Re: Vtop vs coil length
It's more total spark length than voltage although they are related. Most
secondaries with two internal disks can withstand up to length = total spark
length / 3. (or 3 times sec coil length for spark length). This assumes a
large toroid on top --- considerably less if smaller toroid is total spark
length = 1.5 x sec coil length. Beyond this and you start pushing the
envelope and failure is sure to occur at some point. For reference 1 MV is
equal to a spark length of 9 ft. through normal air at STP (this measured
across 1/2 inch dia rod gap).
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Monday, June 07, 1999 4:05 AM
Subject: Vtop vs coil length
>Original Poster: Finn Hammer <f-hammer-at-post5.tele.dk>
>Can anyone pls tell me how to calculate the voltege that a secondary is
>able to withstand.
>My present coil is 32 " long, and puts up with round 600 kV, but I am
>considering to exeed 1 MV on the next big coil I build.