Hydromotive Quad IV RPM Question

[blackhawk]

I don't have a Donzi anymore but I know all these props are on a lot of 22s.

I am running 5000 rpm with a standard Mirage, 4800 rpm with a Mirage Plus and 5100 with a Turbo 1 25 at WFO. I am thinking about trying a Quad IV so I can run harder in the sloppy water. Should I stick with a 25 or go down to a 24 to compensate for the larger diameter and extra blade? I'm thinking the 24 would be the better but I'd like to get some opinions.

Stock 502 Mag(415hp) and X is at 17".

Thanks

[RickSE]

I ran Poodle's labed 23P Hydro against my labed 25P Mirage+.

The Hydro was bumping the limiter just past 5,400 RPM with a little more throttle left. Trim was not real agressive.

Later in the day my Mirage+ ran 5,300 RPM @ WOT with agressive trim.

I know this isn't really much info but if I run a Hydro I'll probably run a 24P.

[Ranman]

I run a little north of 5000 with a 25P Mirage+ (5150 on the VDO) and a little south of 5000 on the VDO with a 24P Hodro Quad IV (4900). If you're only turning 4800 with a 25P M+ I would expect the Hydro to be lower.

What interests me is that my boat ran almost exactly the same RPM's with a M+ or a Turbo One (25P). You're reporting quite a difference.

Botom line: If you think you can pull a 25P three blade well you'll want to try a 24P four blade Hydro, maybe even a 23 if your revs are at the low end of the range.

[Barry Eller]

I turn around 5000 with a 23' QIV. 4800 with a 25" Ballistic. King Cobra drive has a 1.43:1 ratio, so your numbers may be different. I need to find someone that has installed a nosecone to the lower unit to see if it helps.

With the Hydo on, I can pull trees out of the ground!!

[RickSE]

Isn't the Turbo a smaller diameter then the Mirage+? Result being that it would spin at a higher RPM with the same power and pitch.

[blackhawk]

I'm with Ranman, the RPM difference netween the M+ and the Turbo are surprising. Were they both purchased new, or used?

Two things, I could trim the Mirage + to 5000 but it was no faster. My boat needs VERY LITTLE positive trim.

Also, the Turbo I have is an older Turbo 26. When I called Turbo they said it would be the equivelant to a new Turbo 1 25. So, I am just going by what they said. The M+ came with the boat.

[turbo2256]

I don't have a Donzi anymore but I know all these props are on a lot of 22s.
I am running 5000 rpm with a standard Mirage, 4800 rpm with a Mirage Plus and 5100 with a Turbo 1 25 at WFO. I am thinking about trying a Quad IV so I can run harder in the sloppy water. Should I stick with a 25 or go down to a 24 to compensate for the larger diameter and extra blade? I'm thinking the 24 would be the better but I'd like to get some opinions.
Stock 502 Mag(415hp) and X is at 17".
Thanks

I have a 23, 24 and 25 hydro All for sale.

[blackhawk]

Isn't the Turbo a smaller diameter then the Mirage+? Result being that it would spin at a higher RPM with the same power and pitch.

Yes the Turbo is a 14.25 and the M+ is a 14.5 but it really shouldn't be 300 rpm difference. But, like I said I could trim the M+ to 5000 but I quit gaining speed after 47-4800. :confused:

[turbo2256]

At the speeds you are running, a nose cone is not needed. Indeed, it will most likely cost ya mid range.. Might improve handling though...
I'm with Ranman, the RPM difference netween the M+ and the Turbo are surprising. Were they both purchased new, or used?

Those props can be quite different and still be within spec's compaired to a Hydro.

[blackhawk]

I have a 23, 24 and 25 hydro All for sale.

Sent you a PM! :D

[turbo2256]

PM ed ya back call