From: Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: Thursday, June 19, 1997 3:04 PM
Subject: Re: Coil Efficiency
Here are a few figures from the coil charting. I haven't
compiled anywhere near enough data to make these meaningful yet, but
I thought they might be interesting. The coil power figures are best
estimates based on a degree of optimism in some cases. The wall plug
power figures were generally stated.
Wall Plug Power Coil Power (E x BPS) Spark Length
--------------- -------------------- ------------
360W 82W 15.5"
700W 90W 20"
1kW 139W 36"
720W 225W 48"
1.6kW 280W 52"
3.2kW 566W 65"
6kW 2.3kW 84"
5kW 4.4kW 90"
I have more coils than this charted. Unfortunately, in a number of
cases, people didn't provide sufficient information for me to estimate
coil input power and in other cases, didn't provide a wall plug
figure. I left those ones out of the list above. In one case, a
figure of 4" was claimed for a wall plug figure of 250W! I think most
will agree there is plenty of room for better use of power. There are
still a lot of coils not yet surveyed sorry.