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Originally Posted by Marasmusine
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The glib answer to the first question is "2d Cr and another 2D of fragmention" and I'm afraid that there are no reasonable stats. If you're using GM control over reality to make it work in your setting you're going to have to decided how well you want it to work.
If I was going to dress up my technobabble in such a stiuation I'd be waiving my hands and invoking the "pulse jet" used in the V1 as a similar device..
Contrariwise there were Ve2 stats for Stirling Engines in Vehicle Exansions 2. the TL5 stats were only a little better on weight than late TL5 double-expansion steam engines and actually poorer thna the very late quadruple expansion steam engines or the hypothetical sextuple exansion engines.
The stats for TL7 and 8 Stirling engines are much better but they use pressurized hydrogen or helium to get a better working fluid. I wouldn't climb into a steampunk vehicle using pressuried hydrogen though i might watch from a safe distance.