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

Hi Adirondack Jack,

Firstly welcome to the forum 

I think if you wish a scale setup, as you would with scale RC models, search as many pictures from the past as you can and get as much information as you can so you have a picture in your mind of what looks right and what does not.  I know from the world of scale RC planes that some folks make almost perfect scale models with such amazing intricate detail that takes many many hours of dedication to achieve.

In all honesty and at the risk of being flamed, IMHO Jin's engines are not scale replicas, they are fun, educational and wonderful creations of a true artist.  I think Jin designed the M91 to power a model boat or something like the dynamo from PM research is a good size match or build your own creation, have fun with the engine, enjoy it for what it is and if you get the scale bug and have the tools move on to some of the many scale replica engine kits out there as a future project.

Kind regards
Ade