Hydromotive Props
08-07-2002, 04:41 PM
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Hydromotive Props
Has any one used the hydromotive quad 4 props? How did it compare to what you replaced? RPM gains, loss I'm thinking of going from 25p mirage to 23 quad 4. With my 454 330hp motors I can only turn 4200 would like to be 4600 or 4700 rpm. I hear the quad 4 is better in high chop mirage is better in flat water. Any info will help.
08-07-2002, 05:13 PM
#3
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My Cuz had a 35 Fountain w/Twin HP500's and 27 Mach Sterndrivers...went to 28 Quad 4's and picked up rpm's and speed. But we all know Mach Sterndrivers make great jetski anchors
and that's about all
and that's about all
08-07-2002, 05:26 PM
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My 29 Fountain is very hard to plane with a 25 Mirage, but gets on plane easily and runs nicely at 5200 rpm WOT with a 24 Hydro. (Top end speed is a bit slower than I'd like though.) On the other hand, I had a blade fail (cracked, didn't come off) on the Hydro without having hit anything.
08-07-2002, 05:38 PM
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Cord
1989 Formula 272 7.4 330 hp 300 hr on the hole package.
The boat is real nice I just don't have any top end 55 mph at 4200rpm. The more I trim the bow just porpise?? the hole shot is ok even with a full load of people. add a littel trim the bow comes up a little,the hull loosens up alittle and thats it no more speed just 55mph. 25p has to be to much prop.
Russ
1989 Formula 272 7.4 330 hp 300 hr on the hole package.
The boat is real nice I just don't have any top end 55 mph at 4200rpm. The more I trim the bow just porpise?? the hole shot is ok even with a full load of people. add a littel trim the bow comes up a little,the hull loosens up alittle and thats it no more speed just 55mph. 25p has to be to much prop.
Russ
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08-07-2002, 10:06 PM
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I'm thinking that the hydro won't be your prop. My guess is that you are going to want more bow lift than what that prop will provide. Does anybody know if there is a 21" mirage? I'm not sure where the numbers end. With the 330 you can spin it to a point just under 5000 rpm-but NO MORE. I don't think a 23" mirage will get your rpms to that point. You could also try the revolution 4. It's basically the Bravo 1 but in the smaller sizes and pitches.
08-07-2002, 10:07 PM
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BTW-I broke the ear off a hydro prop. I had the prop for 3 hours when it let go. My theory was that the prop was surfacing and it cause the prop to work harden. This proably won't be a factor on your boat.
08-07-2002, 10:31 PM
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Russ -- I'm going through the same thing right now. was running 25 mirages at 4200rpm --tried hydros 21's @5200 ----now mirage plus 23's @ 5100. I was very surprised that 2 pitches would bring the rpm up 900!! That also brought me to 60 mph, rather than 52 with the 25's. I might try the 23 hydros next, would like to be in the 4800 range. It's amazing how much difference there is in the bow lift, and where you have to run your trim at, between the 3 and 4 blades! Good luck
