Mercury max5 prop
 

Has anyone tried on a sterndrive single?

BBlades??

This is a cut down Maximus to 15" diameter. It has a reduced blade area designed for lightweight hulls running big OB's.
Specifically the X-Cat series boats with 400's in Europe.

Brett

DCB has tried some on our DCB with 400s. Feedback to me, Hooked up nice and felt great at all speeds. Still need to try some various pitch/size and tweaking to do and definitely missing some performance #s(6-8 mph) vs the Merc Cleavers...but they aren't 10K like the cleavers are.

One issue this prop is having is the high rake angle creates bow lift.
With the 400R's on the back, less bow lift is needed.

Brett

Hi!

How is the bow lift and the possibility to run high compared to REV4, 4bl Turbo TXP and 4bl Blaster?

I have bought a 400R and need to run the gearcase much higher than the 350 sci HD version.

Cheeers! Toffen

There is bow lift in these props due to rake and heavy OB's on the back with CG rearward hulls. If you require extra bow lift/stern leverage from your prop, this might not be a good option. For boats with some natural bow lift it will be fine.

Brett

What is the rake on these? is it more then the Bravos?

Hi Brett :)

Thanks!

Hayabusa is running a Checkmate 2400 BRX with a 400R. The best results for him has been with a Blaster 25 running 83,5 mph. I am not sure if I can compare my Phantom 25 with his 2400 BRX. My best speed with a Verado 350 Sci has been 81 mph +/- at 6,550 rpms with a REV4 25 which is shortened 30 mm and cupped. However it do not like so much to be run high.

If I should test out a Blaster should I try 26 inch prop?

Happy New Year!

Cheeers, Toffen

The Maximus props are advertised/marketed at 30 degrees. However, with the decrease in diameter and with the slight deviations advertising can have, we would need to actually MRI the Max 5 to know the truth.
So, yes there is higher rake in the Max than the B! but the overall geometry of the B1 is more conducive to bow lift.

Brett

Yes Toffen, a 26.

Happy New Year to you too!!

Brett

Thanks Brett! I will come back to you on the Blaster in the new year :) Cheeers, Toffen

Even at 15.25" on the Maximus which is what I run, the rake maths out the same but the rake change considerably just at 3/16" per blade; 15.25" on the Maximus with an 80 Cup can fit 90% of all off-shores with Bravo drives especially running MR Blues.

What?

Brett everytime you shorten those blades the rake effect changes (Maximus only offers one fixed rake setting), if it didn't we'd run 16 inch Hering 5-blades and roundear those down to 15.25 inches, but the number changes too much and Hering only offers 20 and 22 degrees of rake.

I'm still not quite understanding your point. You're saying the rake angle is fixed. Then you say the rake effect changes? When we developed this prop in 2002 the rake on those props was advertised at 30 degrees. There is a slight 1-2 degree change when we Lab them at 15.25" diameter. We adjust for that in various ways as needed.
Also you mentioned MR blues. I assume you mean Merc Racing engines. I was wondering what you mean by especially those engines? How does the engine affect prop rake performance?
Hering rake angle are not parabolic. They are available in 16 and 18 degree as well.

Sorry, just trying to understand your thoughts.

Brett

The angle is fixed but you need more of it when you shorten the blade, but if you're maxxed out at 22 degree and you need the whole 22 degree at say 15.625" inches of diameter, and you shorten the blade, it will still be 22 but will perform more like 20, maybe you can add rake to a prop on labbing, most people can't. The rake is so massive on Maximus cutting it down to 15.25 it runs better due the prop thrust below the hull and the prop lift above the hull, but adding is easy if you know how to do it. My Maximus slips at 8.97% on a single engine 15.25X29P on a 28 footer, if it was all about drive height, then leave the Maximus at 15.625" and run a drive spacer, but that doesn't work in this case because the slippage went up to 12.61%. With the MR Blues and the Smartcraft Knock Sensor System it will adjust the timing on the high end for a lower resistance coefficient, so when trimming up to max RPMs, you peg the rev limiter and trim just under it once and you're done, with mine after hitting the rev limiter, you trim down under it and the rpm will spool back up again (usually 4X) everytime it spools up you get a burst of speed, that's where the additional sharpening comes in, you can sharpen 3 edges of the prop as long as you leave the 4 side alone (cup side-reverse edge), if you sharpen the rounded side-reverse edge, now you can adjust the rake for the shorter diameter for what you lost, sharpening the two forward edges allow the boat to go faster, never touch the cup side-reverse edge or the boat will blow out and go slower not faster.

You're out of your mind.

Anyone have real world experience with a max5 yet?

These props are designed for big OB's and light race hulls.
I have not driven one yet but on a Outlaw, I believe the blade profile should be the same as the stock version cut down with rake adjustments.
Our feedback has also reflected this.

Bret