Need help about Goldpic Coil

[solmer2]

Hi, I've built a Goldpic Pulse unit and works well with the standard 27 turns coil but I need info about making a square 50cm x 50cm coil. I've read some articles and info about monocoils but my knowledge is not enough to figure the numbers of turns for the desired coil... I've read at Trebors page (Goldpic creator) that the coil is made of 27 turns (AWG 0,5) for a 7 1/2" or 20 Turns for a 10" coil and I wonder if I can build a 50cm x 50cm using a ratio calculation:

if 7,5 = 27 tunrs and 10 = 20 tunrs then 50= 7 turns

Thanks in advance for the help.

Good Luck and happy Finds !!!!