Re: How should we measure coil efficiency

From: 	Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: 	Monday, July 21, 1997 10:29 PM
To: 	tesla-at-pupman-dot-com
Subject: 	Re: How should we measure coil efficiency

Hi all,
         My two cent's worth on this topic. I am simply after the 
longest and hottest possible discharges for a _known_ primary power
which is _easily_ and accurately measured as Ec x BPS. For a sync or 
static gap system this is very well defined. For an async, scoping 
using a HV probe can give an adjusted figure or a mean consumption 
figure depending on whether one wishes to extract peak based 
performance or mean power performance.
     Forget the transformer type I say and forget transformer losses 
in the gap. I know that this makes wallplug figures meaningless but 
let's face it, they are largely meaningless anyway. If we are to 
extract any meaningful figure of merit for different coils we simply 
have to know as accurately as possible just how much power is going 
into the primary. Failure to do this in the past has led to rules of 
thumb for power vs length that have been counterclaimed one after the 
other by actual working coil designs.
     I am not interested in how far a coil can throw sparks to a 
ground rod with a 100mph gale blowing around it. I am interested in 
how far it can demonstrably reach (even just 10% of runtime) and 
connect under favourable conditions. One of the magical qualities of 
Tesla Coils is the ability "to reach out where no induction coil can 
go". Let's use that quality and impress the hell out of the 
    BTW, congratulations to Bert Pool for his latest magnifier 

What do others think?