RV-6A Bellcrank

[Zero4Zulu]

Working on my rebuild project and discovered that my aileron bellcranks are different than my drawings. The drawing show that the legs should be 3.375 and 3.0 with a 137 degree angle. Mine are 3.375 and 3.125 and a little straighter
angle. I guess this would give less throw of the stick to achieve aileron movement? Why would this different than the drawing? We're there revisions over time with these?

 

[Doug]

Are 'yours' new purchase from Vans or out of the RV-6a you are rebuilding?

My preview drawing 19a Rev4 suggest that the 3.0/3.375/137 numbers were that way from the initial drawing release. I'll have to dig around to find the build drawings but I am pretty sure they are the same.

It would indeed be interesting to know if there were any later revisions to the belcrank.

 

[az_gila]

IIRC the bellcranks were a "cut it out yourself" item in the early -6 kits.

Sounds like it might be just a production error by the original builder.

Why not just remake the part re-using the the original bearing, which is a better part than the later substitutes?

 

[Zero4Zulu]

I called Van's and they recommend replacing these bellcranks, so I ordered new ones. There were no other configurations of Bellcranks I guess. I don't know why the builder would have made them different from the plans? He's dead so I can't ask him... I have lots of questions about why he did things the way he did. I have been working at making things back to the plans for years now...

TIP: DON'T EVER BUY A OLDER RV AND ATTEMPT TO REBUILD IT!