I just did a bit of playing with MathCad.

If we assume an ultralight can fly on 10HP, and we want at least 1/2 Hour,
then I get 300# worth of Lead Acid batteries (4 85 A*H Deep cycle
batteries), or 56 # worth of Lithium Ion batteries, in an unknown
configuration.

The lead acid batteries, along with 100# for a 10 HP motor and prop, weigh
more than an ultralight can carry.

The Lithium Ion batteries are not available off the shelf. So buy a couple
hundred laptops, and improvise!



wrote in message
...
On Dec 23, 11:12 pm, "Morgans" wrote:
wrote in message

...
That there have been one hour and 100 miles flights made with the old
Li-Po
batteries.

Even if it's half that, electrics would be viable.

In what aircraft was that?

None, at present.

Hmm.

I don't think 10 fold would do the trick. The math shouldn't be too
hard to show one way or another. P = IV. Too much ampere draw to move
a plane.