New power, where to start with prop?
#1
Registered
Thread Starter
New power, where to start with prop?
I have a Powerquest Spectra 222 XL that had a 330/Bravo 1. With that power I could turn a 21p Mirage plus at 46-4700rpm @ ~57-58mph. Would turn a 23p Mirage plus at 44-4500rpm @ ~58-59mph. I am in the process of replacing it with an old Mercruiser 425 that seems to be in good health. Any idea where to start as far as prop and what kind of mph I should expect? Was thinking of buying a 23p as the one I tested was borrowed, but don’t want to go too small. Thanks in advance.
#2
Were doomed!
Charter Member
the 23p mirage plus 3blade seems to be the prop to start with for most boats. Depending on what kind of hp and rpm's you can turn will determine your mph. If you can get that 23 spinning up around 5200rpm you "should be" in the 67-69mph range with all things being equal.
__________________
-Wally
Money can't buy happiness, but it can buy horsepower. And I've never seen a sad person hauling a$$!
-Wally
Money can't buy happiness, but it can buy horsepower. And I've never seen a sad person hauling a$$!
#3
Gold Member
Gold Member
After several projects of getting hyped up about new power, I am sure 99% of people on OSO would say start with your old props first. Assuming the new power can push a few more RPM, you probably will be fine with the 23P.
#6
Registered
Thread Starter
Okay, now that I think I know where to start with propping I have another question. Do I need a solid hub with 400+hp in a 4000lb 22’ boat with a B1? What is the difference between the old mirage plus that looks like it doesn’t have a removable hub and putting a solid hub kit in a newer mirage plus?
#8
Offshoreonly Advertiser
Offshoreonly Advertiser
Hi Griff. Remove the sleeve and check it on the nut end where the aft adapter slies in. Cracks will start to form there first before failure.
I'm sure you keep spares on board as well.
Mercury says over 400 hp should use solid inserts,
__________________
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]
#9
Registered
.https://www.mercurymarine.com/en/us/...or/#!/step-one
#10
Offshoreonly Advertiser
Offshoreonly Advertiser
Once you have run the 23p, you can input the results into a prop selector..
.https://www.mercurymarine.com/en/us/...or/#!/step-one
.https://www.mercurymarine.com/en/us/...or/#!/step-one
That being said, the selector can be a starting point but do not take it as the final word. You are better getting base line info with a known true stock propeller and contacting BBLADES or a trusted set up pro to help you achieve your particular goals.
Brett
__________________
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]