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Prop info #2109750
05/09/17 03:53 AM
05/09/17 03:53 AM
Joined: Dec 2003
Posts: 9,713
Cleburne
.308 Offline OP
14 point
.308  Offline OP
14 point
Joined: Dec 2003
Posts: 9,713
Cleburne
To those who understands props, I have an old bass boat with an 80hp mercury (1980s model). The boat had always struggled to get up on plane. It has a 3 blade prop with the #'s 48 72500 a4 21p. What prop could I put on it to make it jump up on plane better? I care nothing about speed, if the boat is running fast enough to blow my hat off its running too fast.


"When you've stared down the barrel of a shotgun in your own home, 3rd & 20 don't seem too bad"......Ken "Snake" Stabler
Re: Prop info [Re: .308] #2109780
05/09/17 04:16 AM
05/09/17 04:16 AM
Joined: Dec 2001
Posts: 13,909
AL
H
hunterbuck Offline
Booner
hunterbuck  Offline
Booner
H
Joined: Dec 2001
Posts: 13,909
AL
It's a 21 pitch prop, so you can go down in pitch to help with your hole shot. Try something in a 19p.


"You think I care? Roll Damn Tide"

Have you tried Google?
Re: Prop info [Re: .308] #2109797
05/09/17 04:35 AM
05/09/17 04:35 AM
Joined: Dec 2003
Posts: 9,713
Cleburne
.308 Offline OP
14 point
.308  Offline OP
14 point
Joined: Dec 2003
Posts: 9,713
Cleburne
Ok, I wasn't sure if I needed to go up or down. Would a 4 blade help?


"When you've stared down the barrel of a shotgun in your own home, 3rd & 20 don't seem too bad"......Ken "Snake" Stabler
Re: Prop info [Re: .308] #2109833
05/09/17 05:07 AM
05/09/17 05:07 AM
Joined: Nov 2014
Posts: 1,787
Cullman
Z
Zkd22 Offline
8 point
Zkd22  Offline
8 point
Z
Joined: Nov 2014
Posts: 1,787
Cullman
4 blade will help hole shot but will hurt you on the top end

Re: Prop info [Re: hunterbuck] #2110482
05/09/17 04:44 PM
05/09/17 04:44 PM
Joined: Jun 2013
Posts: 52,227
Gee's Bend/At The Hog Pen
James Offline
Freak of Nature
James  Offline
Freak of Nature
Joined: Jun 2013
Posts: 52,227
Gee's Bend/At The Hog Pen

Originally Posted By: hunterbuck
It's a 21 pitch prop, so you can go down in pitch to help with your hole shot. Try something in a 19p.



Do not regret growing older, it's a privilege denied to many!

Re: Prop info [Re: .308] #2110491
05/09/17 04:52 PM
05/09/17 04:52 PM
Joined: Apr 2015
Posts: 7,827
North Alabama
Hevishot13 Offline
14 point
Hevishot13  Offline
14 point
Joined: Apr 2015
Posts: 7,827
North Alabama
A 21 pitch on a old 80 hp? Damn what kind of boat is it on?

Re: Prop info [Re: .308] #2110538
05/09/17 06:41 PM
05/09/17 06:41 PM
Joined: Oct 2010
Posts: 4,753
haleyville al,
D
dnolen Offline
10 point
dnolen  Offline
10 point
D
Joined: Oct 2010
Posts: 4,753
haleyville al,
If it's something like a bass tracker it may not be the prop. Our tracker had issues getting on plane the foam in the back was soaked. After awhile that foam is like a sponge.

Re: Prop info [Re: .308] #2110547
05/09/17 11:14 PM
05/09/17 11:14 PM
Joined: Dec 2003
Posts: 9,713
Cleburne
.308 Offline OP
14 point
.308  Offline OP
14 point
Joined: Dec 2003
Posts: 9,713
Cleburne
It's a mid 80's 15' Bumble Bee. What Pitch should it have? The motor was rebuilt a few years ago using a 90hp block so I guess it is now a 90.

Last edited by .308; 05/09/17 11:16 PM.

"When you've stared down the barrel of a shotgun in your own home, 3rd & 20 don't seem too bad"......Ken "Snake" Stabler
Re: Prop info [Re: .308] #2110569
05/10/17 01:08 AM
05/10/17 01:08 AM
Joined: Apr 2015
Posts: 7,827
North Alabama
Hevishot13 Offline
14 point
Hevishot13  Offline
14 point
Joined: Apr 2015
Posts: 7,827
North Alabama
How many rpms is the motor turning? I'd think you need more like a 15 or 17 but depending on boat weight you may could swing more

Re: Prop info [Re: .308] #2110605
05/10/17 02:19 AM
05/10/17 02:19 AM
Joined: Dec 2003
Posts: 9,713
Cleburne
.308 Offline OP
14 point
.308  Offline OP
14 point
Joined: Dec 2003
Posts: 9,713
Cleburne
I don't have a clue on the rpms, it is an old heavy made fiberglass.


"When you've stared down the barrel of a shotgun in your own home, 3rd & 20 don't seem too bad"......Ken "Snake" Stabler
Re: Prop info [Re: .308] #2110613
05/10/17 02:32 AM
05/10/17 02:32 AM
Joined: Apr 2015
Posts: 7,827
North Alabama
Hevishot13 Offline
14 point
Hevishot13  Offline
14 point
Joined: Apr 2015
Posts: 7,827
North Alabama
I bet your not turning very many rpms. I'd try a 15 or 17 and have a tach hooked up to watch rpms. The reason you can hardly plan off is that your prop is way too big.

Re: Prop info [Re: .308] #2111237
05/10/17 04:18 PM
05/10/17 04:18 PM
Joined: Jul 2007
Posts: 3,348
Monroe County, AL
skintback Offline
10 point
skintback  Offline
10 point
Joined: Jul 2007
Posts: 3,348
Monroe County, AL
21 is kind of tall for an 80hp. What RPm's does it turn when up and running wide open? I'm guessing your going to need around a 17 maybe a 15.


Anything worth doing, is worth doing right, or it's not worth doing at all!
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