Re: Prop help Best Prop for a 28 heat
 

Hey Glen,
my hard drive has been repaired; sorry for the delay.
I think your correct in chosing the 28. My 27 replaces my 28 here at altitude. I run a Bravo 30 at the lower elevations and there is no way I could run the 27 down there without instantly hitting my rev limiter.
You've got some rpm to work with so the 28 should put you where you need to be.
Are you going to demo one or buy one and are they going to cup it a bit for you?
Dave

Re: Prop help Best Prop for a 28 heat
 

Hey Dave,
Glad you got your hard drive repaired. Thanks for the help with the prop selection. I need to talk to Hydromotive again, I forgot to ask them about putting some cup in it. I do not want to void their exchange policy until I know forsure that the 28 will be the right prop. Plus money is tight now so I may have to wait a bit. But I am very anxious to try a P5X. I took a video of a fast pass yesterday and watched it this morning the boat can use some bow lift, I was throwing a pretty high rooster tail and I have to belive that is a lot of slip. Plus the BMax drive is large and may be pushing some of the water away from the prop? The 5 blade may be just what I need. I'll keep you posted on what I come up with. Talk to you soon. Glen

Re: Prop help Best Prop for a 28 heat
 

And for you guys running 28's that don't have a bazillion horsepower... Hydromotive makes the P5X all the way down to a 25 pitch. I've been running one for a couple of months now and can say it totally changes the way the boat handles. I can even pull a tuber and make sharp turns without it blowing out at all. I've tested it back to back with a stock 26 Bravo 1. It turns about 100 RPM less at WOT and runs the exact same speed. Where it really shines is when you load the boat up with a lot of people in the bow and mid cabin. I am spinning the 26 to 5600 RPM @ 75 MPH/GPS. The 25 P5X turns 5500 at the same speed. Julie is confident that labbing that prop would add some speed. But it looks like I may be stepping the power up a little this winter so I'm not going to mess with it.

Re: Prop help Best Prop for a 28 heat
 

Hey Bob,
"a little"??
;o))))))))))))))))))

Re: Prop help Best Prop for a 28 heat
 

I just purchased a 28" P5-X from Julie at TU today. I'll test it this weekend and report the results here.
Regards,
Steve

Re: Prop help Best Prop for a 28 heat
 

Steve,
happy testing. May be a bit steep but they'll dial it in for you.
My 27 that I run at high elevation worked better with cupping added.
85-86 GPS @ 5700+ rpm.
Let us know how she runs and remember a little trim at a time but it will eventually trim out much higher than the Bravo. Hopefully your trim limiters aren't set too low and if so hit the trailer button a little :drink:
You'll love the planing and cruise speed.
Dave

Re: Prop help Best Prop for a 28 heat
 

Hi Dave:
You may be correct on the 27". I'm only making approximately 625 pshp, and I know you're running more. It was a just a educated :rolleyes: guesstimate.
I plan a few mild mods this winter, so I'm keeping that in mind too.
Whatever size I end up with, I have plans to have it labbed. I wanted to go stock initially for exchange/evaluation purposes. Once I get a baseline on the 28", I'll be able to make an objective determination.
I have the high perf transom assembly, so there's no limiter on my trim except common sense :drink: ............
We plan to try it on my buddy's 29' Fountain/575 too. Should be interesting.
Best Regards,
Steve

Re: Prop help Best Prop for a 28 heat
 

Sound fun...keep us posted!

Re: Prop help Best Prop for a 28 heat
 

Step hulls are 2000 on, along with new engine hatch/back seat, and lower windshield.

Re: Prop help Best Prop for a 28 heat
 

Guys,
I did get to test my new P5-X yesterday. Unfortunately, I only got to make one hard pass before my water pump housing cracked, and I had to limp back in. The out of the box 28" ran 80 MPH @ 5500 RPM, with a calculated slip of 17.5%.
My buddy ran it on his 29' Fountain. It ran 86 MPH @ 5450 on his boat. Both boats are similarly powered with HP575SCis with the AZS&M boost kit. Looks like the efficiency/performance edge goes to the F Troop. However, I still prefer the looks and space of the Nordic.
My general impression of the P5-X is that it runs very well for an out of the box propeller. My best Merc lab 30" Bravo runs 80, but the Hydromotive has a much stronger holeshot, carries the boat better, and is more efficent in the midrange. The blades are beefy, and I'm sure with some thinning, balancing, and fine tuning of the cup, that there's more here. I'll let you guys know how that goes if I get it back prior to having to winterize. Around here (Nashville), that usually means Thanksgiving.
Best Regards,
Steve Z