ORIGINAL: JollyPopper
A lawn mower won't start without a blade on it. I doubt you could start an RC engine without a prop. Has anyone tried?[
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Not at all true. Lawn mower engines have a built-in flywheel (and governor) and will run just fine without a blade. Nearly all lawn tractors start and run with the blades disengaged. RC engines will indeed run without a prop but, as pointed out, they will not run long.