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Old 12-17-2018, 01:04 AM   #1
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Default Prop Question

I have a 2006 1800 MX
3.0 with Alpha one Gen 2

Im trying to find out what the original prop is. (make and pitch ect)

It has a quicksilver prop now and I cant read the numbers (looks like 1818e21)
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Old 12-17-2018, 03:18 PM   #2
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most likely it was a 19P, 14.5 inch prop. This a good general use prop for your boat. If you're doing a lot of water sports that require good hole shot, then a 17P will give you excellent performance and time to plane. You just have to keep an eye on RPM as it's easy to overspeed.
Have you done WOT test with current prop yet?
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Old 12-18-2018, 02:52 AM   #3
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im not sure how to to do that
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Old 12-18-2018, 11:32 AM   #4
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Quote:
Originally Posted by tech62571 View Post
im not sure how to to do that
Find a nice open place on the water, get it up on plane then push the throttle all the way open. Record max RPM and Speed, this will be you WOT. For a more accurate reading turn the boat around and do it again in the opposite direction and then take the average of the two reading. This will account for current and wind influences.
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Old 12-21-2018, 12:09 AM   #5
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will do.. thank you
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Old 03-07-2019, 07:24 PM   #6
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finally got to do a WOT test.

at full throttle I'm at

5000 RPM and 40 MPH
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Old 03-07-2019, 07:26 PM   #7
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also do you think a stainless is better then Aluminum?
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Old 03-07-2019, 07:40 PM   #8
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That RPM and MPH works out to approx. 42 MPH with an 18 pitch prop, so that probably what you have since you see the number 18 stamped on your prop. I also see the 21, but don't think you have a 21 pitch prop because that would give you about 50 MPH. This is assuming your drive is a 1.98.
So your current prop size is probably going to be good for water sports and hole shots. If you're not really interested in water sports and just like cruising around, you should try and 21 pitch prop. It will bring your WOT closer to specs and give you higher top end.
I personally like aluminum because the blades flex, and, there is less shock transmitted to the outdrive if you hit something hard with your prop.
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Old 03-07-2019, 08:51 PM   #9
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not sure if it matters for the test but the prop is pretty nicked up.
is there a way to measure it to find the pitch?
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Old 03-07-2019, 10:09 PM   #10
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Take it to a prop shop and they can refinish it for cheap. 5000 RPM sounds a bit high to me.. But not by too much. I'd think 4400-4800 would be the desired range.
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