"Richard Harrison" wrote:
Twice the velocity factor in a coil requires a wave traveling faster
than light or taking a short-cut around the turns.

I often learn from my mistakes. Where did I err?

The current does take a short-cut due to adjacent coil coupling.
But please note the velocity factor only approximately doubles
from the "round and round the coil" calculation. Even though a
VF of 0.04 is ~double the "round and round the coil" approximation,
it is still 96% away from the VF=1.0 originally asserted by W8JI
which assumes that all the coils couple 100% to all the other coils.
--
73, Cecil, W5DXP