1.72 rude model#50273c<br />2.13 1/4 x 17<br />3.unkown no tach<br />4.72 arrowglass tarpon 15' stick steering tri hull<br />5. no jack plate nor adjustable bracket<br />6. sterns hydro foil<br />7. prop has ding none availible localy for current set up but a 13 3/4 x 15 is.My question is poor old boat is hauling 2 old fat people,2 batteries and fuel tanks and fishing gear... 24mph on gps motor under no strain sounds like (no tach in boat) what would the prop change effect as far as top end?? I already understand there will be an rpm change.also there is no tilt or trim on the boat except for when I convince Maw to pick up the motor or move to the middle of the boat.Any opinions will be greatly appreciated