Need Prop Input
#1
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Join Date: Mar 2006
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Need Prop Input
I Have A 30 Ft Single Step With A Merc 575sc Xr Drive With The Its System. Im Usiing A Non Labbed Bravo 26 Pitch And At Wot Its At 4900 Rpm And About 72 Mph. I Want To Get A New Prop To Gain Mph But I Dont Know Much About This Topic So Any Input Will Help. Thanks In Advance
#3
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Re: Need Prop Input
i agree with FASTER though, work with the prop you have now, you arent that far off of where you need to be. contact Throttle Up or someone local to you that knows what they are doing.
#5
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Re: Need Prop Input
The 575 sc needs to run at about 5300 RPM at WOT. So you need 400 RPM, which really is a lot of RPM but possible. You could consider down pitching your prop down inch and labbing for about 200-250 RPM. OR the alternative to labbing would be to look at a 24P Bravo I stock and possibly needing a few small adjustments after base lining.
Julie
Julie
#6
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Re: Need Prop Input
I would Lab the prop you have. If the prop is true box stock, we should see 5200rpm. This is a great rpm for your engine. Mercury states 4800 to 5200 recommended range. The rev limiter is set at 5400. We prop to 5100-5300 on set ups depending on the needs.
I wouldn't go to the 24 Bravo 1. You will gain rpm but not speed. Also you will lose cruise speed! Your slip is 8%, that's great! Lab the 26.
I wouldn't go to the 24 Bravo 1. You will gain rpm but not speed. Also you will lose cruise speed! Your slip is 8%, that's great! Lab the 26.
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Brett Anderson / BBLADES Professional Propellers
920-295-4435 http://www.bblades.com/
[email protected]
Brett Anderson / BBLADES Professional Propellers
920-295-4435 http://www.bblades.com/
[email protected]
#8
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Re: Need Prop Input
selfmade:
I have a similar setup to yours (575/28 Nordic Heat), and have great results with a Hydromotive P5-X. I also agree that you should try to turn as many RPMs as possible, just below the limiter. With a supercharged motor, boost comes with RPM, and HP and torque come with boost.
Steve
I have a similar setup to yours (575/28 Nordic Heat), and have great results with a Hydromotive P5-X. I also agree that you should try to turn as many RPMs as possible, just below the limiter. With a supercharged motor, boost comes with RPM, and HP and torque come with boost.
Steve