RE: (ET) newbie

[Larry Elie <lelie ford com>]

Steve, I'm puzzled here....

In your reply to Jeff, you mention...

;    4.  Except for light use the 3 hp golf cart motor will probably be too
;light.  Light use would be mowing so long as the mower deck had its own
;motor set.  Even the GE E15 and E20, which had 1.5 kW and 1.8 kW constant
;duty traction motors used separate motors for accessories.  If you simply
;replaced the gas motor with an electric you'd have to size it for
;simultaneously powering the traction and accessory loads.


I agree with your whole post, but 760 Watts mechanical is 1 HP, and with a 
normal 
conversion efficiency, a good electric motor will do 1 Mechanical HP on 
1000 Watts or 
1 kW.  I do not know the designed duty cycle for the GE, but might 1.5 & 
1.8 kW be 
a bit wimpy?  Or was it supposed to be 15 and 18 kW?  

BTW, for a good belt-controlled gear transmission, the efficiency is 90 to 
95%, for a 
hydrostatic it is 65 to 75%, the losses are to heat.  A hydrodynamic 
(car-type) automatic 
is about 80 to 85%, and a few were used on large Case farm tractors in the 
1950's.  The 
efficiency penalty is why you never see a hydrostatic on anything but 
garden tractors or 
bulldozers, where the speed control ability outweighs the efficiency 
penalty because you 
can get your job done quicker.

Larry Elie