I would be interested in know how the noise of different prop lengths and designs varies by the prop speed.
Sorry if this is a newbie question.
Thanks,
James
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I would be interested in know how the noise of different prop lengths and designs varies by the prop speed.
Sorry if this is a newbie question.
Thanks,
James
This reply was deleted.
Replies
in most cases a longer fatter slower turning club makes less noise.
The noise from the prop can come from multipule things but the two that I notice most are just from the turblance caused by the blade. So a slower turning(may need a gearbox) larger diameter prop normaly makes less noise.
On our AT-301 air tractors we went from a plane that could be heard over 7 miles away at takeoff to one that can only be heard at 3, and we could now hear the engine over the prop.
We did this by incresing the prop length by ~10% going to 3 blades and dropping the RPM by 50%