AusCan
Guru
- Joined
- Jul 15, 2012
- Messages
- 3,218
- Location
- Australia
- Vessel Name
- Kokanee
- Vessel Make
- Cuddles 30 Pilot House Motor Sailer
I've calculated my boat's prop slip factor, (the % difference between prop theoretical speed and actual speed), and it ranges from 33% at low rpm to 50% at WOT.
I'm just wondering how this compared to other full displacement boats.
I've read that many planing boats have a slip factor of around 10%, and it surprised me that mine was so much higher.
Have any other full displacement boat owners done these calcs for their boat?
To calculate theoretical speed in knots:
Prop pitch x rpm
Gear ratio x 1215
To calculate slip factor:
Theoretical speed - Actual Speed
Theoretical Speed
I'm just wondering how this compared to other full displacement boats.
I've read that many planing boats have a slip factor of around 10%, and it surprised me that mine was so much higher.
Have any other full displacement boat owners done these calcs for their boat?
To calculate theoretical speed in knots:
Prop pitch x rpm
Gear ratio x 1215
To calculate slip factor:
Theoretical speed - Actual Speed
Theoretical Speed
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