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I had a 14ft Grumman with a 48" wide flat bottom Mod V hull back in the 80's, the motor was a 20hp with 9.9hp decals, with two guys in it two batteries, a trolling motor on the bow, and stick steering up front on slight chop with the right prop I got 23mph on the fish finder, which used one of those wheels to read speed. It turned out those were not accurate because when GPS came out, that boat never topped 19.3 mph. even with just me in it.
