Re: [TCML] Still stuck at 36"

["Phil Tuck" <follies@xxxxxxxxxxxx>]

Hello.


Jonathan wrote>>" Try putting the vac on a Variac. In my personal
experience, like I said earlier, max vac didn't get me max spark length. It
was better at around 80% vac."

Yes I have also found a difference. In my case my gap likes the highest vac
setting. If I reduce the suction sparks fall off straight away, so it is not
down to reduced cooling, but obviously spark behaviour in less vacuum.
________________________________

Bart wrote >>"with a single gap, the electrode thermal dissipation has to be
excellent which usually means high air velocity and volume."

Or you can go a bit too extreme! Like this
http://homepage.ntlworld.com/follies/tesla/sucker_gap.html
The electrodes are 7 inches long * 0.75 inch. The three radial fins locate
the electrode centrally and also act as fins to give up their heat to the
airflow. The vacuum is applied to both tubes so they suck against one
another. I can't reverse my vac cleaner otherwise it would be interesting to
compare as has been suggested earlier in this thread.
(The reason for all this over engineering is that they are run in a sealed
box with a single hole acting as an air inlet. This cuts down the noise
significantly.)

Now here comes the odd part. 

Prior to this design I had a central hole in each electrode, but the ends
were dead flat. Following some advice from the group I rounded the ends
while still retaining the holes. This caused an odd effect in that one
electrode was touch warm after 5mins run, whilst the other side was too hot
to touch. I spent a lot of time trying different combinations of putting the
hoses on reversed (left hose to right side etc],  changing the copper
electrodes around in the tube holders, even reversing the connections that
fed the SG (yes I know its AC, but I was desperate) all to no avail. I even
put smoke into the gap! I can only assume the radius on the end was
different slightly and somehow affected the air flow, or maybe opposing
suctions means one overrides the other - I have no idea.

Phil

-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of tesla-request@xxxxxxxxxx
Sent: 27 January 2009 12:53
To: tesla@xxxxxxxxxx
Subject: Tesla Digest, Vol 15, Issue 38

Send Tesla mailing list submissions to
	tesla@xxxxxxxxxxxxxx

To subscribe or unsubscribe via the World Wide Web, visit
	http://www.pupman.com/mailman/listinfo/tesla
or, via email, send a message with subject or body 'help' to
	tesla-request@xxxxxxxxxxxxxx

You can reach the person managing the list at
	tesla-owner@xxxxxxxxxxxxxx

When replying, please edit your Subject line so it is more specific than
"Re: Contents of Tesla digest..."

No virus found in this incoming message.
Checked by AVG - http://www.avg.com
Version: 8.0.176 / Virus Database: 270.10.14/1917 - Release Date: 26/01/2009
18:37

_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla