225 HP Speed and Pitch

speedog

Recruit
Joined
Jun 30, 2009
Messages
1
1994 Robalo 2120
1994 Mercury 225 Saltwater
50 gallons fuel
15 X 17 three blade prop
Runs 26 mph at 4,500 RPM

Does this make sense?
 

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
28,827
Re: 225 HP Speed and Pitch

I think that is pretty slow for that combo. My 21 foot Dual Console with a 150HP Johnny will hit 37MPH. Are your readings from a GPS? Do you have the motor trimmed up to maximize speed? Do you know what your gear ratio is? we can use the prop calculator to see what the slip is. It would look to be real high.
 

Faztbullet

Supreme Mariner
Joined
Mar 2, 2008
Messages
15,938
Re: 225 HP Speed and Pitch

You got motor/electrical problems...the ratio (1.62 or 1.75) would show a 30% slip factor and the rpm would be a whole lot high than 4500
 
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