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Experiments in boat speed...
"Shortwave Sportfishing" wrote in message ... When I finally got a chance to run the Ranger's E-TEC yesterday, I was a tad disappointed that I couldn't get the rpm's up over 4900. So having the time to do some experimenting, I went back to my friendly long time dealer and we decided to change the engine position one notch with no noticeable effect. So, we changed props to a 14 1/4, 21 three blade and there wasn't much of an improvement - it handled a little better, but no increase in speed. Standing around the shop, scratching our collective heads, we noticed a mechanical jack plate sitting in the corner that the owner had taken off a Stratos on a E-TEC repower. The light bulb went off at the same time - scramble around, install the jack plate, engine and took it out. Got plenty of RPMs, but the speed wasn't quite what I wanted. Switch the three blade to a four blade 21 pitch and voila!!! Problem solved. Pictures here. http://www.swsports.org/images/P8033238.JPG http://www.swsports.org/images/P8033240.JPG http://www.swsports.org/images/P8033241.JPG Glad you solved the problem. From an engineering standpoint, how did the addition of a jackplate improve the top end? I am not familiar with jackplates. |
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