Formula 223 prop tests
After the longest winter in my life, splashdown date was tuesday for some prop testing. As some of you know, I bought a 223 last December and got to go out twice before winterization. The boat saw a top speed of 68.7@5200 with a Hydromotive 4-blade and about 50 gallons of gas. The motor is a Merc 454/425 with a little bigger Ultradyne cam and Gil exhaust. I'm thinking about 460 to 470 HP. The Mercury website suggested a Mirage Plus 25P so I got one to try. Here is the results. Any help would be welcomed
All speeds are GPS- about 3.5 less than the speedo reads 25 Mirage Plus 3000 RPM = 40.7 3500 =49.8 4000 =58.6 4400 WOT =64.2 23 P Hydromotive 4 blade 3000 RPM =35.1 3500 =43.7 4000 =52.4 4500 =61.3 5000 WOT =64.7 Tests were done with a full tank of gas for both props (79 Gallons) and just myself onboard (200 lbs.) Did the heat (97) and 30 gallons of fuel rob me of 4 MPH and 200 RPM's? :( :( |
Yes.
We had a 223 with the old 454/Alpha, so we did not do anything to the engine. It ran about 58-60. I ran best with a clever style prop. mike |
I have a cleaver prop that I am going to try out this weekend. I've been running a 24" Turboprop. I have heard the cleaver will help with the tendency of my boat to heel sharply to port. It is a 20SC with a 330hp/5.7. The cleaver is a 23", but it has a larger diameter.
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The 25P Mirage was surely too much prop.If I turned that @4400, what should I turn a 23P?
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I was turning 4500 with the 24 turbo, that was without trimming. I couldn't trim it at all, or it would start porposing like crazy.
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The Merc site also recommended the 25 Mirage Plus for my boat, which I am quite sure would be too much.
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97 degrees will rob you of about 8% HP
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The 25P Mirage was surely too much prop.If I turned that @4400, what should I turn a 23P?
Does anyone know what the rule of thumb is on that. I seem to remember that it was 300 RPM's for 1" of pitch. Is that correct? If thats it than I'm thinking a 23 Mirage would take me to 5000. How many additional RPM's could I get from labbing? I want to get 5200:) Thanks, Craig |
on a good lab job, you should pick up 300 rpm!! notice i said good!!!!
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Who do you recommend for labbing?
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