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Jon and V Boat Conversions & Modifications
My 2010 tracker 12Ft project Jon with 40 HP evinrude (1975)
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<blockquote data-quote="fishshtick" data-source="post: 140131" data-attributes="member: 1992"><p>It's definitely dangerous to put that much motor on such a short AND narrow boat. You can potentially balance out the hull rise with enough screwing around with weight distribution and the motor weight isn't too big of an issue in of itself (its only about 20lb off from a 9.9). However, the shortness and narrowness of the flat hull is likely to make it respond dangerously in turns. There simply isn't enough boat to anchor the motor in a turn if you get that thing going too fast. Importantly, without enough hull width you risk hopping or keeling over in corners and an attempt to correct for that on the fly could send you flipping. Width is what makes those racing boats able to corner at high speeds.</p><p></p><p>You might also have some torque issues. Larger HP motors create more torque at the prop and such a short/narrow boat might respond to it more. You want to be careful about trying to offset that with any fins available on the motor (it it has them)</p><p></p><p>If you keep the boat speed down, you can probably avoid disaster, but definitely govern the throttle somehow to avoid the potential for mistakes with the acceleration. You might find that smart tabs or some other trim tabs could provide a bit more stability and help to get your bow down. They put them on inflatables some times to help with some of the above handling issues.</p><p></p><p>Beyond those thoughts, this is uncharted terrain for me and I hope you take the warnings people have offered seriously. Please be sure you have a properly working kill switch on a lanyard, so no-one else has to dodge your torpedo.</p></blockquote><p></p>
[QUOTE="fishshtick, post: 140131, member: 1992"] It's definitely dangerous to put that much motor on such a short AND narrow boat. You can potentially balance out the hull rise with enough screwing around with weight distribution and the motor weight isn't too big of an issue in of itself (its only about 20lb off from a 9.9). However, the shortness and narrowness of the flat hull is likely to make it respond dangerously in turns. There simply isn't enough boat to anchor the motor in a turn if you get that thing going too fast. Importantly, without enough hull width you risk hopping or keeling over in corners and an attempt to correct for that on the fly could send you flipping. Width is what makes those racing boats able to corner at high speeds. You might also have some torque issues. Larger HP motors create more torque at the prop and such a short/narrow boat might respond to it more. You want to be careful about trying to offset that with any fins available on the motor (it it has them) If you keep the boat speed down, you can probably avoid disaster, but definitely govern the throttle somehow to avoid the potential for mistakes with the acceleration. You might find that smart tabs or some other trim tabs could provide a bit more stability and help to get your bow down. They put them on inflatables some times to help with some of the above handling issues. Beyond those thoughts, this is uncharted terrain for me and I hope you take the warnings people have offered seriously. Please be sure you have a properly working kill switch on a lanyard, so no-one else has to dodge your torpedo. [/QUOTE]
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Jon and V Boat Conversions & Modifications
My 2010 tracker 12Ft project Jon with 40 HP evinrude (1975)
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