Turbine engines are great, but they aren't suited for low revs. Also they won't have the fuel economy and are most likely harder to make than a Wankel or Liquid Piston engine.
Wankel engines are a great intermediary between turbine and piston engines, but they have the problems with their apex seals wearing out. That brings us to the liquid piston engine, basically and inverted Wankel.
I wonder if these LP engines are easier to make than a piston engine and more simpler to put together. If there are no piston rings and valve system, that makes it much easier to assemble, less worries about the fuel gumming up anything, and overall lighter.
Less moving parts means less things to fail. Usually it also means less variation for inputs and outputs.
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