Nitro/Merc 90 Prop Help

I have a 1999 Nitro Bass Boat with a 12 1/2" x 23P aluminum prop (Wot) 5000-5500 rpm the boat will run 5400rpm at about 54mph. l am pleased with the aluminum but I have damaged  a new one that I just put on, I do have a Lazer II 13 1/2" x 24" High Rake prop , that I tried and did not like the prop it made the foot klunk at low speeds (just of Idle) like the foot was damaged and was a dog off the line and did not want to do well until upper speeds, I like to cruise, fish, and run fast but running fast is not my top priority, low to mid-upper range speeds is where I will be running, I am looking at a 13"x 22P High Five will this still give me decent bow lift at upper speeds.

I like to cruise about 40-45mph around 4500 rpm. Do you think a high five will work well all around?   Thanks,



I think you will love the Hi five as it is perfect for the uses you described. Give it a try … the “rumble” is part of the stainless prop’s weight and there is not much you can do about it.




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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