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Dec 30th, 2023
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 Prop Pitch ???
#11832981
09/16/16 11:46 PM
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Joined: Jun 2014
Posts: 1,895
DBFishing83
OP
Extreme Angler
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OP
Extreme Angler
Joined: Jun 2014
Posts: 1,895 |
currently running a 25-M on my Yamaha ProV 066 150hp
what will happen with performance if I install a 27-M SS prop ?
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Re: Prop Pitch ???
[Re: DBFishing83]
#11833377
09/17/16 03:34 AM
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Joined: May 2013
Posts: 231
KC_Fisher
Outdoorsman
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Outdoorsman
Joined: May 2013
Posts: 231 |
066 150hp? 25m is probably too big, might try a 23. I can't see you spinning a 27 with the 150 unless you've got a 16' alison.
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Re: Prop Pitch ???
[Re: DBFishing83]
#11833394
09/17/16 03:46 AM
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Joined: Feb 2006
Posts: 3,769
bronco71
TFF Team Angler
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TFF Team Angler
Joined: Feb 2006
Posts: 3,769 |
I would think holeshot would be terrible with a 27p if it would even get on plane....
1987 Nitro MX185/Mercury Black Max 150
1999 Triton TX21/225 Mercury Optimax
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Re: Prop Pitch ???
[Re: DBFishing83]
#11833482
09/17/16 08:29 AM
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Joined: Jun 2014
Posts: 1,895
DBFishing83
OP
Extreme Angler
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OP
Extreme Angler
Joined: Jun 2014
Posts: 1,895 |
The 25-M works just fine.....
great hole shot even with boat full of everything
top speed 67,,,,cruises at 55.
just saw a deal on the 27-M
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Re: Prop Pitch ???
[Re: DBFishing83]
#11834000
09/17/16 07:07 PM
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Joined: Feb 2006
Posts: 3,769
bronco71
TFF Team Angler
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TFF Team Angler
Joined: Feb 2006
Posts: 3,769 |
what is your rpm at 67 with the 25M? if you are at or over the max rated rpm for your motor you might try the 27M, it will lower your WOT rpm by about 200rpm and increase speed (provided it has the power to spin it) while it will hurt your holeshot.....
1987 Nitro MX185/Mercury Black Max 150
1999 Triton TX21/225 Mercury Optimax
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Re: Prop Pitch ???
[Re: DBFishing83]
#11835909
09/18/16 10:41 PM
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Joined: Dec 2015
Posts: 731
toofy
Pro Angler
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Pro Angler
Joined: Dec 2015
Posts: 731 |
Can someone tell me the factors of a propeller that affect hole shot, top speed, top RPM, ability to get on plane, etc as mentioned here? I'm looking at getting a new one since my factory prop on my 225 Yamaha HDPI is banged up.
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Re: Prop Pitch ???
[Re: DBFishing83]
#11836737
09/19/16 01:55 PM
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Joined: Jan 2005
Posts: 16,929
Pat Goff
TFF Guru
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TFF Guru
Joined: Jan 2005
Posts: 16,929 |
Just like gears in your car. Sorta...
The pitch number is the number of inches forward the prop will go in one revolution.
Now from there it gets really complicated, diameter, rake, cup, blade design ALL make a difference. And, what runs right on my hull could be totally wrong on yours.
There's some very good experience here, so if you want a good answer, ask the right question:
What exactly you're running now, with details: rpms/speed/lift/holeshot time, the more you give the better you'll get.
Pat Goff Seadrift TX ![[Linked Image]](https://i.ibb.co/X48Kbbq/scooter-shallow.jpg)
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Re: Prop Pitch ???
[Re: DBFishing83]
#11837472
09/19/16 07:40 PM
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Joined: Aug 2006
Posts: 7,182
steve@S2Marine
TFF Celebrity
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TFF Celebrity
Joined: Aug 2006
Posts: 7,182 |
27p vs the 25p will drop 400 rpms at w.o.t.
if all the blades on both props are identical.
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