Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

A very interesting line up Daniel, you probably can tell which one is my favourite. 

I've only ever owned one aero IC engine which was made by this company which are happily still in business:

https://www.eifflaender.com/engines

I no longer own my little P.A.W diesel engine (i sold it to fund a steam purchase) but it was full to play with if a bit messy.