pduquette
Ensign
- Joined
- Jun 22, 2007
- Messages
- 999
Well guys I'm finaly getting the pieces to mesh nicely , so i can give the info on the new Comprop plastic / composite prop I bought .
For a refresher - 1961 mfg oxford , 1980 j 50 2 stroke , motor set back 4 " on homemade jack , one hole up . The aluminum 3 blade 19p prop was maxing out arround 4600 rpm and pushing me and the boat (arround 800# total) at 26 mph . The 4 blade 15p comprop took me to 28 mpg at 5700 rpm The best resluts were achieved with the motor adjusted to the pin closest to the transom .
Even with the increase in speed , I could hear some slip / cavitation so I went home and dropped the motor down then returned to the lake for more runs . There was only an increase in the comprop at this level getting me up to 30 mph the original still fighting to turn at 4600 rpm . All speed read from my Hunninbird GPS . peter
For a refresher - 1961 mfg oxford , 1980 j 50 2 stroke , motor set back 4 " on homemade jack , one hole up . The aluminum 3 blade 19p prop was maxing out arround 4600 rpm and pushing me and the boat (arround 800# total) at 26 mph . The 4 blade 15p comprop took me to 28 mpg at 5700 rpm The best resluts were achieved with the motor adjusted to the pin closest to the transom .
Even with the increase in speed , I could hear some slip / cavitation so I went home and dropped the motor down then returned to the lake for more runs . There was only an increase in the comprop at this level getting me up to 30 mph the original still fighting to turn at 4600 rpm . All speed read from my Hunninbird GPS . peter