cyborgkiter
Cadet
- Joined
- Dec 5, 2017
- Messages
- 10
Hi. I have an 8hp 2-stroke yamaha with 8.5 x 7.5 prop on an inflatable dinghy. I don't have a tachometer handy but there is very little difference in RPMs between half throttle and WOT when the boat is fully loaded. When it is just me with little gear, it moves fine and I can hear the engine achieving high RPMs, but add another person and the usual gear and the engine can't rev up much at all and we snail away.
If I put an 8.5 x 7" prop, will it make a difference? Online estimates say 200rpm per inch of pitch, so that would be 100rpm, which is negligible. I didn't see any other prop options for this motor. Thanks for your help.
If I put an 8.5 x 7" prop, will it make a difference? Online estimates say 200rpm per inch of pitch, so that would be 100rpm, which is negligible. I didn't see any other prop options for this motor. Thanks for your help.