# Re: [TCML] how much wire

```I'd take the surface area of a cone and compare that to the number of turns
it'd take to cover a similarly sized cylinder. Say if your SA of the
cylinder was 30cm^2 and it takes 400T, and your cone SA is 12cm^2 then you
should need (12cm^2/30cm^2)  * 400T = An equivalent wire length of 160T on
the cylinder.

On Sat, Nov 24, 2012 at 2:36 PM, david baehr <dfb25@xxxxxxxxxxx> wrote:

>
>
> Hello,            Figuring  wire length  for a conical coil.  Take
> circumference of  base,... circumference of top , add & divide by two ,
> then use the basic  TPI ??                For a cone 9" bottom , 4" top ,
>  12" high , and approx  400 turns  ,  840 feet should more than do the job
> ?                   Thanks for any help ,  (mathematically challenged )
> daveB   ,,,,   any good heavy build  #22 wire for sale ?
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