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12 km per hour

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Q: How fast does a propeller need to spin to move airplane?
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How many RPM does an airplane need?

It depends on the type and weight of aircraft, power of engine and type of propeller.


Why do you need the airplane to travel?

Because it fast and relaxing way to traver


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A rubber band boat works much like a rubber band airplane. First you need to build the boat itself. Then you need to make a propeller. The propeller shaft needs to run through the inside of the boat, not below the boat. With the prop below the water. The propeller shaft should not go the full length of the boat. About halfway through put a loop in the shaft. Then to the front of the boat attach a rubber band. Then run the rubber band through the loop in propeller shaft. Now twist the prop and the rubber band should twist around and around. When it's good and tight let go and the propeller should spin. Allowing the boat to move forward in the water. Mind you the shaft needs to be a thin piece of metal, as it will be difficult to make it water tight.


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A motorcycle engine can be converted to power an airplane if the aircraft is registered and placarded as an experimental aircraft. They can't be installed in a certified plane without FAA inspection and approval. Engines such as a 2-cylinder, horizontally opposed BMW motor need a PSRU, or propeller speed reduction unit, to reduce the engine's RPM to match the propeller's RPM.


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