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Author Topic:   1979 Revenge V-22 with 2004 Johnson
steelhead5 posted 04-16-2015 12:57 PM ET (US)   Profile for steelhead5   Send Email to steelhead5  
I finally sea-tested the 1979 Boston Whaler REVENGE 22 I bought last August. For those interested in going with a Suzuki four-cycle outboard engine on a REVENGE 22, here are some performance numbers from my test with a stainless steel propeller [using a 2004 Johnson four-cycle outboard engine of unknown power that was probably a re-badged Suzuki engine--jimh]:

3200-RPM 18-knots
4000-RPM 30-knots
5100-RPM 41-knots.

I just got the FloScan [fuel flow instrument] re-wired and working properly, and I will add fuel usage numbers later.

Teak Oil posted 04-16-2015 09:25 PM ET (US)     Profile for Teak Oil  Send Email to Teak Oil     
What horsepower?
jimh posted 04-17-2015 12:32 AM ET (US)     Profile for jimh  Send Email to jimh     
Are your boat speed numbers really in nautical miles per hour? How were they measured?
steelhead5 posted 04-17-2015 10:31 AM ET (US)     Profile for steelhead5  Send Email to steelhead5     
Big duh on my part. This is the 225 hp Johnson made by Suzuki. Speed measured by GPS and was in knots. As I use this boat mostly in the ocean all the distances to target locations are give in Nautical miles.

The boat also has a paddle wheel on the transducer but I feel this is not accurate at high speeds.

jimh posted 04-17-2015 11:38 AM ET (US)     Profile for jimh  Send Email to jimh     
Converting the boat speed to MPH, I get

3,200-RPM = 20.7-MPH
4,000-RPM = 34.5-MPH
5,100-RPM = 47.2-MPH

That is great top speed for a Boston Whaler REVENGE 22 with 225-HP.

jimh posted 04-17-2015 01:42 PM ET (US)     Profile for jimh  Send Email to jimh     
It is often useful and informative to give details about the propeller that was used, including the diameter, pitch, manufacturer, and model.

Performance data from saltwater testing may produce better speeds than freshwater test data due to the difference in density of the water--saltwater is more dense than freshwater--and sometime from temperature of the water. Tests in cold saltwater tend to have better speed results than tests in warm freshwater.

Air temperature also affects performance, so it is also interesting to give some details of the air temperature during testing. Testing in cold low-humidity air produces better results than in warm humid air.

With my own boat, I have see a variation in top speed of about 5-MPH based on testing done in very cold air and cold water compared to testing done in hot, 90-degree air, and warm water.

Speed is always in inverse proportion to weight, so boat weight is a big influence, too. For that reason it is also informative to mention something about the added weight onboard, such as fuel volume, number of people, extra gear, and so on.

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