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Max Online: 36273 @ 01/23/13 02:34 PM
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#10931522 - 06/21/15 01:30 PM RPM to high & low mph
NP15 Offline
Green Horn

Registered: 06/19/15
Posts: 8
Loc: MEXICO
Hi I have a nitro 750 2007 w 90 hp, my current prop it's a Michigan vortex 12.75 x 21p alumnium
and I run the boat in WOT. @ 6400rpm an reach 39 to 40mph
i think its to high rpm and to slow for top speed....
I make the exercise in the web site of mercury marine (prop selector) and says I need to change the prop
for a lazer 2 13.3/4 x 23P or trophy plus 13.3/4 x 23P or 24P
do you think its real?
or what I need to do to get overall well performance?

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#10931579 - 06/21/15 02:22 PM Re: RPM to high & low mph [Re: NP15]
standalone Offline
Angler

Registered: 12/06/09
Posts: 463
Loc: South of Oklahoma - North of M...
You might want to check and see if the prop hub is bad.

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#10931611 - 06/21/15 02:54 PM Re: RPM to high & low mph [Re: NP15]
NP15 Offline
Green Horn

Registered: 06/19/15
Posts: 8
Loc: MEXICO
its brand new prop hub...that's why it look's to me wired
tnx for you reply

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#10931614 - 06/21/15 02:56 PM Re: RPM to high & low mph [Re: NP15]
JimmyP Offline
Pro Angler

Registered: 11/26/12
Posts: 806
Loc: Waxahachie, Texas
Call Steve at Steve's Custom Props. Great guy and he can answer all your questions.

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#10931624 - 06/21/15 03:16 PM Re: RPM to high & low mph [Re: NP15]
NP15 Offline
Green Horn

Registered: 06/19/15
Posts: 8
Loc: MEXICO
OK I will... Tnx. for your help...
any one has this issue?

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#10931894 - 06/21/15 07:29 PM Re: RPM to high & low mph [Re: NP15]
petro Online   content
Extreme Angler

Registered: 06/13/03
Posts: 2240
Loc: Alvin, TX
Higher pitch prop. Go with the 23. See if you can test one out

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#10932351 - 06/22/15 07:50 AM Re: RPM to high & low mph [Re: NP15]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 10850
Loc: Littlefield Tx & Lake A. H. US...
I do not think you need to change a lot. I would try a 13 3/4in. 21 pitch first. The diameter is pretty small on your 21.
_________________________
“The world will not be destroyed by those who do evil, but by those who watch them without doing anything” GOD IS GOOD

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#10933176 - 06/22/15 01:45 PM Re: RPM to high & low mph [Re: NP15]
NP15 Offline
Green Horn

Registered: 06/19/15
Posts: 8
Loc: MEXICO
ok ..I try for a biger prop and the same pitch
and then will see if it's better a high pitch
tankyou for your help

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