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I have a 1999 Alert 17 with a Yamaha F70LA on it with a Yamaha Performance Series Stainless Steel 13.25 x 14 prop mounted all the way up. From my experience what Tom Clark says is spot on.The boat handles great and with me alone,flat lake,trimmed up with about 12 gallons of gas I can get very close to 38 mph and with a slight chop 36.7 mph all day . Thanks again to Tom for helping me to set this motor up,my dealer said I would be back to have my motor lowered and was suprised when I told him it performed perfect.