Wow .... that's a lovely pair you have there! ;c)
It is of course the available steam pressure/volume pairing that dictates the horsepower achieved in a rather direct proportion. So then, it is only to be determined what pressure and RPM regime the engine was designed to operate in, as to the power level it is supposed to be able to attain and provide.
@Stoker, thanks for the confirmation. Since the bore & stroke are almost the same as the Stuart 5A, then the main variables are the steam delivery pressure & the rpm. So, probably the Sipp is rated at a lower rpm & steam pressure; which is what it’s designed for.
Yes, exactly right, but sorry Mike I really didn't mean to step so heavily into your thread.
I should perhaps add that I agree with your assessment that the engine seems capable of more than that at which it is rated. Probably the rating is as much a reflection of the Sipp boiler that is designed to be used with these engines, and its strength/volume limitations.
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