I don&#x27;t think that turbine engines are the model of efficiency that you claim. On a BSFC basis, they&#x27;re significantly worse than piston diesels or marine two-strokes. <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Brake_specific_fuel_consumption#Examples_of_values_of_BSFC_for_shaft_engines" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Brake_specific_fuel_consumptio...</a><p>(That&#x27;s for shaft engines, which a turbojet isn&#x27;t, but the turboprop examples are jet engines with a gearbox and propellor mounted.) Jet engines are incredibly powerful (per unit of mass) and reliable, but I don&#x27;t think they&#x27;re incredibly efficient.