3 Blade vs 4 Blade props

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Fewer blades = more efficiency

More blades = better power loading

More blades = less efficiency

Larger disc size = better power loading

Larger disc size = faster tip speeds = lower efficiency

Propellers are undoubtedly the most complicated piece of engineering on an aircraft. Just bought a new McCauley for the family airplane. Not Cheap trust me....

McCauley Propeller Systems

You can also bet that all the engineers during WWII did their homework. I know Mtt and Focke Wulf both tested 4 bladed designs on their aircraft. It was found that what one design made up in efficiency, it lost in power loading and vice versa. As such Focke Wulf concluded that was no appreciable difference other than weight savings on the 3 bladed propeller.

Of course Tony's assertion is an added benefit!

All the best,

Crumpp
 

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