2021 Mojo Update

[HFarr]

I have a 21 Makai. 400 Raptor. 15.5x15 prop. 1.76 trans. Never struggles loaded down. Top speed of 38 mph no problem

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[TXSurf4]

I have a 21 Makai. 400 Raptor. 15.5x15 prop. 1.76 trans. Never struggles loaded down. Top speed of 38 mph no problem

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What is you surf weight set up and do you know what your RPMs are at surf speed? I ask bc I am curious to see what will happen when I switch out to my ACME 2847. I expect my RPMs to bump up a little but not sure how much.


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[uniwarking]

Thanks all. I’ve requested to change to the general use 16.5”, I think that will best serve my needs… if something need changed this will make a good spare


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[HFarr]

What is you surf weight set up and do you know what your RPMs are at surf speed? I ask bc I am curious to see what will happen when I switch out to my ACME 2847. I expect my RPMs to bump up a little but not sure how much.


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Boat is 5,300, ballast full at 4,000 , full tank and 10-12 adults and older teens. One cooler. No lead (yet anyway). Probably running about 11,500 average. My rpm's surfing are anywhere from 3200-3700 at times depending on speed. My lakes elevation is 237' above sea level.

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[cozilla]

I have the "Altitude/Wake" - OJ 15.5 x 15" on my 2021 Mojo. I run full ballast and 1k lead and surf speeds around 11 mph. RPMs rang from 3600-3800. Pulls great and doesn't struggle. This is with the Raptor 400.

[TXSurf4]

Boat is 5,300, ballast full at 4,000 , full tank and 10-12 adults and older teens. One cooler. No lead (yet anyway). Probably running about 11,500 average. My rpm's surfing are anywhere from 3200-3700 at times depending on speed. My lakes elevation is 237' above sea level.

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Thanks for the info. The next time I am out I am going to run just me in the boat with full ballast and the 1k in lead to just get a base line on the OJ 15.5x16.5 with 450 and 1.76 trans then do the same when I put the ACME 2847 and see how it affects the RPMs.

[HFarr]

Will be interesting to see the difference!

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[Hayden]

Pitch makes a huge amount of difference with this. 8 deg vs. 9/10/11 deg. It should be part of the conversation in my opinion, same as elevation, engine size, prop diameter/pitch. It you are running stock autowake pitch, I believe it's 8 or 8.5. The difference in rpms from running 8-10 deg pitch with +11k boat/ballast weight is probably close to 1k rpm. (That was my experience with it over this summer.)

[TXSurf4]

Pitch makes a huge amount of difference with this. 8 deg vs. 9/10/11 deg. It should be part of the conversation in my opinion, same as elevation, engine size, prop diameter/pitch. It you are running stock autowake pitch, I believe it's 8 or 8.5. The difference in rpms from running 8-10 deg pitch with +11k boat/ballast weight is probably close to 1k rpm. (That was my experience with it over this summer.)

That is a very true statement. Pitch will definitely affect your RPMs and is often never brought up in the prop/RPM conversation.


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[larry_arizona]

That is a very true statement. Pitch will definitely affect your RPMs and is often never brought up in the prop/RPM conversation.


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I will pile on here about pitch affecting RPM significantly. I think 9 degrees is plenty and 10 degrees is way too much as it really starts loading the engine exponentially.


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