The forever ongoing upgrade

Hi all:
	Since our revamped Tesla coil is up and running, it's going back to 
the high school for more demo's.  My son's science teacher is becoming a fan.
	While the coil is out of the house, I'm going to build a new 
secondary.  I have some 4" PVC pipe and 1/2 pound of 22 gage wire.  What I 
can't decide is weather to build a 16" or a 20" coil.  And do I have enough 
wire for the task?  Any comments would be appreciated.

Rich Sebzda
Your friendly neighborhood catscan repairman.