Hi Vincent, do my best to help you out of your bad vibrations.

By the way, I happened to see the 1:6 Svenson Stoch kit for the first
time during my stay in Luxembourg, and bought it later at home.

For the present 1:5 project i have planned to use a Torcman outrunner, direct driven of course, and I haven't heard of any vib problems from those using the engine.

Besides the gear, it could be the Storch nose structure based on relatively long vertical struts especially with electrics. I have planned to use CF-tubes, also diagonally, to make it stiffer from
firewall onwards. Cowlings will also be of CF composite.

I should start building soon and send you some pictures later on.
You may not be too busy with the Storch as I understood.

Wish u all the best, JRN