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# Re: [TCML] Need some advice on 150kva sgtc

It would be intersting to see how arc length would improve if you lift the coil up a bit off the ground, and increase the BPS rate.
```Coupling is also pretty important on big coils...
Have you experimented with increasing the coupling at all?

Carlos

On 2015-01-02 08:13, vam@xxxxxxxxx wrote:
```
```You got my message spot on Carlos.
```
The coil produces constant streamers about 20- 23 feet, or 6 - 7 meters.
```It's very impressive. But i did make a  coil with 1 m winding length
before, producing 3 meter sparks at 20 kw.
so i expected around 10 meters with this set up. but 7 seems the max.

```
```Big machines like this are typically less efficient than there smaller
brothers and sisters.
I have not taken the time to run the numbers on the info you provided,
but if the system is well balanced and in tune and pulling 40kva, I
would expect to see 20-25 foot long arcs at minimum.
```
The height of the coil will also be a limiting factor to some degree...
```
```
I assume from your question that you are not happy with the performance
```or it did not meet your expectations?

Kind regards,

carlos

On 2015-01-02 06:03, vam@xxxxxxxxx wrote:
```
Me and some friends built this coil. It's total height is 5 meters. the
```donut is 2,60 by 60 cm. the coil is 65 cm dia with 1200 turns of
2.5^2mm
installation wire. about 3.6 meter winding length. Cap, DR resonance
100nF, 80kv 4 in parallel.
```
We feed it with a 180kva 10kv yz5 transformer. Rectify the lot to 16kv.
```ballast ensures 32kv on the cap. at 200 bps we draw 50-60 amps per
fase.
so roughly 40 kw. Max bps is 700.
Now the question. What kind of spark length should be possible from
this
coil?

Picture of the coil.
https://www.facebook.com/photo.php?fbid=671287332969054&set=a.110176789080114.14601.100002633816524&type=1

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```

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