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  1971 Outrage 21 Propeller Question

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Author Topic:   1971 Outrage 21 Propeller Question
John W posted 01-25-2004 08:47 PM ET (US)   Profile for John W   Send Email to John W  
Well, I finally got out on the water in my new-to-me Whaler. Wow! The boat flies with the 1999 Johnson 150 on it! The boat comes onto plane with no bow rise and seemingly no effort on the motor's part. I didn't have my GPS so I don't know the speed I was running, but it was fast!

The boat has an aluminum prop on it now. I would like to upgrade to stainless, if for no other reason than it will be more durable when I (inevitably) brush a sandbar on the flats. The boat topped out at 5600 rpm's with the aluminum prop on there now. (The boat would cruise nicely at 3000rpm's, and stay on plane at 2800...I was thrilled!) The problem is, I can't find any numbers on the prop to tell me the pitch and/or diameter. My questions: Does anyone have any prop suggestions for this boat/motor combination? Does anyone know how I can figure out the pitch of what I've got?

Thanks

John

jimh posted 01-25-2004 11:40 PM ET (US)     Profile for jimh  Send Email to jimh     
To figure out the propeller pitch, use the Propeller Calculator. For the SLIP number, use a number from 6 to 10 percent.

http://continuouswave.com/cgi-bin/propcalc.pl

Instruction for use are included in the calculator. Specific instructions for how to deduce PITCH are provided.

lhg posted 01-26-2004 01:31 PM ET (US)     Profile for lhg    
You should seriously consider a performance style SS prop for the boat, something like an OMC Raker, Merc Vensura 4/Mirage Plus/Revolution 4 (lowest pitch available is 17") or aftermarket Stiletto/Rapture.

Clark Roberts recently told me that his 21 Outrage will run 55-56 with a Merc 200 EFI and 19" Laser II prop.

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