No Low End Power

Hi Randy, 

My 88 Venus 225 Merc was turning a 14.5"X 28 pitch quicksilver solid hub chopper. It always had a poor take off but once the nose came down it had good speed, but the RPM was 300 less than WOT specs. I needed more power on the bottom side so I bought a Michigan Ballistic 14.5"X 26 pitch prop. Now the boat labor's bad, and on the low side will struggle just to get up and moving, again once under way the speed is good and now the WOT RPM are very close to 5800. The RPM would come up as it was designed to do with the solid hub but I don't see this with the new prop. The new prop has vent hole's drilled on the leading edge of the blades from factory but they are only about 1/4"dia and I don't have the rev up at take off. Will it help to open them up and allow more exhaust pressure over the blades or did I purchase the wrong wheel?

Craig

 

Craig,

You’re not going to like this but the Ballistic prop is like putting a tractor tire on a Ferrari. It works, but poorly. Eighty-six that prop and get a 25 or 26 small hub Merc Trophy 4 blade. The top speed will be right there and the hole shot is very good if not exceptional. I think you'll be pleased.

Randy

 

 

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.

Thanks,
Mark C.

 

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