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Re: [TCML] 135ft arc 3ft sphere - Possible? 150 ft spark at oak ridge
There is a limit to how long a spark you can make.
I read an artical once that said Tesla had a tesla coil mounted on the roof of a barn, it made 100 ft lightning bolts across the barn lot then it thundered. NOT TRUE someone made that crap up.
There is a Van de graff in Oak ridge in a 15 story building. You can see the building from 10 miles away. There is an observation room for visitors. They have about 15 Van de graffs in a stack one on top the other. Van de graff is only capable of making certain length spark, I don't remember the exact length but something like 12 ft maximum. So they put about 15 VDGs in a stack each one adds to the total length and the entire stack produces a 150 foot long spark.
-----Original Message-----
>From: Stephen Hiscock <stephenhiscock@xxxxxxxxx>
>Sent: Sep 30, 2009 10:43 PM
>To: Tesla Coil Mailing List <tesla@xxxxxxxxxx>
>Subject: Re: [TCML] 135ft arc 3ft sphere - Possible?
>
>Hi there,
>
>It is implied by DC Cox and Richard Hull it seems that the spark length
>of 135 feet is a myth?
>well just a question regarding this spark length...
>What has terminal size got to do with how far a spark will go?
>I'm not saying Richard Hulls analysis is wrong, but doesn't power
>ultimately determine spark length?
>Wouldn't a 3 feet sphere ONLY determine the initial break out voltage?
>
>Heres what I found already posted on this list on 8 june 2003 and AGREED
>upon by many people:
>subject: spark length vs. power input
>Sun, 08 Jun 2003 21:35:53 -0600
>Original poster: "Dr. Resonance by way of Terry Fritz
><teslalist-at-qwest-dot-net>"
>[.....snip
>d = k' * sqr p
>where d - spark length in inches
>k = coil factor - from 0.5 to 2.0 (for most coils)
>p = input power in watts
>
>k' is dependent on the dia. of the sec. coil as follows:
>k' = 0.85 when sec. dia. is 3-10 inches (small coils)
>k ' = 1.0 when sec. dia. is 11-16 inches (medium coils)
>k' = 1.3 when sec. dia. is 17-20 inches (large coils)
>k' = 1.7 when sec. dia. is 21-36 inches (very large coils)
>k' = 2.0 when sec. dia. is 37-48 inches (super coils)
>.... end of snip]
>
>so from the above snippet and calculations a spark length of 135 feet
>from Tesls coil is VERY REASONABLE
>and certainly within the accepted range of spark length, power input and
>coil k
>
>ie power levels from 500 Kilowatts up to 2 Mega watts for k between 1 &
>2 and if his coil had a k bigger then he only needed a small generator
>perhaps 50 kilowatts.
>But we know tesla had a big generator of perhaps this much power - I
>couldn't find a reference but I'm sure it was 2000 horse power -- which
>is easily big enough
>
>Am I missing something?
>WHAT IS WRONG WITH 135 feet?
>
>cheers..
>
>DC Cox wrote:
>> This is a great book.
>>
>> Rich did a tremendous amount of analysis work on Tesla's work. Rich
>> provides clear explanations and offers some educated insight into what Tesla
>> may have been thinking as he conducted his famous experiments. Rich also
>> negates some myths that were spun in the book, Prodigal Genius, especially
>> the 135 ft. long sparks off a 3 ft. dia copper sphere.
>>
>> Glad to see it for sale again.
>>
>> D.C. Cox
>>
>>
>>
>>
>> On Tue, Sep 29, 2009 at 12:44 PM, Richard Hull <hullr@xxxxxxxxxxxx> wrote:
>>
>>
>>> It has been a long while, but I am signing back on to alert anyone
>>> interested in my expanded book, "The Tesla Coil Builders Guide to the
>>> Colorado Springs Note of Nikola Tesla", is back in print and is being sold
>>> by Electric Spacecraft Inc. ,by agreement with me.
>>>
>>> I am told by them that the book is to be priced at $35.00 plus $5.00
>>> shipping.
>>>
>>> I constantly get requests for this book which has been out of print and
>>> have had to turn folks away. It is now back in print.
>>>
>>> You may contact them directly at www.electricspacecraft.com<
>>> http://www.electricspacecraft.com>
>>>
>>> Richard Hull
>>> _______________________________________________
>>> Tesla mailing list
>>> Tesla@xxxxxxxxxx
>>> http://www.pupman.com/mailman/listinfo/tesla
>>>
>>>
>> _______________________________________________
>> Tesla mailing list
>> Tesla@xxxxxxxxxx
>> http://www.pupman.com/mailman/listinfo/tesla
>>
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>>
>>
>>
>>
>
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