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1 vote

Turbocharged vs Turboprop cruise altitudes

As discussed here, piston engines are more efficient from a strictly power based comparison. Since you ask a slightly more specific question lets look at some operational numbers. Turbo Charged and ...
Dave's user avatar
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1 vote

Why weren't WWII piston aircraft able to fly at 500mph?

Another effect which must be considered is that when the vector-resolved airspeed at the tip of a propeller blade which is spinning and translating through the air gets close to mach 1, the drag force ...
niels nielsen's user avatar
8 votes

Why weren't WWII piston aircraft able to fly at 500mph?

What am I missing? The contribution of zero lift drag to overall drag at high speed. L/D drops to much lower values than 10 at the top speed of piston-powered airplanes. Let's take an example: Given ...
Peter Kämpf's user avatar
6 votes

Why weren't WWII piston aircraft able to fly at 500mph?

What am I missing? The historical and technological development. Let's start with the historical one. The benefits of a swept wing had already been known at least since 1935 when A. Büsemann ...
sophit's user avatar
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4 votes
Accepted

What is the general operating temperature of Free Piston Turbine Engines?

For a 20 kW engine with a 20 L tank and a bore of about 10 cm, the tank's temperature should be about 300 K (isothermal) to 400 K (adiabatic, more practically), says p. 11 of an analysis by Sandia ...
Camille Goudeseune's user avatar
4 votes

What is the general operating temperature of Free Piston Turbine Engines?

Any sort of heat cycle engine (Brayton - gas turbine, Otto - gasoline engine, Diesel, Carnot, etc) will have peak efficiency and power output with a higher peak temperature. Consequently, all of these ...
Rob McDonald's user avatar
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