How fast are propeller planes?

Answer 1

a typical small airplane such as a Cessna 310 tops out at 200 mph depending on density altitude and a variety of other factors. From the general aviation 310s and up are many "bigger and better" until you get to the B29 Superfortress which will true at 350+/- . Many small, specialty airplanes such as racers will go even faster.

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some high performance racers can exceed 600 mph in level flight and in a dive can hit the speed of sound but if they do they would probably break apart from harmonic vibration - at the Reno Nevada air races the unlimited prop class routinely break 500 mph - these racers are mostly converted WW2 era fighters or copies of the fighters, which are specially designed and built to fly that fast without ripping apart - most prop aircraft cannot be flown that fast or they start vibrations that will tear them apart

most prop aircraft are not designed to fly faster than about 350 mph because props loose their effiecency above that airspeed and take too much fuel/power to operate effectively - jet engines start being effeicint at about 300 mph so aircraft that routinely fly faster than 300 to 350 mph are usually powered with jets - that's also why props will probably be around for a long time yet is they are way more efficient at low speed than jets

turbo props are a compromise as they are a jet engine with a propellor attached to the central shaft of the turbine creating a powerful engine that is very efficient in the middle range of about 200 to 400 mph

Answer 2

in level flight: around 600,

in a dive prop planes can exceed the sound barrier.