Viper Prop Advice

For starters, thanks for your advice.  It is appreciated by all of us with HydroStreams.  My 84 Viper with 76 Evinrude 115, what prop do you recommend?  I had a 13x20 Raker and was turning 6ish, but I read these stories of these guys with similar boats and motors, and they are turning 26s and 28s.  How do they do it?  Do the particular props they are using slip a little more, allowing more prop?  And, what prop do you recommend?  I keep hearing about Srx's and Spinelli's.  Please, I will take any advice you can give.  Thanks in advance.  Ronny Jetmore

 

Ronny,

The set up you have is a good overall one. Every OMC raker I've ever measured is a good 2 inches bigger pitch than stamped. This is why they sometimes run goofy numbers on the calculator. Most of the 26 and 28 props you speak of are some form of cut down V6 prop. They either slip a ton or are not what they are stamped. To run a 28 on a 115hp motor on a viper, would need to be in the 80 mph bracket to be considered a good set up. I'd stick with what you have because any bigger prop set up would be sicker in the low speed part (anywhere but wide open). If you want to experiment, try to find any 22 or 24 Yamaha drag or small Merc chopper props. Both will have to be rehubed though. You will need to get all unnecessary weight out to make any gains. The more you set up for top end the more the boat is weight sensitive. Don't be surprised if you put your buddy in the boat and it is 5 to 10 mph slower. That is why I usually go for the overall set up. With low horsepower (anything under 200) and small boats this is just a fact of life you have to live with. 

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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