What Props should I try for my DCM Mach 22 500 HP??
 

I have a 26" bravo on the my DCB Mach 22, reving 5,500 RPM (I think that is 200 over peak RPM??)

The hull is a tunnel with a raised center hull, and the sponsons are stepped.

Will try a 28 Bravo, but was reading a bit about the Maximus on the Mercury site, sounds interesting, but have no experience with them. Or 5 blades.

Currently boat gets on plance nicely, mid throttle speed is not great but does not feel like it cavitating, top speed is 80 MPH.

Drive is stock height (it had a shorty, but previous owner did not like the way the boat felt with it)

Here are a couple of sites that may help...

http://www.mercuryracing.com/propell...calculator.php

if you are unsure of you slip try it site...

http://go-fast.com/Prop_Slip_Calculator.htm

you may be able to find a company that will sell you a prop after you get to try them out and see which one works best, there a a couple of places like this in florida however I have never used them.

I tried the calulator.

26" pitch, 1.5 gear ratio, 5500 RPM 80 MPH = 11% slip

Is that 80 on the speedometer or GPS ?

I would try a stock 28p Bravo 1 or a 20p Lab finish. If you feel the 26 is on the limiter a 28 will take about 300 RPM. But, you say there is really no slip, I would go LAB finish and pull the 30p. Generally, a lab finish is equal to 1 even pitch difference up, if the slip is in your favor.

Feel free to give us a call and we can get you all worked out!

Eric

TEAGUE CUSTOM MARINE
661.295.7000
www.teaguecustommarine.com

Thats on the Gaffrid non-GPS speedo.

(is there an iPhone app i can download for GPS??)

Thanks,

I'll try the 28 this weekend and post the results. And if I can find a 30 Lab I can try will give that a shot as well.

What are you thoughts on the relativly new Maximus 5 blade??

All the guys I know running 22 DCB's with IO's run BRAVO props. I'd bet the 28 would put you right where ya want to be.


Darrell.

Just curious, you might have more slip than you think. The 28 Bravo should be a good choice.

I tried the 28
 

I tried the 28 this weekend.

Ran faster, much faster mid range. 56 MPH ish at around 3,500 RPM (about 7 MPH more than the 26)

Topped out at 85 MPH (increase of 4 MPH)

Revving @ 5,500 RPM

Takes a while to get there, from 70-85.

used the calculator, shows a prop slip of 13%

Will try to find a 30 to try now.