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Dec 30th, 2023
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 RPM to high & low mph
#10931522
06/21/15 06:30 PM
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Joined: Jun 2015
Posts: 15
NP15
OP
Green Horn
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OP
Green Horn
Joined: Jun 2015
Posts: 15 |
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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Re: RPM to high & low mph
[Re: NP15]
#10931579
06/21/15 07:22 PM
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Joined: Dec 2009
Posts: 466
standalone
Angler
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Angler
Joined: Dec 2009
Posts: 466 |
You might want to check and see if the prop hub is bad.
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Re: RPM to high & low mph
[Re: NP15]
#10931611
06/21/15 07:54 PM
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Joined: Jun 2015
Posts: 15
NP15
OP
Green Horn
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OP
Green Horn
Joined: Jun 2015
Posts: 15 |
its brand new prop hub...that's why it look's to me wired
tnx for you reply
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Re: RPM to high & low mph
[Re: NP15]
#10931614
06/21/15 07:56 PM
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Joined: Nov 2012
Posts: 806
JimmyP
Pro Angler
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Pro Angler
Joined: Nov 2012
Posts: 806 |
Call Steve at Steve's Custom Props. Great guy and he can answer all your questions.
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Re: RPM to high & low mph
[Re: NP15]
#10931624
06/21/15 08:16 PM
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Joined: Jun 2015
Posts: 15
NP15
OP
Green Horn
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OP
Green Horn
Joined: Jun 2015
Posts: 15 |
OK I will... Tnx. for your help...
any one has this issue?
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Re: RPM to high & low mph
[Re: NP15]
#10931894
06/22/15 12:29 AM
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Joined: Jun 2003
Posts: 2,723
petro
Extreme Angler
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Extreme Angler
Joined: Jun 2003
Posts: 2,723 |
Higher pitch prop. Go with the 23. See if you can test one out
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Re: RPM to high & low mph
[Re: NP15]
#10932351
06/22/15 12:50 PM
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Joined: May 2003
Posts: 11,586
gary purdy
TFF Guru
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TFF Guru
Joined: May 2003
Posts: 11,586 |
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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Re: RPM to high & low mph
[Re: NP15]
#10933176
06/22/15 06:45 PM
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Joined: Jun 2015
Posts: 15
NP15
OP
Green Horn
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OP
Green Horn
Joined: Jun 2015
Posts: 15 |
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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