Thank you! This is an old kit, but with my additional scratch work I really like the outcome.
This is my idea to have a real rotary engine:
A srue (down to 2mm) with a hole for a 1.2mm brass tube
A shaft of 1mm brass (and the front a bit thinner due to missing space):
The sprue can glued into the model, and on the back of the engine you will need a 1mm hole for the shaft:
mounted to the engine:
Mounted on the Nieuport (have used the same solution for Pup and Nieuport)
I hope you get the idea .... That is a easy and cheap solution, but it works.
Cheers,
Frank