"mad8" wrote:

James Robinson wrote:

The batteries weigh 900 lb., and put out 75 HP for an hour. You
wouldn't get too far on that in a C150.

you would save a noticeable amount of weight from not needing to carry
fuel (avgas is something like 6lbs per galon, so that would be approx
300lbs "offset" (not saved, but shifted to battery cell weight)
also, no oil (so thats a few more pounds)
and electric motors are fairly light compared to internal combustion
blocks

Yes. If you saw my other post, I added up those numbers. You remove a bit
more than 400 lb total with the gasoline engine, and add more than 1000 lb.
with the batteries and electric motor, for a net add of 600 lb. That is
more than the aircraft can handle.

You also drop from a 4hr 30 minute endurance to a 60 minute endurance.

You really can't beat the energy density and low cost of liquid petroleum
fuels with today's technology.