Re: Optimum turns on sec of classic type Tesla coil

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: Mddeming@xxxxxxx 

In a message dated 6/9/06 12:42:30 P.M. Eastern Daylight Time, 
tesla@xxxxxxxxxx writes:
Original poster: Mike <megavolts61@xxxxxxxxx>

Why not try changing the aspect ratio?  it's fairly simple to use
the same length of wire and change the aspect ratio.....then the DC
resistance is constant.   It's  simple to find the point at which the
inductance is at a max.   It's even easy to determine, with a given
topload the aspect ratio that causes the LC frequency to be equal to
the quarter wave frequency....which might wind up being the best
configuration of a coil.
Mike

Hi Mike,

    For a given length of wire, the maximum inductance, 
unfortunately, occurs when h/d=0.45.
In most cases, this ratio is too small to be of practical use. For a 
flat spiral the Max inductance occurs when b/R=8/11, where b = 
r(max)-r(min), and R= [r(max)+r(min)]/2. The derivation paper is in 
the archives somewhere. Check under Maximizing Inductance.

Matt D.