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

Actually, if you only wanted to make the two engines run at closer to the same speed, at our toy steam temperatures and pressures, you'd likely get closer by reversing compound theory and feeding the larger bore engine with steam fresh from the boiler with the smaller bore then run off of its exhaust. Still be a rather serious mismatch I'm afraid.

That is good point Daniel, another thing that might have helped is an intermediate receiver between the two engines. One good thing with the Stuart is that it had drain cocks which made it much easier to warm through and clear the condensate.