An insulated heating element running on electricity heats the hot air balloon. The electricity is received from the electric wire doubling as a tether for the balloon or blimp.
-- pashute, May 21 2019

//Thether// sp. thither, as in thither & yon.
-- pocmloc, May 21 2019


So tethered upwards towards the high voltages?
-- wjt, May 22 2019



random, halfbakery