dstnlandry
Cadet
- Joined
- Apr 1, 2018
- Messages
- 7
Running a 21'4" suncrusier pontoon with 2006 optimax 90hp (2.33 gear ratio). Estimated weight is 2100lbs based on the current 2019 models.
Origial prop is stainless powertech 13pitch 13.5 diamater. Runs 21.3mph at 6500rpm
Tested today with a aluminum stock mercury prop 15" pitch. Diamater was close to 13.5 from comparing the two but i couldnt decifer anymore off the prop serial number 77343a45 p15. Ran 21.7mph at 6400rpm
According the merc this motor should run around 5500rpm. Seems to me that i am way under proped at 13 and15" but all the prop calcualtors say i should be running closer to 30mph with a 15"
Speed was measured with gps. Im wondering of my tach is off, only basis for that is i assmume the motor would have been blown by the previous owner if it was ran this high for 300hrs.
planning to buy a aluminum prop for top speed. leaning towards testing a 17"p 13.5d 4 blade. Any recommendations? Should i get more pitch? Stick with 3 blade?
Origial prop is stainless powertech 13pitch 13.5 diamater. Runs 21.3mph at 6500rpm
Tested today with a aluminum stock mercury prop 15" pitch. Diamater was close to 13.5 from comparing the two but i couldnt decifer anymore off the prop serial number 77343a45 p15. Ran 21.7mph at 6400rpm
According the merc this motor should run around 5500rpm. Seems to me that i am way under proped at 13 and15" but all the prop calcualtors say i should be running closer to 30mph with a 15"
Speed was measured with gps. Im wondering of my tach is off, only basis for that is i assmume the motor would have been blown by the previous owner if it was ran this high for 300hrs.
planning to buy a aluminum prop for top speed. leaning towards testing a 17"p 13.5d 4 blade. Any recommendations? Should i get more pitch? Stick with 3 blade?
