In a message dated 1/5/99 4:13:22 PM Mountain Standard Time, tesla-at-pupman-dot-com writes: > According to one reference I have the maximum inductance of a single > > layer solenoid coil occurs when the H/D ratio is 2.46:1. > BIG OOPS!! I mistyped this. This max. inductance occurs when D/H is 2.46:1. Now there's a really short fat coil, huh? Mike