Straight Bottom Top Gun TRS Prop?

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01-25-2019 | 10:34 AM

#11

bbladesprops

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Joined: Jun 2003

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From: Princeton, Wisconsin

Quote:

Originally Posted by YoungGunKC

Thsy are 25p 3 blades. Idk why I thought 28

25 pitch propellers makes a big difference. Your slip at cruise is now 22%. That is a normal number for 4K.
Get a WOT rpm number and look at your slip %. I'm assuming the numbers will be fine.
There some options to increase planing speeds with the 3 blades. Or 4 blades are a great option. We have installed 4 blade propellers on TRS drives for years without issues. Of course driving habits play into longevity.

Brett

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01-26-2019 | 01:03 PM

#12

YoungGunKC

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Joined: Aug 2018

Posts: 33

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From: Kansas City

Quote:

Originally Posted by bbladesprops

What pitch should I be looking at if I were to go to a 4 blade?

01-31-2019 | 09:05 PM

#13

bbladesprops

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Joined: Jun 2003

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From: Princeton, Wisconsin

Quote:

Originally Posted by YoungGunKC

What pitch should I be looking at if I were to go to a 4 blade?

WOT rpm and speed with your truly stock 3 blades with a "standard" load on a"standard" day will ultimately make the decision. Propeller pitch does vary from each manufacturer making the correct pitch choice for a specific 4 blade a bit more complicated than my next sentence..
The standard answer to your question is to go down 1inch of pitch when you go from a 3 blade to a 4 blade to maintain the same WOT rpm..
When the time comes and you have good numbers, I think the stock OB/FX propellers in 15.25" diameter or Bravo 1's Labbed correctly will get you to your goal.
Let me know if you want to test some OB/FX props or any other questions you might have.

Brett

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Brett Anderson / BBLADES Professional Propellers
920-295-4435 http://www.bblades.com/
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02-06-2019 | 09:39 AM

#14

flashgordon

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Joined: Sep 2012

Posts: 523

Likes: 38

From: new baltimore mi

MY 2 CENTS--info on what i have and compare
38 old straight v bottom trs drives 547s about 700hp
hydromotive props 4 blade 26 p
5600 rpm 82 mph 4 people , flat water,full tank of gas
10.7 slip factor
talked to bblades,,,said was pretty good numbers. said run half tank, 2 people , some chop,,boat should run 85
i push the rpms to about 3000, , props slip for 5 - 10 seconds ,,then finally catch..

but,,,,,,,,i have been ask why i am not running a BRAVO prop??

anyone have similar setup and running ???

Last edited by flashgordon; 02-06-2019 at 10:16 AM. Reason: spelling

02-07-2019 | 07:17 PM

#15

Full Force

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Joined: Oct 2005

Posts: 11,688

Likes: 216

From: Olmsted Falls,Ohio Marblehead,Oh

Quote:

Originally Posted by cigrocket

I'd say the speed is correct for 500's. As for the cavitation, Like F-2 Speedy said .tuck the drives all the way and no need for tabs. More importantly is initial hooked up speed and boat attitude to plane with the TRS and 3 Blades. I personally wouldn't change the props. Speed # seems right on. Have to see what RPM's you are turning at 72MPH. I will assume 5200-5300 which would be right on. 3 Blades are less stress on the TRS drives. Even though the horsepower is only 500, might as well not work drives too hard with Shock. Enjoy the boat

I agree with this, 3 blade and deep TRS will have the best top end and the 25 plus has a great cruise speed, you can work them a little to dial them in, I see no reason to need the stern lifting 4 blade on a lower HP Gun, the Mirage plus 25 carrys the bow nice when hooked up, not a huge fan of 4 blade and TRS's if you run hard, deep drives really don't need them