I first would like to say thanks for responding so quickly to my last
e-mail. I have a 1996 115 Johnson
Fast Track on a 1980 viper, 2.5 inch jack plate, and nose cone (actual hp
is around 140). You recommended 24 or 26 pitch Yamaha drag
prop. Why? How does it
compare to a Chopper or Cleaver? I
want the fastest prop available. Please
help me decide on which prop to buy.
The Yamaha drag prop just works better on the 4 1/4" diameter
gearcase that your V-4 has. The old chopper for the Merc In-line works
good, but the new Chopper II has too much blade area for the 115. An old
style, Mod VP cut, 14" diameter cleaver would probably work, but they
are rarer than the in-line chopper. Cost is also very high for a
"GOOD" cleaver. Kurt Krebs had a rig similar to yours and with a
26 Yam drag prop, the boat ran 7000+ all day long. I ran 77 mph with it
once. This was with a short jackplate like yours with the propshaft
2" below the bottom and no nose cone. The Yam prop planes off better
that the chopper, but the top-end is about the same.
Hope this helps.
Please submit whatever questions you have to IHRTechTalk@yahoo.com. All questions and answers selected will be displayed on this page as they come in. Note: though all boaters are welcome, priority may be given to I.H.R. members. Randy can not be held responsible for any advice given. Though his information and expertise is second to none, he has no control over what you do with your boat. It is up to you to boat safely and act responsibly, and his advice is only to be used as a guidance for your high performance boat/motor of which you are the one responsible for the risks involved.
I.H.R. l History
Pictures l Feature
Article l Tech