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Old 09-17-2011, 12:22 PM
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Propeller shootout

2011 X25 5.7 Ilmor

Stock prop ( not even sure what it is )
OJ 5 blade
OJ 14.25x14.5
ACME 1285
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  #2  
Old 09-17-2011, 03:09 PM
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Ooooh, look at that 5 blade..... wow......
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Old 09-17-2011, 07:12 PM
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Some background: We have been having a little trouble with holding speed as well as with getting the boat on plane. Our dealer recommended the 1285 prop from ACME and of course, the 5-blade is new and shiny and promises better gas mileage. OJ also recommended their 4-blade but as it turns out we already had that prop on the boat.

Disclaimer: I'm not a hydrodynamic engineer and I don't pretend to be. This is not a scientific analysis, it's just a little real-world testing that was done on our boat in our lake with our criteria.

So we tried out each of these on the boat this afternoon and recorded the following statistics with no ballast, stock ballast, and stock+plug and play.
- Time to get on plane (s)
- Top Speed (from GPS)
- RPM @ 20mph (using speedometer/perfect pass reading)
- RPM @ 30mph (using speedometer/perfect pass reading) *just with no ballast to test cruising speed
- We also tested our surf setup for RPMs at 10mph.

Weather: 65 degrees, light wind.

Now the raw data:

-----------------------------No Ballast---------Stock Ballast----------------Stock+PnP

--------------10mph----------------------------------------------------------3050 RPM *surf setup
OJ 4-blade--20mph-------3540 RPM----------3650 RPM--------------------3950 RPM
--------------30mph-------4500 RPM---------------------------------------------------
--------------on-plane-----5.9s----------------7.1s--------------------------15s-------

--------------10mph----------------------------------------------------------2800 RPM *surf setup
OJ 5-blade--20mph--------3150 RPM----------3250 RPM-------------------3350 RPM
--------------30mph--------4300 RPM---------------------------------------------------
--------------on-plane------6s------------------7s---------------------------10s--------

--------------10mph----------------------------------------------------------2950 RPM *surf setup
ACME 1285--20mph--------3400 RPM----------3550 RPM------------------3700 RPM
--------------30mph---------4450 RPM-------------------------------------------------
--------------on-plane-------5.5s----------------6.3s------------------------9s--------


Comments: The 1285 is an excellent prop especially if you're running a lot of ballast. It's an animal. The boat snaps up onto plane and is very responsive to throttle changes. It also has some improvements on the fuel economy side over the stock prop.

The 5 blade is something altogether different. Although it doesn't have the raw bite of the ACME, it is no slouch either. The RPM gains in all speeds and all ballast configurations are very hard to ignore. The deciding factor, though, was something that was not expected: With the 5-blade propeller, the boat was a lot more responsive at idle speeds. Steering seemed to be improved, reverse seemed to snap the boat back to the stbd compared with a lot of drift with the 4 blade propellers.

At the end of the day, we put the 5-blade back on and will give it a try tomorrow with some actual riding conditions....

Last edited by ShawnB; 09-20-2011 at 12:53 AM.
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Old 09-17-2011, 08:07 PM
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Cool observations, thanks for posting your results. The 1285 prop has awesome gains on the hole shot. I bet the top speed was not very different over the stock prop as the 30 mph RPM's are very close. Any top speed data for the different props?

Did you notice and differences in the wake shape or rooster tail with the different props?

Was the idle maneuvering of the 1285 prop the same as your stock one?

Give us an update after you are done riding.
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Old 09-17-2011, 08:54 PM
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Top speed on stock was 37.5, 5-blade 38.5, 1285 39.
I didn't see any difference in the shape of the wake but I didn't ride at all yet.
Yes the idle maneuvering with the 1285 was pretty much the same as stock.
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Old 09-18-2011, 08:57 PM
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Thanks for the input... performance wise that ACME 1285 is the cats azz for hole shot and it even added 1.5 mph top end, impressive!

Tough choice I would say on which prop to choose, but....

I guess it depends on your boat usage, if you start and stop a lot with riders then the RPM difference of the 5 blade over the ACME for any gas savings might be a wash in the end. However they both get on plane noticeably better than stock and if you are mostly wake boarding at 20mph with full ballast the 5 blade RPM at that speed is definitely going to get you the best fuel efficiency. So I can see why you chose the 5 blade prop. It should make you much happier than the stock prop.

Have Fun trying it our and post up any more observations you have after some time on the water.
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  #7  
Old 09-19-2011, 11:59 AM
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I'd be curious what your stock prop is?
I run the OJ 14.75 X 15.5 on my 2005 X-star (MCX) and am pretty happy with its all around performance. I would bet your top speed would be more with this prop, but will suffer some on the holeshot. I run 2000# of ballast with 5-6 people in the boat. No doubt the 1285 would be better for me, but fuel economy would suffer a little plus not enough top speed for footin'
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Old 09-19-2011, 12:00 PM
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BTW, mine hits the rev limiter with the OJ 14.25 X 14.5
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Old 09-19-2011, 12:13 PM
tommcat tommcat is offline
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Quote:
Originally Posted by Jerseydave View Post
I'd be curious what your stock prop is?
I run the OJ 14.75 X 15.5 on my 2005 X-star (MCX) and am pretty happy with its all around performance. I would bet your top speed would be more with this prop, but will suffer some on the holeshot. I run 2000# of ballast with 5-6 people in the boat. No doubt the 1285 would be better for me, but fuel economy would suffer a little plus not enough top speed for footin'
What is your top speed with that prop? that's the one OJ suggested i try on my 205dd to help with holeshot when loaded with ballast. i dont want to lose too much top speed though since i want to try barefooting next season. i know our hulls are vastly different but still looking for your thought on it.
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Old 09-19-2011, 12:16 PM
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Stock was the OJ 14.25x14 "High altitude" prop. It is was fine for up to stock ballast but struggled beyond that. We don't ski or barefoot so top end wasn't really a factor for us. I am curious what prop is stock with the other motors and without the high altitude option.
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