"James M. Knox" wrote in message I haven't done the
brake calculations, but I *think* (back of the hand calculations) that the
amount of power generated stopping the plane on the runway and taxiing in
is small enough that even a "fully charged" battery can easily absorb it.

The electric motor on my hybrid car is 6 cm thick and the diameter is larger
than some homebuilts' tires. It's rated for 10 hp and it's hooked into a 144
volt battery which weighs more than I do. The motor goes into regenerative
mode for braking. It recharges the battery in quick order, but it doesn't
stop the 2800 pound car very well. Based on this, I'm inclined to think that
you will still need traditional brakes.

D.