Steam powered aircraft engine works!!!!

In Tesla's time, the efficiency of conventional turbines was low because the aerodynamic theory to proper blade design didn't exist and the engineering materials of the time put severe limitations on operating speeds and temperatures. The efficiency of a conventional turbine is related to the difference in temperature between the intake and the exhaust. This requires that the materials used to construct it be able to withstand very high temperatures for reasonable efficiency.
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The turbine efficiency of the gas Tesla turbine is estimated to be above 60, reaching a maximum of 95 percent. Keep in mind that turbine efficiency is different to the cycle efficiency of the engine using the turbine. Axial turbines which operate today in steam plants or jet engines have efficiencies of about 80 - 95 %. This is different to the cycle efficiencies of the plant or engine which are between 30% and 40%, and are limited by any irreversibilities to be below the Carnot cycle efficiency. Tesla claimed that a steam version of his device would achieve around 95 percent efficiency.
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"With proper use of the analytical results, the rotor efficiency using laminar flow can be very high, even above 95%. However, in order to attain high rotor efficiency, the flowrate number must be made small which means high rotor efficiency is achieved at the expense of using a large number of disks and hence a physically larger rotor."

Actual modern multiple stage bladed turbines typically reach 60% - 70% efficiency. Actual volute-rotor matched Tesla-type machines of reasonable size with common fluids (steam, gas, and water) would also be expected to be around this range (if not higher).