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Boostbros gave a pretty good description of how the noise changes with rpm..

At idle (usually 45% to 70% rpm depending on the model) most gas turbine engines have a high-pitch whine that can be...

I kept a pretty low profile during my build (it took over three years in my backyard) but stuck with it and now we have a blast every time we go out running through the San Juan Islands in NW...