Originally posted by DragonHeart
Hi,
Hope someone can help with this quick question im buliding a ARFT kit but its come with plastic nylon clevises, ive been advized to use metal ones.....
Is it ok to use metal ones on all the connections ie: ailerons, rudder and elevator ?
Are these alot stronger than plastic ?
And do i need to use threadlock on them once thier in place ?
Thx in advance for your time
Quick reply.
metal ones will be fine in any place you have plastic ones. But, they are possibly not necessary. There is no urgency to replace the nylon with metal. Metal ones will be more durable, but do you need bullet-proof clevises when the control surface is balsa?
As for threadlock, NO, NO, and NO!
If clevises move slightly on the threads, it is not a problem. Due to the nature of push-rods, it would be most unusual for a clevis to rotate even 1/8th of a turn when attached. Further, the pushrods are threaded for a reason, clevises have a purpose, they are meant to be adjusted.
The trim of your plane changes over time, and unless you want to constantly have off-center trim adjustments on your TX, then you have to adjust the trim by adjusting the clevises on your pushrods.
gus