![]() With twins you add other factors such as tow-in / tow-out, counter rotating inward or outward, etc. I had guys running 200's and 225's on an 18 footer where I could run off and leave them behind You can gain more by fine tuning your configuration than what 15 or 20+ HP will do.Įngine height, trim, the prop of course, and not just trying different props hoping to get lucky, but on each of my rigs I'll spend a little time, write down my true speed versus RPM, then take the theoretical speed based on gear ratio and pitch against the actual numbers, calculate prop slippage, and adjust engine height, prop cupping, pitch or diameter as needed to get optimal settings.īy doing this, I've outperformed other identical rigs with as much as 50 to 75 more horsepower, I've even been accused of having a 200HP engine with a 135HP Optimax cowling on my previous 18 ft boat lol, light load it would GPS at 56 to 59mph depending on the day / environmental conditions ![]() I wouldn't be surprised to see the same engine plus or minus 10 to 15HP or more on different days.īut it would take allot more than 15 HP to make a noticeable difference, the hydrodynamic drag vs horsepower is an exponential battle that's difficult to win. There are allot of factors if one was to get technical, fuel, altitude, air temperature (cooler air more dense more power, hot air, thinner less power) ![]()
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