Doctor Drivel wrote:

"Dave Plowman (News)" wrote in message
...
In article ,
Doctor Drivel wrote:
Knob, again..."The Yo-Mobile is driven 100% by electric motors. The
speed of the engine doesn't have to fully correlate with the driving
wheels."

So just the same as many automatic gearboxes? Like a CVT?

No. There is NO mechanical linkage.

So? But I suppose you think a generator/control/battery/motor combination
100% efficent?

You really do not know. This is a brand new "new design" engine tweaked
to suit.

So new, in fact, that people have been trying and failing to get engines
of that design to work reliably since 1910.

The fact remains that if your engine generates 40 horsepower, you
*cannot*, on average, get more than that out of the other end of
whatever means is used to transmit that power to the wheels. You *can*
get a higher peak power if you use a battery as a reserve power source.
Of course, to recharge the battery, you need to take some of the power
from the engine, reducing the power available at the wheels for normal
running. So, you can accelerate quickly up to a steady speed, but that
speed is less than it would be if the vehicle were directly powered by
the engine without the complication of the batteries (Parasitic weight,
which also makes it harder to accelerate, and needing 15 kilowatt-hours
to replace the 10 kilowatt-hours you've just extracted.), control gear
(Which alway wastes some power), the generator and motor combination,
which in these sizes is less efficient and heavier than a normal gearbox
and transmission.

--
Tciao for Now!

John.