07 Glastron 185, 3.0L volvo. Stock prop is aluminum 14 1/4 x 21. Just want to bounce my knowledge off the experts!
So after all the reading here I am guessing that it's 14 1/4 diameter, 21 pitch.
If I go to a 20 pitch, rpm's go up by about 250rpm.
If I go 4 blade, I have to drop 1" diameter, so about 13" x 21 and I'll lose a couple mph at the top end (?).
Desired result: Have a prop to put on when the boat had 4 people and a tuber or skiier. Achieve 30mph without going above 4k rpms, i.e. not close to wot.
With 2 small people, a dog and full tank I'm currently hitting about 30mph around 3,200 rpm. From a stop, WOT gets me 3500rpm until on plane, and then it's 4500 @ about 45mph. 30mph is comfortable and plenty fast enough for me in usual choppy conditions (average saturday afternoon lake with light wind). With 4 people and a full tank, I'm at about 41mph at 4500rpm.
Question: Will I be happy with a 3 blade 14 1/4 x 20 for hole shots or should I go 4 blade 13x21...or 4 blade 13x20? Or go to a 19pitch 3 blade? Thoughts are appreciated!
So after all the reading here I am guessing that it's 14 1/4 diameter, 21 pitch.
If I go to a 20 pitch, rpm's go up by about 250rpm.
If I go 4 blade, I have to drop 1" diameter, so about 13" x 21 and I'll lose a couple mph at the top end (?).
Desired result: Have a prop to put on when the boat had 4 people and a tuber or skiier. Achieve 30mph without going above 4k rpms, i.e. not close to wot.
With 2 small people, a dog and full tank I'm currently hitting about 30mph around 3,200 rpm. From a stop, WOT gets me 3500rpm until on plane, and then it's 4500 @ about 45mph. 30mph is comfortable and plenty fast enough for me in usual choppy conditions (average saturday afternoon lake with light wind). With 4 people and a full tank, I'm at about 41mph at 4500rpm.
Question: Will I be happy with a 3 blade 14 1/4 x 20 for hole shots or should I go 4 blade 13x21...or 4 blade 13x20? Or go to a 19pitch 3 blade? Thoughts are appreciated!
