yamaha 4hp fuel consumption

[jneale]

Any idea what consumption/range I can expect from a yamaha 4 hp pushing a 1 ton boat at about 4 knots ??

 

[VicS]

Hopefully suitably propped for a displacement hull but do you mean a 2 stroke or a 4 stroke there will be a big difference.

IMHO 4 hp is too small for a ton of boat esp if battling against any weather.


I reckon my 6hp 2 stroke with sail prop pushes my 727 or so kg along a a steady pace in calm conditions on about 1/2 gallon per hour

 

[Seajet]

I had a Yamaha 4hp 2 stroke pushing my ( fairly slippery hull ) 22' 3000lb sailing boat across Channel in calms or motor sailing in very light winds, close reaching is ideal and can make surprising average speeds - which I'd recommend if using the engine.

A good bet is 2.5 hours at near max throttle per gallon with no wind assistance in calm seas, about 4.5-5knots for my Anderson 22 ( a touch more with the 5hp ) ; if really beating into seas it will be considerably less time, use the sails and go on fine reaches if there's any wind - of course in light winds and seas you will see a lot less consumption, but a ball park figure is 2.5 hours per gallon at near full throttle cruising -2 stroke.

It will also depend on your prop', hopefully long pitched for taking a cruiser to cruising speed but able to rev to max performance..