by zimp » Sat Nov 30, 2019 1:01 pm
The new (2016) Yamaha 6ph (1cyl 4stroke) is as quiet as my old (2001) Honda 8HP (2cyl 4stroke) but has some more vibrations.
I changed from the Honda to the Yamaha because of the weight and the drag, as the weight is close to the transom and the drag reduces the speed under sail. The dynamics in waves while sailing (especially pitch) are much better with the more lightweight engine.
The Honda has the exhaust via the propeller, so the diameter of the hub is large. These gives more drag while under sail.
The fuel consumption of the Yamaha ( less then 1 ltr per hour) is also lower. But given the number of hours that we are using the engine this aspect is not that important.
Bert, CC19, #004, s/y Zimp