need a new prop 13X19 on boat now but slow

[kcseasprite]

My boat is a 1977 Sea Sprite, tri hull, 17 ft long, weight 1150lbs, motor 1977 mercury 115, weight i think on motor is 375lbs, 2/1 gear ratio, max rpm for motor is 5300-5500rpm, gear, fuel and occupant weight is about 300lbs. What sholud i really expect out of this boat as far as speed? Its kinda slow now withe the 19 on it. I do have another prop and its a 13x21. All reply's appreciated.

 

[steelespike]

Re: need a new prop 13X19 on boat now but slow

You did a pretty good job with the details but::
Without your max rpm and speed can't really tell where your at.
Your not likely to want more pitch (21") And I'm guessing a 17 may be closer to what you need. You shouldn't make any changes without a tach.

 

[kcseasprite]

Re: need a new prop 13X19 on boat now but slow

I'm geting a tach this week and hope to have some number for you soon