My son was given a "free" homemade tunnel hull/hydroplane -- just under 10 ft long. We are trying to figure out what to power it with. It ran well with a 9.9 Mercury (recent vintage), but was a little tipsy when not moving. It did not seem overpowered when running.<br /><br />I'm told that pretty much all 10 HP's weigh in at 74 lbs -- is this true? And also that 8HP's are the same weight also.<br /><br />Any recommendations for a motor that would be any lighter? Really need to buy used to keep this "free" boat from breaking the bank (controls are going to cost another $500, I'm told).<br /><br />Your thoughts and suggestions are appreciated.<br /><br />Thanks,