RE: Tesla Coil Efficiency Test

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Malcolm Watts by way of Terry Fritz <twftesla-at-qwest-dot-net>" <m.j.watts-at-massey.ac.nz>

Hi Terry,

On 17 Jun 2002, at 19:40, Tesla list wrote:

> Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
> 
> Hi Malcolm,
> 
> The input voltage is 120VAC and the variac is set for 120VAC too.  The load
> is 220k Ohms in series with 2.5pF.  The coil is a 9/30 LTR coil with a sync
> rotary gap.  Other detail are at:
> 
> http://hot-streamer-dot-com/TeslaCoils/MyCoils/SmallCoil/SmallCoil.htm
> 
> Cheers,
> 
> 	Terry

As I write this I am *trying* to get through to hot-streamer. No 
doubt others are too ;)  If I'm reading the loading conditions 
correctly, prolonged energy trades will ensue which certainly does 
cause the gap to lose a lot of power. In general and for sparking 
conditions, that load would be representative just some of the time 
unless air streamers are all that's being allowed to happen (and then 
only of a certain length). Again, the domain of validity is limited. 
I think in discussing this we should specify loading conditions when 
positing figures as evidence. For example, the light bulb test 
figures are fine *as far as they go*. They just don't apply to any of 
my coils when run to produce sparks and sparks are all I'm interested 
in. If you loaded the coil up with a steady-state load so that 
coupling became critical, the gap would theoretically lose 50% of the 
energy that actually made it to the primary cap.

Regards,
malcolm

 
> 
> At 01:24 PM 6/18/2002 +1200, you wrote:
> >Hi Terry,
> >
> >On 17 Jun 2002, at 17:11, Tesla list wrote:
> >
> >> Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
> >> 
> >> Hi,
> >> 
> >> I ran the computer model of my small coil today.  The schematic is at:
> >> 
> >> http://hot-streamer-dot-com/TeslaCoils/MyCoils/SmallCoil/SmallCoilSCH.gif
> >> 
> >> The power losses are listed at:
> >> 
> >> http://hot-streamer-dot-com/temp/SmallCoilPower.gif
> >> 
> >> The power into the coil itself is 294 - 59.7 = 234.3 watts and the
streamer
> >> power is 81.4 watts.  The effieciency is about 34.7%.  Not that the gap
> >> eats 40% more power than the streamers!
> >> 
> >> Cheers,
> >> 
> >> 	Terry
> >
> >And the loading conditions (not stated) were ??
> >
> >Regards,
> >malcolm
> >
> 
> 
>