 delrin aileron stop?
I’m trying to find the ideal od that will allow full deflection without the aileron bumping/pumping
without having to try multiple sizes.

Thanks

 

[RV7 To Go]

I made aluminum stops but put them on the outer hinge brackets instead of the inner ones. Made it easy to get the proper throw on the ailerons and good contact against the stop. Not sure what your plan was for a delrin stop.

 

[moespeeds]

I don't have any stops at all. I considered adding them, but really it's hard to get full deflection anyway. My legs are in the way!

If you're trying to avoid the stick shaking at full deflection, it's really a non event. If I was going to make a stop, I'd start with about 0.160" OD over the bolt size.

 

[moespeeds]

This might help

Mickey's RV8 Site | Aileron stops

www.rv8.ch

 

[rvbuilder2002]

I made aluminum stops but put them on the outer hinge brackets instead of the inner ones. Made it easy to get the proper throw on the ailerons and good contact against the stop. Not sure what your plan was for a delrin stop.

View attachment 84712

Not the best plan.
Any time you move the stick and hit the stops ( pre take-off control check , aerobatics, etc., you ar going to be putting a span wise asymmetric torsion load on one of the ailerons.
That is why the airplanes are designed with the stop located at the same point that the controlling force is applied.

 

[Taltruda]

Does anyone know what the optimum outside diameter is for an RV8 delrin aileron stop?
I’m trying to find the ideal od that will allow full deflection without the aileron bumping/pumping
without having to try multiple sizes.

Thanks

Are you trying to eliminate the aileron buffeting at full deflections when aileron rolling? They all seem to do it, and I don’t think making a hard stop to limit your throw is the answer.. just set the deflection to whatever the plans call for, then fly the plane.. when performing an aileron roll, my preferred roll rate is as slow as I can go.. it’s more pleasant on everyone then going hard to the stop anyway.

 

[Jonnyb]

Does anyone know what the optimum outside diameter is for an RV8 delrin aileron stop?
I’m trying to find the ideal od that will allow full deflection without the aileron bumping/pumping
without having to try multiple sizes.

Thanks

5/8” seems to be favourite.

Many just accept what 5/8” gives in regards to deflection. Others remove and replace multiple times to make sure they get the max deflection as per the plans.

Unless you’re doing competition aeros 5/8” seems to be a good size.

I went to 5/8” and will see what that gives when the wings are on, then fly it and make a decision.

 

[8MikeXray]

5/8” seems to be favourite.

Many just accept what 5/8” gives in regards to deflection. Others remove and replace multiple times to make sure they get the max deflection as per the plans.

Unless you’re doing competition aeros 5/8” seems to be a good size.

I went to 5/8” and will see what that gives when the wings are on, then fly it and make a decision.

Perfect, 5/8”

just the answer I was looking for.

Thank you Jonnyb!

 

[mburch]

I don't have an RV-8, but my RV-7 has the same wing and aileron setup. According to my notes, I used 1/2" OD for my stops, which resulted in a range of aileron travel a few tenths of a degree under the maximum limits. I pressed in aluminum spacers, and used black delrin for UV resistance:

 

[rvbuilder2002]

What ever diameter you use, if you drill the bolt hole very slightly off center, you get a stop that has an adjustable range depending on the rotated position when the bolt is tightened.

Keep in mind that accepting less travel “because more just puts you in the buffet zone during full deflection rolls”, means you have less roll control authority at low speed (which is the primary dictator for the specific design deflection angle).