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Yes to prop driven flash steam.
No I don't know the rules but you could look them up.
No, I don't think of rockets or jets as heat engines per se. Heat engines are usually meant to describe external combustion piston engines. There are many varieties, but they have in common the need to pass heat through a heat exchanger of some sort to heat a fluid that drives a working piston. At least that's what I think of, and mean here.
I know about Lippisch and for years was an avid R/C model builder. I've built a true flying wing (nurflugel) that maneuvers without any vertical tail surface. But that's a whole other subject.
Here's some of the parts for a flash steam engine I've been working on -- my version of a de-rated racing engine, loosely based on the world record holder's.
I cast and machined all of the iron parts, including the Dykes piston ring. I also cast the exhaust collector, not machined yet. The con-rod big end bearing is a roller type. Yet to do are the crankshaft and geared pumps. The original intent is to try to see if would be applicable as a solid fueled outboard motor for a full sized skiff.
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