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Max Online: 36273 @ 01/23/13 02:34 PM
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#11832981 - 09/16/16 06:46 PM Prop Pitch ???
flukeman83 Offline
Outdoorsman

Registered: 06/19/14
Posts: 155
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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#11833377 - 09/16/16 10:34 PM Re: Prop Pitch ??? [Re: flukeman83]
KC_Fisher Offline
Outdoorsman

Registered: 05/20/13
Posts: 210
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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#11833394 - 09/16/16 10:46 PM Re: Prop Pitch ??? [Re: flukeman83]
bronco71 Offline
Extreme Angler

Registered: 02/05/06
Posts: 1049
Loc: Farmers Branch/Sulphur Bluff
I would think holeshot would be terrible with a 27p if it would even get on plane....

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#11833482 - 09/17/16 03:29 AM Re: Prop Pitch ??? [Re: flukeman83]
flukeman83 Offline
Outdoorsman

Registered: 06/19/14
Posts: 155
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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#11834000 - 09/17/16 02:07 PM Re: Prop Pitch ??? [Re: flukeman83]
bronco71 Offline
Extreme Angler

Registered: 02/05/06
Posts: 1049
Loc: Farmers Branch/Sulphur Bluff
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.....

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#11835909 - 09/18/16 05:41 PM Re: Prop Pitch ??? [Re: flukeman83]
toofy Online   content
Angler

Registered: 12/26/15
Posts: 252
Loc: Fort Worth
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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#11836737 - 09/19/16 08:55 AM Re: Prop Pitch ??? [Re: flukeman83]
Pat Goff Offline
TFF Team Angler

Registered: 01/29/05
Posts: 4991
Loc: Marble Falls/Seadrift
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
Marble Falls/Seadrift TX

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#11837472 - 09/19/16 02:40 PM Re: Prop Pitch ??? [Re: flukeman83]
steve@scp Offline
TFF Celebrity

Registered: 08/25/06
Posts: 6628
Loc: Quitman,Tx
27p vs the 25p will drop 400 rpms at w.o.t.
if all the blades on both props are identical.
_________________________
www.hydrodynamics-usa.com
903-763-5225





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