400 with 1.76 transmission prop choices

[snowboardintahoe]

I saw it, I am just a skeptic and want to confirm there is actually a difference in clearance. (Unless someone actually had burn in)

I have a 15.5 / 11 on it and it rips people out of the water and gets on plain very easy but when we cruise to the other side of the lake (22 miles) the 7mph loss is not awesome.

If there is a difference in clearance I will probably run 15.5/12.5 because the stock 15.5/16 couldn’t get me above 11mph loaded 12 people 1000k lead

[KnoxMojo]

Dakota put a plate on his to prevent prop burn. It will burn. 15.5x12.5 is what I'd go with for your elevation and wanting a little more cruising speed

[HFarr]

I saw it, I am just a skeptic and want to confirm there is actually a difference in clearance. (Unless someone actually had burn in)

I have a 15.5 / 11 on it and it rips people out of the water and gets on plain very easy but when we cruise to the other side of the lake (22 miles) the 7mph loss is not awesome.

If there is a difference in clearance I will probably run 15.5/12.5 because the stock 15.5/16 couldn’t get me above 11mph loaded 12 people 1000k lead

Wow! I have a 15.5x15 on a Makai with a 400/1.76 that runs fine with all ballast full and a crew of 12+. Of course I am only a few hundred ft above sea level.

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[Tommy2slow]

You’re first stop (and it will probably be you last) when researching a new prop should be Jim Thelen at ACME. He will ask all the right questions to get you the prop you need. I have a 15” x 13” and it is super aggressive but will still do 32 mph. I couldn’t really imagine going with anything with less pitch than that at our 2200’ lake. As far as diameter goes, Supras can, generally speaking, run a larger prop than Moomba. I measured my clearance and a 15.5” prop would not have left enough clearance on my 2020 Mojo. My boat came with the OJ that I think they call 15.5” x 16” and it was the completely wrong prop for that boat with extra ballast. It was the same diameter as the new Acme 15” prop and too much pitch for the boat. The new prop will get the boat up on plane with full ballast but I only tried it once to see what it could do. I would never run the boat like that in normal use.

Keep in mind when choosing a prop that you don’t need a prop that can get you across the lake at 35 mph with a crew of 10 and all 5000#’s of ballast full. Most members on here high idle to their favourite surfing spot while filling and only run about 50% ballast when wakeboarding. I have heard a few members comment on how happy they are with the 13.9” pitch that they are running. I suspect that it still has lots of grunt while running a little lower rpms. I have about 4800 #’s of ballast and and 1100 #’s of crew and turn about 4100 rpm at 12 mph.

That’s my two cents. I hope you find the perfect prop and please let the forum know what you pick and how it performs. The search for the elusive perfect prop is never ending.

[SONIC]

Keep in mind when choosing a prop that you don’t need a prop that can get you across the lake at 35 mph with a crew of 10 and all 5000#’s of ballast full.

But that's the dream isn't it

[snowboardintahoe]

I spoke with Jim from acme and he put me on the 15.5/11 and I should have returned it with in the 30 days but I didn’t want to pull my boat out of the water(30min each way 70$ launch fee and $7.49 a gallon and I have to tell my wife she’s doing great when she’s got the trailer on the curb)
He was very concerned about my elevation and extra weight. 15.5/13 here I come!

[HFarr]

I spoke with Jim from acme and he put me on the 15.5/11 and I should have returned it with in the 30 days but I didn’t want to pull my boat out of the water(30min each way 70$ launch fee and $7.49 a gallon and I have to tell my wife she’s doing great when she’s got the trailer on the curb)
He was very concerned about my elevation and extra weight. 15.5/13 here I come!

LOL!! I have seen some of the best arguments and fussing take place at the boat ramp! Nothing makes someone madder than having to wait on a trailer to be pulled up and back over and over the same crooked way every time! LOL. Especially if there are other people waiting to use the ramp. Or the other side of the equation where the boat driver pulls up and back because they just can't hit the bunks straight. Yep. Some good yelling takes place there for sure. But, I am very fortunate in that my wife can back a trailer very well. I have even been sitting just offshore in the boat and seen her get out of my truck and go back someone else's truck and trailer down the ramp for them after watching them pull up and back several times! Gotta say it's funny to watch a man get out of his truck (which it has been a man a couple of times, but mostly other women) to let a woman back it for him. People usually cheer for her too.

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[Moombas]

I've now spoken to 3 gentlemen with Moomba Max's that run 16" prop and have been for a few years with no prop burn.

2 of them are running the ACME 3337 and one of them is running the OJ 963.

When talking to Jim over at ACME he does think a 16" prop is just going to perform better with the 1.76:1 trans.

He explained the deeper the gear ratio the more necessary and critical prop diameter, and that If I feel comfortable running a 16" prop that will be the better decision.

I am thinking of going for it, as I have not yet heard of any prop burn on the moomba Max specifically.

[larry_arizona]

A thin piece of stainless glued on to prevent any burn would be great.

I have seen that used before.


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[Dukabor]

A thin piece of stainless glued on to prevent any burn would be great.

I have seen that used before.


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I was originally concerned with prop burn when I switched to a 16”…. Ran it all last season and did not see anything on the hull… that is on a Makai of course, so I cannot speak to other models…. Nothing wrong with adding some protection if it helps you sleep better at night !