optimal aspect ratio

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

Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <herwig.roscher-at-gmx.de>


Fellow coilers,

The latest edition of a German radio amateur magazine is dealing with 
the optimal aspect ratio of cylindrical single layer air core coils 
(like the solenoid type primaries in our TC systems).

The author proofs, that coils with an aspect ratio length/diameter of 
0.45 provide maximal inductance and minimal resistance.

The number of turns is calculated from
						7.43 x 3rd root(L in µH/dia in mm) 

Unfortunately there is no URL available (the publisher wants to sell 
the copies of course).

Cheers,

Herwig
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Greed is the root of all evil!
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