--- In electricboats@
>
> Hey Dave, I am intrigued at the prospect that a rated 8 hp electric motor
> can have the same pulling power as a 'rated' 50 hp Diesel motor!
> Now I may not understand what "Bollard Pull" is... but I do understand
> that there are a few things people s-t-r-e-t-c-
> is about Gas Mileage and evidently the other one is the power electric
> motors produce. lol. Ok Dave, I'm only kidding but please help me to understand
> how this can happen? I mean 'Efficiency' can only do so much!
> Is this '300 lb Bollard pull' at startup, full speed or someplace in
> between and if this is true, why am I looking at a bigger motor? A 300 pound
> pull is a lot of pull/push...
>
> So let me recap:
> If you took a 20' line and hooked your sailboat (8 hp) to your friends
> sailboat (50 hp) Stern to Stern and you both opened throttle; Nothing would
> move until either you ran out of electricity or your friends sailboat ran
> out of Diesel.
> -Tom- (not my real name)
>
>
Hi Tom,
If you know your fuel consumption you can calculate the approximate hp produced by your engine which is almost never the same as its hp rating.
A diesel engine will burn about 0.04 gallons of fuel per hp per hour while a gas engine will burn about 0.06 gallons per hp per hour. Now if you consider the efficiency of ICE vs. electric you come up with a total different power requirement for moving your boat.
Consider your car or truck and its engines hp rating. If we used all the power our engines are capable of producing the oil companies would be grinning ear to ear on their way to the bank, AND, the repair shops would be on a first name basis with our bank accounts.
Or we would all be using a horse instead of horse power and our fuel consumption would be measured in bails of hay per day.
Its elementry Mr Watson.
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