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Prop info #2109750 05/09/17 03:53 AM 05/09/17 03:53 AM
Joined: Dec 2003 Posts: 9,712 Cleburne .308 OP 14 point
.308 OP 14 point Joined: Dec 2003 Posts: 9,712 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: 13,907 AL H hunterbuck Booner
hunterbuck Booner H Joined: Dec 2001 Posts: 13,907 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: 9,712 Cleburne .308 OP 14 point
.308 OP 14 point Joined: Dec 2003 Posts: 9,712 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 8 point
Zkd22 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: 52,200 Gee's Bend/At The Hog Pen James Freak of Nature
James Freak of Nature Joined: Jun 2013 Posts: 52,200 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. How many people am i willing to sacrifice for freedom? Everyone. All of them... 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: 7,823 North Alabama Hevishot13 14 point
Hevishot13 14 point Joined: Apr 2015 Posts: 7,823 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 10 point
dnolen 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: 9,712 Cleburne .308 OP 14 point
.308 OP 14 point Joined: Dec 2003 Posts: 9,712 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: 7,823 North Alabama Hevishot13 14 point
Hevishot13 14 point Joined: Apr 2015 Posts: 7,823 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: 9,712 Cleburne .308 OP 14 point
.308 OP 14 point Joined: Dec 2003 Posts: 9,712 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: 7,823 North Alabama Hevishot13 14 point
Hevishot13 14 point Joined: Apr 2015 Posts: 7,823 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 10 point
skintback 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! ------------------------------