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ACME 3680 NiBral Propeller 21RH25 2.00"
ACME 3680 21.00 RH 25.00" 3 Blade NiBral Cruiser Propeller
All ACME inboard Cruiser Propellers are cast in their own North American foundry and 100% CNC machined in one of their two QS-9000 manufacturing facilities.
Diameter: 21.00"
Pitch: 25.00"
Cup: .75"
Hub Length: 4.500"
Bore: 2.00"
Blades: 3
Rotation: Right
ACME Cupping estimates for engine load based on a gear ratio of 1.5:1 @ 2800 RPM.
0.000 = Same as design pitch
0.045 = adds 1” to design pitch
0.075 = adds 1-1/2” to design pitch
0.105 = adds 2” to design pitch
0.135 = adds 2-1/4” to design pitch
Example: If a blade design pitch is 24 + (.075 Cup) effective pitch is 25
NOTE: If ratios and max RPM’s change higher or lower, it will change data above slightly +/-.
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