I am not the type of encyclopedic guy that carries data in his storage. I am the kind of guy that carries concepts.
I know that pressurization is just to keep the cabin at a higher pressure than the surrounding atmosphere. It is not an "engine" thing (while, unless you have a totally air-tight cabin, you need a source of pressurized air to keep the cabin pressurized).
I know that there are pressurized no-engine airplanes (gliders). (new challenge?, I think the Germans are also involved here)
I know in my life I came across (in books or magazines) pressurized piston-engine planes that were not turbocharged (that has nothing to do with turboprop).
I don't remember which one(s), but I do know that a turbocharged piston engine is not a prerequisite for pressurization in a piston-engine plane.
I know that, most of the time, when a manufacturer makes a pressurized version of an existing piston-engine plane they take advantage of turbo engines (not turboprops) because of a number of reasons: 1st naturally a plane with a turbocharged piston engine can reach higher than its twin with an engine of the same power but not turbocharged, the reason being that the turbocharged engines with the same power at sea level can give more power at high altitude, and it is in an airplane capable to fly higher where pressurization is a stronger selling point. 2nd, the turbo provides a source of pressurization that is readily available: the air intake, which is pressurized by the turbocharged at above local atmospheric pressure.
But I also know that there are engine-driven compressors designed specifically for pressurization, which are powered directly by the engine shaft either via a belt or a gear. If these things exist (and they do), then there must have been airplanes using it. Which ones? I don't remember.
So I am happy that you solved the challenge yourself, because you would have been waiting forever for my answer.
I know that pressurization is just to keep the cabin at a higher pressure than the surrounding atmosphere. It is not an "engine" thing (while, unless you have a totally air-tight cabin, you need a source of pressurized air to keep the cabin pressurized).
I know that there are pressurized no-engine airplanes (gliders). (new challenge?, I think the Germans are also involved here)
I know in my life I came across (in books or magazines) pressurized piston-engine planes that were not turbocharged (that has nothing to do with turboprop).
I don't remember which one(s), but I do know that a turbocharged piston engine is not a prerequisite for pressurization in a piston-engine plane.
I know that, most of the time, when a manufacturer makes a pressurized version of an existing piston-engine plane they take advantage of turbo engines (not turboprops) because of a number of reasons: 1st naturally a plane with a turbocharged piston engine can reach higher than its twin with an engine of the same power but not turbocharged, the reason being that the turbocharged engines with the same power at sea level can give more power at high altitude, and it is in an airplane capable to fly higher where pressurization is a stronger selling point. 2nd, the turbo provides a source of pressurization that is readily available: the air intake, which is pressurized by the turbocharged at above local atmospheric pressure.
But I also know that there are engine-driven compressors designed specifically for pressurization, which are powered directly by the engine shaft either via a belt or a gear. If these things exist (and they do), then there must have been airplanes using it. Which ones? I don't remember.
So I am happy that you solved the challenge yourself, because you would have been waiting forever for my answer.
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