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*To*: Tesla Coil Mailing List <tesla@xxxxxxxxxx>*Subject*: Re: [TCML] Capacitor dielectric examples and Tesla coil equations*From*: Paul Nicholson <tcml88@xxxxxxxxxxx>*Date*: Wed, 02 Dec 2009 07:35:27 +0000*Delivered-to*: teslaarchive@xxxxxxxxxx*Delivered-to*: tesla@xxxxxxxxxx*In-reply-to*: <COL105-W2305FB9B97F4C3813EB58CD1950@xxxxxxx>*List-archive*: <http://www.pupman.com/pipermail/tesla>*List-help*: <mailto:tesla-request@pupman.com?subject=help>*List-id*: Tesla Coil Mailing List <tesla.pupman.com>*List-post*: <mailto:tesla@pupman.com>*List-subscribe*: <http://www.pupman.com/mailman/listinfo/tesla>, <mailto:tesla-request@pupman.com?subject=subscribe>*List-unsubscribe*: <http://www.pupman.com/mailman/listinfo/tesla>, <mailto:tesla-request@pupman.com?subject=unsubscribe>*References*: <E874FE9E541F4EF8B9F893327559937C@powerpc> <COL105-W2305FB9B97F4C3813EB58CD1950@xxxxxxx>*Reply-to*: Tesla Coil Mailing List <tesla@xxxxxxxxxx>*Sender*: tesla-bounces@xxxxxxxxxx*User-agent*: Thunderbird 2.0.0.14 (X11/20080421)

Equations 6 and 7 are not valid. The actual Fres of the secondary may be up to twice that predicted by Eq 7. The two equations apply to a straight length of wire. When the length is wound into a solenoid, coupling between turns alters the propagation of signals along the wire and the effective signal velocity becomes dependent on the ratio height:diameter of the coil. Dependence on the h/d ratio of the coil is shown in http://abelian.org/tssp/ph1.gif which gives the effective velocity factor as a function of h/d. For example, given a h/d ratio of 5, the resonant frequency will be about 1.7 times higher than the frequency suggested by Eq 7. These comments apply to the 'bare' coil, ie before a topload is fitted. The topload throws in further complications. The program JavaTC takes these matters and others into account. -- Paul Nicholson -- _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla

**References**:**[TCML] 2 inch long insulators / spacers with screwholes***From:*Shaun Epp

**[TCML] Capacitor dielectric examples and Tesla coil equations***From:*Brian Hall

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