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Registered Member #1845
Joined: Fri Dec 05 2008, 05:38AM
Location: California
Posts: 211
I have a question about the effectiveness of making a primary coil more conical, in order to get higher coupling. Let us assume that there is a spark gap coil that makes 40 inch sparks with a flat spiral coil. What kind of spark length increase can one expect to achieve if the primary is changed to a 45 degree conical coil.
Does making the primary coil more conical really offer very much of an increase in spark length with a spark gap coil? (or only minimal,,, say 1 or 2 inches, from the original 40) Anyone done experiments on this?
Registered Member #1799
Joined: Thu Nov 06 2008, 02:20AM
Location:
Posts: 23
It simply increases coupling. It will only increase spark length if you cannot achieve proper/high enough coupling with a flat primary.
However, it does require more wire/tube to achieve the same inductance and this can be viewed as a small inefficiency in terms of ohmic resistance. Of course the real issue is primary/toroid insulation/distance.
Registered Member #1845
Joined: Fri Dec 05 2008, 05:38AM
Location: California
Posts: 211
It will only increase spark length if you cannot achieve proper/high enough coupling with a flat primary.
This brings up another point that I was curious about. I used to think that "the higher the coupling,,, the better" But now I understand that this is not neccesarily the case. I saw a coil on a website where the secondary was raised, and this led to a spark length increase. Since raising a secondary lowers coupling(I'm 95% sure that is correct), and the spark length grew, this shows that higher coupling is not always better.
I'll have to look at richies burnetts site,,,, I believe he had information about varying the coupling, and how it affects the system. If I remeber correctly, all an increase in coupling does is allow the energy transfer to occur faster. It doesn't neccesarily mean that MORE energy will be transferred into the secondary.
Registered Member #1799
Joined: Thu Nov 06 2008, 02:20AM
Location:
Posts: 23
SteveC wrote ...
It will only increase spark length if you cannot achieve proper/high enough coupling with a flat primary.
This brings up another point that I was curious about. I used to think that "the higher the coupling,,, the better" But now I understand that this is not neccesarily the case. I saw a coil on a website where the secondary was raised, and this led to a spark length increase. Since raising a secondary lowers coupling(I'm 95% sure that is correct), and the spark length grew, this shows that higher coupling is not always better.
I'll have to look at richies burnetts site,,,, I believe he had information about varying the coupling, and how it affects the system. If I remeber correctly, all an increase in coupling does is allow the energy transfer to occur faster. It doesn't neccesarily mean that MORE energy will be transferred into the secondary.
Correct, I was not implying a higher coupling is always better. Simply that you'd only use a conical primary to increase coupling if you're coupling was not high enough (aka too low).
The time it takes for the energy transfer to complete does dictate how much is transferred because the sparkgap is a time-related loss. Heating loss due to resistance is (I^2)R=W=J/s (energy per second). Having a higher coupling can make it harder for the sparkgap to cease conducting though. So although energy transfer occurs quicker it transfers back and further multiple times and the total time it spends in the primary is greater.
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primary coil's effect on spark length
