Re: Any suggestions for more spark length

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

Original poster: "Bob (R.A.) Jones" <a1accounting-at-bellsouth-dot-net> 

Hi Criss,

Assuming its all wired up correct.
Check if its power arcing, that can be a major problrm with mots. The gap
will sound more like an arc welder than the crisp cracks should be getting.
If it is power arcing your 110 ohms resistors should be getting very very
hot as most of the power will be going in them.
Check your tunning.

Bob

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Monday, September 27, 2004 7:21 PM
Subject: Any suggestions for more spark length


 > Original poster: "Mudford, Chris" <chris.mudford-at-agresearch.co.nz>
 >
 >
 > Hi all
 >
 > I need some hints as to where my power is going?
 >
 > Coil specs are:
 >
 > Power supply:  2 series mot with doubler having 1.05 uF in each HV leg, 2
 > series MOV diodes with by pass caps between legs and 110 ohms in each
 > output leg.  There is a safety gap to ground (CT of two transformers) from
 > both HV outputs.
 >
 > Spark gap: 5 pipe linear satic gap (2 pipes on bottom, 3 on top, separate
 > the top further from bottom to adjust gaps)  Total gap ~4 mm.  Parallel to
 > supply.
 >
 > Capacitor: 10 seriesed WIMA FKP1 (0.068 uF, 1600 DC, 650 AC) with 7
 > parallel strings.  33 MOHM bleeder across each cap.  Connects to inner
turn
 > of primary and spark gap.
 >
 > Primary:  14 turns of 4.8 mm refrigeration tubing spaced at 4.8 mm as flat
 > spiral.  35 mm space between secondary and primary inner turn.
 >
 > Secondary:  90 mm diameter wound at 540 mm length for 6:1 ratio for 1630
 > turns (0.28 mm wire, 0.32 mm including enamel).  Bottom turn of secondary
 > ~30 mm above primary.Toroid ~90 mm above last turn of secondary (to centre
 > of minor toroid diameter).
 >
 > Toroid:  Spun aluminium 50 x 180.
 >          Silver tape toroid 80 x 600.
 >
 > RF ground:  Short length of steel into ground which I clip to
 >
 > With the small toroid it is producing ~14".  I quickly built the bigger
 > toroid hoping to get rid of the multiple streamers with the smaller
 > one.  But, was still getting 3-4 streamers into air at ~18".
 >
 > Things I think are poor.  SPARK GAP, TOROID, COUPLING, RF GROUND, POWER
 > FACTOR.
 >
 > With a supply like this how does one approach power factor.  The mains
 > supply lead is getting warm.
 >
 > Hope all you guru's can have a think about this and give me some ideas.
 >
 > Cheers, Chris (NZ).
 >
 >