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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: 15
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: 466
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: 15
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: 15
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 Offline
Extreme Angler

Registered: 06/13/03
Posts: 2278
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: 11320
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. Remember what He has done and remember that He is not done yet!-- 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: 15
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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