Prop
#1
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Prop
Hey Guys,
I have a 1988 22' steve stepp velocity with a 454 bored .30 over (420HP) with a bravo 1 drive. I had a 23p mirage on the boat and got 63 mph out of her. I put a 27p labbed and cupped hydromotive 4 blade and got a 10 mph gain but I could only get 4200 RPM's out of it. I'm looking to see what I should try next and if anyone would be willing to exchange or buy the 27p I have now. Its in great shape only used a hand full of times. Thanks
I have a 1988 22' steve stepp velocity with a 454 bored .30 over (420HP) with a bravo 1 drive. I had a 23p mirage on the boat and got 63 mph out of her. I put a 27p labbed and cupped hydromotive 4 blade and got a 10 mph gain but I could only get 4200 RPM's out of it. I'm looking to see what I should try next and if anyone would be willing to exchange or buy the 27p I have now. Its in great shape only used a hand full of times. Thanks
#2
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That's a huge pick-up in MPH for just a prop change! I wouldn't expect any more MPH with another change since the bigger prop (within reason) is usually faster. I'd stick with the Hydro Q4 (Dkerns dialed in his late 1980's 22' in with Q4) and try a 23" to 25" one to get a RPM reference point. What RPM were you spinning with the 23" Mirage?
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That's a huge pick-up in MPH for just a prop change! I wouldn't expect any more MPH with another change since the bigger prop (within reason) is usually faster. I'd stick with the Hydro Q4 (Dkerns dialed in his late 1980's 22' in with Q4) and try a 23" to 25" one to get a RPM reference point. What RPM were you spinning with the 23" Mirage?
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What RPM range is the is the motor built to run in ? IMO your better off watching the gauges while working the throttle , and skip using a rev limiter . If your propped right , it should only be a problem when you launch .
#6
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I've got Dkerns old Velocity 22. Runs great with the Hydro QIV. Its a 26 repitched to a 27. I've run low 90's(92-93) gps at 6100-6200 rpms. 3 blades like a Mirage have too much bow lift. Slower speed and longer to plane.
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What kind of engine are you running? Sounds bigger than what I have.
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My guess is the 25" should have you at around 5000 RPM under the same conditions , and your 23" should take you up to aprox 5800 ?
Last edited by notda1; 07-20-2011 at 07:25 PM.