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Old 05-10-2007, 05:59 PM
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Question Prop question

I recently upgraded to a Prostar 197 from a '92 Prostar, so naturally I've got quite a bit more power. I went from 44mph to about 55 mph. I am going to need to get my prop repaired on the new ('02) boat. It is a 13" x 13" OJ S.S. 4-blade. I was thinking about changing sizes to maybe get better fuel economy with gas prices skyrocketing. I would even be ok loosing a little holeshot power, as I don't use anywhere near full throttle as it is. I primarily pull up 180 lb slalom skiers and barefooters.
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Old 05-10-2007, 06:06 PM
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55? That's way faster than I've ever heard of a 197 going. 13X13 is the standard prop for a 1:1 transmision. Alot of folks are switching to an Acme 541 3 blade. It seems to be smother and quicker than the standard OJ 4 blade.
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Old 05-10-2007, 11:12 PM
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Quote:
Originally Posted by 32offer
I recently upgraded to a Prostar 197 from a '92 Prostar, so naturally I've got quite a bit more power. I went from 44mph to about 55 mph. I am going to need to get my prop repaired on the new ('02) boat. It is a 13" x 13" OJ S.S. 4-blade. I was thinking about changing sizes to maybe get better fuel economy with gas prices skyrocketing. I would even be ok loosing a little holeshot power, as I don't use anywhere near full throttle as it is. I primarily pull up 180 lb slalom skiers and barefooters.
http://www.waterskimag.com/product.j...clientID=17146

What engine do you have ... unless you have an 8.1L or some supercharger setup you need to verify your speed with GPS, as the LQ9 in a 2002 197 (pre-hook) ... will allegedly top out @ 47.2

boat Specifications:
Year2002Length Overall (Feet)19Length Overall (Inches)8Displacement2800Fuel Capacity28Load Capacity1340Seating Capacity10Acceleration to 36 MPH (seconds)6 seconds; 170.3 feetNoise at 36 MPH89 D 92 RNoise at Idle59 D 61 RTest EngineIndmar LQ-9 6.0L EFI 385hpTest Prop14 x 20 OJ 4-bladeTop Speed47.2
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  #4  
Old 05-11-2007, 08:56 AM
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The "pre-hooked" hull on this boat was a bit faster than the hooked version but only by about 1-2 MPH. I believe that I clocked mine at 50 on a GPS before hooking it.
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Old 05-11-2007, 09:48 AM
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Wow, 55mph. How many hours, options, what engine? Maybe I'll trade you for my 02 with the Predator . I get 47.2mph with a 3blade 14pitch. Hull is stock, no hook added....yet. As for fuel economy, I have no idea - I just keep feeding her when she needs it. Summer's too short here to worry too much!

Check this thread for prop performance info....
http://www.tmcowners.com/teamtalk/sh...t=11251&page=3
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Old 05-15-2007, 12:07 PM
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Well....at least that's what my speedo AND Perfect Pass are reading. I just bought the boat a couple weeks ago and haven't had it in the slalom course yet to time it or GPS'd it, so it could definitely be a little off. It feels a lot slower at 36 mph while skiing than my last Prostar did. So say it's off by 5-6 mph at 55mph, it would be a couple mph off at 36 mph.
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Old 05-15-2007, 02:38 PM
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The speedo and the PP get their input from the same source (paddle wheel). You can calibrate the speedo and PP in the wakeboard mode with a GPS but I'm pretty sure that the slalom mode must be calibrated on a course using magnets or the smart timer.
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Old 05-15-2007, 03:24 PM
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I have a 2002 197 TT with LQ9 and Powerslot, Hooked hull Stock OJ 4 Blade. I'm seeing 52.8 on top end. 34.2 and 36 are verified in the course and GPS as spot on.
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Old 05-15-2007, 03:51 PM
TRBenj TRBenj is offline
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Quote:
Originally Posted by #47of100TeamMC
I have a 2002 197 TT with LQ9 and Powerslot, Hooked hull Stock OJ 4 Blade. I'm seeing 52.8 on top end. 34.2 and 36 are verified in the course and GPS as spot on.
Did you verify the 52.8 on GPS?

The only reason I ask is because Ive set speedos in the course at slalom speeds with the smart timer, and PP is still off on the top end by ~3 MPH (reads 49, actually 46 according to GPS). One would think that calibrating the paddlewheel in the course would make it read correctly at all speeds, but it doesnt!
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Old 05-15-2007, 03:56 PM
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What is this "hooked" hull everyone speaks of? Some sort of modification? What is the reason and what does it improve?
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