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Re: [OM] IMB: TBM 850 at the Airport

Subject: Re: [OM] IMB: TBM 850 at the Airport
From: Jim Nichols <jhnichols@xxxxxxxxxxxxx>
Date: Fri, 30 Aug 2019 00:24:56 -0500
Mike,

A lot of research has gone into optimizing propeller design.  One problem has been dealing with tip speed.   If the tip speed goes supersonic, much of your energy goes into noise and tip losses. Hence, as horsepower goes up, the prop can't just get larger in diameter.  They try to hold the diameter small enough to avoid the tip losses while increasing the ability to absorb horsepower by optimizing the number and shape of the blades.

If you have ever heard a WWII North American AT-6 or Navy SN-J at an airshow, you probably have an idea of the sound of a propeller going supersonic.

Jim Nichols
Tullahoma, TN USA

On 8/29/2019 6:48 PM, Mike Gordon via olympus wrote:
Fuel burn related to all those blades on the prop?  I am no engineer but would 
seem efficiency would be down with each blade turning in the wake of the 
previous.
Probably a myriad of other variables that would not even know to think about 
but the number of blades strikes the lay person as unusual.

Mike
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