Main Menu
Advertisement
Affiliates
Advertisement
Newest Members
Gary Bowman, Msing48, mrdeath, Huizarr, guysgolf1
106531 Registered Users
Top Posters
TexDawg 87143
hopalong 78832
Pilothawk 75799
JDavis7873® 67386
John175 ® 65911
FattyMcButterpants 60793
Derek 🐝 59029
Tritonman 57766
LoneStarSon® 53822
SkeeterRonnie 53123
facebook
Forum Stats
106531 Members
61 Forums
814130 Topics
10280004 Posts

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

Registered: 04/18/10
Posts: 64
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
_________________________
Cross her eyes, and dot her T's

Top
#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: 1410
Loc: Farmers Branch/Sulphur Bluff
Those numbers don't look right, a 21p should be red lining on that motor!

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

Registered: 04/17/15
Posts: 1204
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)
_________________________
'98 Tr20 Triton
'94 Merc 200Xri
HydroDynamics 10" JP
Tempest Plus 25P-B&B @Steves Custom Props-Josh Edwards
HB999HDSI
HB899HDSI

92' ChampioN 201DCR Elite
13' Yamaha250SHO
HB Helix12 G2N
HB Helix10 G2N

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

Registered: 04/18/10
Posts: 64
Loc: Lufkin, TX
I took one out of my Tempest and it cavitated pretty bad on take off
_________________________
Cross her eyes, and dot her T's

Top
#12430049 - 09/17/17 12:26 PM Re: Help with selecting boat prop [Re: bronco71]
Canny Offline
Outdoorsman

Registered: 04/18/10
Posts: 64
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
_________________________
Cross her eyes, and dot her T's

Top
#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: 1410
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....

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

Registered: 04/18/10
Posts: 64
Loc: Lufkin, TX
Thanks for clarifying, it may as well be something else going on.
_________________________
Cross her eyes, and dot her T's

Top
#12435857 - 09/21/17 02:41 PM Re: Help with selecting boat prop [Re: Canny]
Muzzlebrake Online   content
Extreme Angler

Registered: 12/26/14
Posts: 1630
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)
_________________________
From Genesis: "And God promised men that good and obedient wives would be found in all corners of the earth."

Then He made the earth round...and He laughed and laughed and laughed!


Top



© 1998-2017 OUTDOOR SITES NETWORK all rights reserved USA and Worldwide