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Originally Posted by YoungGunKC
(Post 4669655)
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 |
Originally Posted by bbladesprops
(Post 4669723)
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 |
Originally Posted by YoungGunKC
(Post 4669876)
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 |
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 ??? |
Originally Posted by cigrocket
(Post 4669716)
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
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