i cant afford to buy capacitors for my tesla coil, so im going to try my hand at making my own from sheets of glass and tinfoil. i have several sheets of 8.5"x11"glass. i only need it to be 8.6nF. what im wondering is if there are some formulas that will help me at least get a ball park figure based on area of the glass and area of the tin foil? any help would be appreciated! BTW, ive already tried the salt water bucket cap, it actually shattered while testing it.