RE: Red Wing Sbach profile
Yes, the overall structure has been improved and the factory is putting more glue on the joint on our 2nd batch
But the tri stock has solved the problem in all the instances we have seen.
It should have been added to the kit and in the instructions from the get go - as not all builders know or think of these things.
It is now in the kit and should have a note in the baggie with the tristock, with EACH plane to epoxy to the mount after installing the engine for vibration dissipation
95% of the planes we didn not hear of any problem with. We are assuming those users used tristock without being promoted, and/or did not suffer the vibration problems.