Hi - my best educated guess would be about 25 - 30 mphon a smooth calm water surface for your rig. I have a 21' aluminum sport fisherman-walk around w/ a 150 two-stroke and it tops out at 46mph, absolute top speed measured with a very accurate spinning wheel-fish finder and only when trimmed well and on VERY calm water and it only happened once. Usually, it tops at 44.
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