Inline Choppers


I have a 1976 Vector with a 1978 Mercury 1150, 115HP and power tilt/trim.  I have the older style Mercury lower unit with the slightly smaller diameter prop hubs.  I wrote to you in April for your recommendations on what pitch and style of prop to use for skiing and top speed.  You recommended a 19P for skiing and "for top end use a 22 or 24 small blade chopper or even a Yamaha drag prop of the same pitch if you can find one."

On Sunday I took your first recommendation and tried out the 19P.  I popped out on a slalom ski great, and the boat had more to go so I expect barefooting will be easy.  Even with four people and a full cooler of beer the boat would do 45mph.  I had just unloaded the passengers and coolers when a Checkmate with a 115HP and a 19P prop appeared.  We raced three times, and I had him on holeshot and top end.  According to his speedo we were approaching 50mph.  Thank you for your phenomenal recommendations!

Would you please clarify what a "small blade chopper" prop is so I can try your top speed recommendation?


Casey O'Donnell


Small blade choppers were used on the old inline motors in the late 70's and early 80's.  They are identified by their 14 inch diameter.  The newer 14 1/2 diameter choppers will not fit the inline gearcase.  If you modify the new prop by removing the weed cutters, it can be made to fit.  Search the net for the old inline chopper as it is faster and works better on your boat.  The bonus is because they are old, they are also cheaper.




Please submit whatever questions you have to  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.

Mark C.


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