Gosh Danny, don't have a tach. Speed with two heavy adults and moderate load is 28.5 MPH. The problem is if you strap a layout boat accross the gunwhale and add four dozen heavy burlap decoys plus guns, etc., she wont quite get on step. I have no problem changing props whenever the situation calls for it. So a special prop for those days with an extreme load might be called for. In that case would it be best to go with specialized slow pitch aluminum for super heavy load and a premium stainless for better overall performance with a typical moderate load in fishing situations? Or, is there a stainless version that would cover the gambit as described above with top end as a secondary consideration?