Is a prop slip of 7-8% realistic?
10-05-2017, 07:29 PM
#12
21 and 42 footers
Platinum Member
10-05-2017, 08:15 PM
#14
21 and 42 footers
Platinum Member
10-05-2017, 11:44 PM
#15
Sometimes slip numbers are wrong.
example:
I switch from one 25 to another.
my slip numbers go down from say 13 percent to 9 percent.Looks good on paper but if my new prop actually has 26 instead of 25.Or my old one was actually 24 instead of the 25 it said then my slip numbers are almost identical to my old prop.
example:
I switch from one 25 to another.
my slip numbers go down from say 13 percent to 9 percent.Looks good on paper but if my new prop actually has 26 instead of 25.Or my old one was actually 24 instead of the 25 it said then my slip numbers are almost identical to my old prop.
10-05-2017, 11:51 PM
#16
Is a prop slip of 7-8% realistic?
We recently tried a new prop and got significantly better performance.
Our previous props were producing 16-19% slip (24 and 26 Bravo I props. 24, 26, and 27 Hydro props)
Then we tested a 21 Pitch Revolution 4 prop, 7% slip!
It is such a dramatic difference, I have to question the results.
Boat details:
1993 26' Velocity
Bravo XR 1.5:1
new 21 Pitch Revolution 4 (LH)
new tach 5700 rpm
2 independent gps showing 70 mph
We recently tried a new prop and got significantly better performance.
Our previous props were producing 16-19% slip (24 and 26 Bravo I props. 24, 26, and 27 Hydro props)
Then we tested a 21 Pitch Revolution 4 prop, 7% slip!
It is such a dramatic difference, I have to question the results.
Boat details:
1993 26' Velocity
Bravo XR 1.5:1
new 21 Pitch Revolution 4 (LH)
new tach 5700 rpm
2 independent gps showing 70 mph
Remember slip is not constant, but varies greatly through out the RPM band. At idle to before on plane slip is typically 30-50% or more. Trim angle will also impact slip. Get a prop that performs the best with the hull, reaches the motors appropriate power band and has minimum slip.
