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Formula for 4 blade prop

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blane.c

Almost Human
Supporting Member
Joined
Jun 27, 2015
Messages
6,595
Location
PIERMONT NH
Ramer's formula's for 2 blade prop D=1.83x the cube root of the BHP and for 3 blade prop D=1.5x the cube rot of the BHP, what is the multiplier for a 4 blade prop?

Also Ramer has formula for tip speed but I see no formula for propeller pitch?

Thank you.
 
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