prop question

Joined
Mar 4, 2008
Messages
69
what about the prop gives the boat its "torque" the get up and go from the stop the size or the angle? in numbers "high low" what is better for more torque
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
71,148
Re: prop question

Ayuh,....

The Idea is to find the Happy Medium,.....
But,.....

To get a boat to Jump out of the water,....
A Lower Pitched prop is the answer,..
You just have to be Careful you Don't exceed the allowed RPMs of your motor,....
'Cause it Will get there......

I Donno if that answers your question or not,.....
 

rndn

Commander
Joined
May 20, 2007
Messages
2,323
Re: prop question

The lower the pitch, the better the hole shot. If you go too low you can over rev your engine and blow it. If you over pitch too much you can lug your engine and cause an early death. Picture taking off on a 10 speed bike in 10th gear, no good right. Picture taking off in first gear and then trying to go 20mph while still in first gear, no good. The correct prop is the happy spot in between those 2 extremes where you can still take off but still reach the correct operating wide open throttle rpm's. If you find the correct prop and still have problems taking off you could always add smart tabs.
 

steelespike

Supreme Mariner
Joined
Apr 26, 2002
Messages
19,069
Re: prop question

Prop size is given in inches diameter X pitch.While there are subtle features of a prop that inhance performance the main feature is the pitch. Example, 13 X 13 Diameter is a product of the design, pitch determines the performance.
13 inches pitch is the number of inches the prop moves through the water in one revolution assuming no slip.Lower number better hole shot, higher number more speed assuming you stay with the rpm range of the motor.
 
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