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  23 OUTRAGE: Speed with 300-HP

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Author Topic:   23 OUTRAGE: Speed with 300-HP
KSFLOORCOVERING posted 05-30-2005 07:45 PM ET (US)   Profile for KSFLOORCOVERING   Send Email to KSFLOORCOVERING  
I just got my first Boston Whaler boat, a 23 Outrage. It has twin Yamaha OX66 150-HP two-stroke engines. With a half-full tank of gas, T-Top, and just me as driver I got it up to 47-MPH. I was turning aprox 5,700 RPM. I have stainless steel props, but I am not sure the kind, pitch, or size. How fast are other 23 Outrages?. Please let me know your setup along with your speed. One person said his 23 OUTRAGE with the same motors and with special propellers would go 55 MPH. Could that be true?
Ed Stone posted 05-30-2005 08:55 PM ET (US)     Profile for Ed Stone  Send Email to Ed Stone     
On my 23 Outrage with twin 135 optis I could only get
about 45 mph with a very light load and the wind in the
right direction. But I did not make it a practice to
operate my 23 wide open.30 to 35 was the average I
would cruise to and from my fishing grounds.
Most of the time my speed was detertimed by weather,
waves and boat traffic.
Ed Stone
aubv posted 05-30-2005 09:52 PM ET (US)     Profile for aubv  Send Email to aubv     
KS,

Our 2001 23' Outrage with a single 225 Opti W/full fuel tank, Full water tank and a couple of people does just over 47 MPH- GPS.


Best of luck with the boat.

aquaman posted 05-30-2005 11:36 PM ET (US)     Profile for aquaman  Send Email to aquaman     
KS,

I have a 1994 24' Outrage which is a close to your hull, run a 250 OX66 yamaha. With a 19" pitch I run 47MPH WOT with 1/2 tank. I would think you should get in the low 50's with twin 150's if propped correctly. You should be able to turn 21"s.

Good luck

jimh posted 05-31-2005 07:45 AM ET (US)     Profile for jimh  Send Email to jimh     
The best way to evaluate stories about how fast other people's boats can actually go is to take a GPS aboard them and measure the speed yourself. This often results in a different speed than reported.

It seems unlikely that special propellers could cause an 8-MPH increase in speed, unless the propellers on your boat are in very bad condition or are not at all suited to the application.

Speed increases in proportion to horsepower by an exponential rate of 0.5. If your boat goes 47 and his boat goes 55, this is a difference in speed of

55/47 = 1.17

This implies a horsepower difference of

1.17^2 = 1.37

To reach 55-MPH you would need more horsepower

300 * 1.37 = 411-HP

If you analyze the boat weight and horsepower, you can make a very accurate estimate of its top speed. For a comprehensive example of how to to just this, see:

Propeller Tests
http://continuouswave.com/whaler/reference/propellerWDSingle.html

diveorfish posted 06-01-2005 07:11 PM ET (US)     Profile for diveorfish  Send Email to diveorfish     
On Boat Test dot com they tested a 23 Outrage with twin135s and a T-Top. It topped out at 50 miles per hour with 19 pitch props. I can’t remember for sure but I don’t think they had a full tank.

My 23 Outrage with twin 135s, a T-Top and 17 pitch props does about 44 in good conditions with two people. With 17 pitch props the top end is lower but my hole shot is virtually instantaneous even loaded to the gills. Out here in the Pacific though, I have yet to find a day where I could go past 34 MPH without some launching and discomfort.

KSFLOORCOVERING posted 06-08-2005 08:49 PM ET (US)     Profile for KSFLOORCOVERING  Send Email to KSFLOORCOVERING     
Thank you very much for the info from everybody. I would still love to hear from other 23 Outrage owners on speed, motor, and prop size.

Thanks
Ben

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