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Old 11-10-2006, 08:42 PM   #1
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Fletcher-Andi's Avatar
Country: hamburg , germany
Occupation: electronics
Interests: boating, audio , PC
Boat make: Fletcher Arrowshaft 199
Engines: Yamaha 225
Cruising area: baltic sea

Join Date: Dec 2005
Posts: 115
3 blade / 4 blade / 5 blade props


I have a question regarding the differences between a 3 , 4 and 5 blade prop!

If i will have 3 props of 20" pitch and a diameter of 13" , does somebody know what will happen to the RPMs??

how will the 4 and 5 blade props perform compared to the 3 blader?

I know , the more blades , the more acceleration you have , but less top end speed!

For example : i drive a 20" prop , 3 blade to 50 mph @ 5800 rpm.
What will be the result with a 4 blader and with a 5 blader if the diameter will be the same?

Is there a higher propslip with more blades?

Thanks in advance!

Best regards!
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