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Max Online: 36273 @ 01/23/13 02:34 PM
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#12430009 - 09/17/17 11:39 AM Help with selecting boat prop
Canny Offline
Outdoorsman

Registered: 04/18/10
Posts: 60
Loc: Lufkin, TX
I recently acquired a 2007 Nitro 591 with a 150efi. Total of 75 hours on boat and motor. Motor was checked and everything is firing like it should. It came with a Tempest 21p. It had a hard time getting on plane but when it did it would run like a scalded ape. I had the largest PVS plugs in the prop but it just wasn't spinning up fast enough to get on plane and would hold only 4800-5000 RPMs at WOT. I tried a 13.5" Laser 2 24p that a friend of had laying around. The laser spun up great, but would cavitate at about 5000 RPMs when getting on plane. I would say that despite the cavitation the hole shot was improved over the Tempest due to the RPMs. Once on plane WOT was about 5600 - 5800 RPMs but top speed was only about 54 mph vs 63 with the Tempest. Trying to figure out what type of prop I need. I'm thinking something like the trophy plus since it's smaller than the Tempest, but with the PVS plugs I can adjust how much the water is aerated around the prop to control cavitation.

Tempest
4800 - 5000 RPMs WOT
63 MPH

Laser 2
5600-5800 RPMs WOT
54 MPH
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#12430026 - 09/17/17 12:06 PM Re: Help with selecting boat prop [Re: Canny]
bronco71 Online   content
Extreme Angler

Registered: 02/05/06
Posts: 1371
Loc: Farmers Branch/Sulphur Bluff
Those numbers don't look right, a 21p should be red lining on that motor!

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#12430044 - 09/17/17 12:23 PM Re: Help with selecting boat prop [Re: Canny]
Curtbass Online   content
Extreme Angler

Registered: 04/17/15
Posts: 1120
Loc: Grand Prairie, Tx
Try removing plugs completely, 1 at a time & test each time you make a change. It may improve holeshot but still should be more rpms at WOT as plugs have no effect on upper end.


Edited by Curtbass (09/17/17 01:33 PM)
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'98 Tr20 Triton completly updated & rigged, 05 Magnum c-channeltrailer
'94 Merc 200Xri completly rebuilt & noseconed/low water pickup lower unit.
92' ChampioN 201DCR Elite repower in progress.

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#12430047 - 09/17/17 12:25 PM Re: Help with selecting boat prop [Re: Curtbass]
Canny Offline
Outdoorsman

Registered: 04/18/10
Posts: 60
Loc: Lufkin, TX
I took one out of my Tempest and it cavitated pretty bad on take off
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#12430049 - 09/17/17 12:26 PM Re: Help with selecting boat prop [Re: bronco71]
Canny Offline
Outdoorsman

Registered: 04/18/10
Posts: 60
Loc: Lufkin, TX
I think it's more prop dia than pitch. The Tempest is a 14 5/8" prop so it's larger and has more mass to get spinning
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#12430069 - 09/17/17 12:51 PM Re: Help with selecting boat prop [Re: Canny]
bronco71 Online   content
Extreme Angler

Registered: 02/05/06
Posts: 1371
Loc: Farmers Branch/Sulphur Bluff
Originally Posted By: Canny
I think it's more prop dia than pitch. The Tempest is a 14 5/8" prop so it's larger and has more mass to get spinning

I have an old 1979 carbed 150 Black Max on a 18.5 foot Nitro that will turn a 14 1/2" 21P prop at 6000 rpm with a great holeshot but won't get on plane with a 24P Laser 2.A 23P Tempest Plus is a bit too much for it, bad holeshot and 5200 rpm WOT. Turns a large diameter 19P prop at 6300 WOT, that is why I questioned the 21P Tempest numbers....

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#12430082 - 09/17/17 01:01 PM Re: Help with selecting boat prop [Re: bronco71]
Canny Offline
Outdoorsman

Registered: 04/18/10
Posts: 60
Loc: Lufkin, TX
Thanks for clarifying, it may as well be something else going on.
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#12435857 - 09/21/17 02:41 PM Re: Help with selecting boat prop [Re: Canny]
Muzzlebrake Offline
Extreme Angler

Registered: 12/26/14
Posts: 1577
Loc: Euless
I went from Tempest Plus 23P to a Trophy Plus 4 blade 21P and have 3X better hole shot and may have picked up 1-2 mph. Max RPM is the same @5600. Tracker Avalanche 18DC 150 EFI Merc. Mid range acceleration with the Trophy 21P is lots quicker and will run on pad at 10mph slower the the Tempest 23P


Edited by Muzzlebrake (09/21/17 02:43 PM)
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