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[TCML] Re: Trumpet coil experiment comparing electrostatic and magnetic modes
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[TCML] Re: Trumpet coil experiment comparing electrostatic and magnetic modes
To : tcml@xxxxxxxxxxxxxxx Subject : [TCML] Re: Trumpet coil experiment comparing electrostatic and magnetic modesFrom : Mark Rzeszotarski via Tesla <tcml@xxxxxxxxxxxxxxx >Date : Sat, 7 Mar 2026 18:31:51 -0500Arc-authentication-results : i=1; mta-outp-ksl-1; spf=pass (mta-outp-ksl-1.case.edu: domain of case.edu designates 209.85.222.197 as permitted sender) smtp.mailfrom=case.edu; dkim=pass (Good 2048 bit rsa-sha256 signature) header.d=case.edu header.i=None header.s=g-case; dmarc=pass (p=REJECT sp=Undefined pct=100 dis=NONE) header.from=case.eduArc-filter : OpenARC Filter v1.0.0 mta-outp-ksl-1.case.edu E1FB11375Arc-message-signature : i=1; a=rsa-sha256; d=case.edu; s=cwru-mta; t=1772926314; c=relaxed/simple; bh=LzBGlMgX1T3RHlqeVzXzPycUbAujSV/uPfzjBEHxoMg=; h=DKIM-Signature:Message-ID:Date:MIME-Version:Subject:To:From:to: subject:message-id:date:from:mime-version:dkim-signature; b=2Y24w5VYB1mrtS2wk2YLO0LmzS/x7jcGb5j4udnE1/MH1z5yIER3BE8sZ+ATCWeZv9Me3enS/+56pzR0hGTHJEg85OY0UEoE7G7+1U85AUO339BKOv5HWPdEt8ortQj3XMEBYIqEA6xIK0G9ghPumsitp+JpSPfEM1/seUc12MfjuSEklsWA6F6u6QJnEAX4sq9cd2H9NNaynCPPKinCkkcb7AOzt3ZQOKPaZhtIHLMU0nglenb/+Z26653GpwJklee7xTHdgOG0UF+jWWxEPlOWxCkKZ6QkYfdbTzMO9g8gyyo1+UpW7F61FFQNl6aGhzsUZQb7Q03wIRCT8m2ajA==Arc-seal : i=1; a=rsa-sha256; d=case.edu; s=cwru-mta; t=1772926314; cv=none; b=28XoxRpUqZHhyuQCKT31EpZcVv6e2d/wSpytWlzo5624KrkyXKxiYs2tucyR4Iv62oesxaoECwkO4v0SKRmFNH2p641pzYFCe1B6cAwodMs5UdK2TBzcdgBgIIR1V3vpqqp4y9cTGJHv9RtrdVTISdEKSZ41i5M43zJanFvaRj02ajkGOMLFEzLXEphoN5jt2OZXj866LMfud1RjnLK7SmodyveNgWpfM8JyB2yg7N//p/4DBID9bCbVbCbJvmpDtWVTIl8c0UaZI7GKTTJOHHdC0hAJy+aLOUccooZU70Fed6k3rMfbszcA1W1MB1vpVyuKm2urzJErTrrDmeNghQ==Archived-at : <https://tcml.pupman.com/archives/list/tcml@xxxxxxxxxxxxxxx /message/RB2BOPHJGTM5ZK7ZFIELK5YRPGBX4F75/>Authentication-results : piggy.pupman.com; dkim=pass (2048-bit key, unprotected) header.d=emwd.com header.i=@emwd.com header.a=rsa-sha256 header.s=harmony header.b=xhoN699J; dkim=fail reason="signature verification failed" (2048-bit key, unprotected) header.d=case.edu header.i=@case.edu header.a=rsa-sha256 header.s=g-case header.b=QJBqkY/mAuthentication-results : host.harmonylists.io; dkim=pass (2048-bit key; unprotected) header.d=case.edu header.i=@case.edu header.b="QJBqkY/m"; dkim-atps=neutralAuthentication-results : mta-outp-ksl-1; spf=pass (mta-outp-ksl-1.case.edu: domain of case.edu designates 209.85.222.197 as permitted sender) smtp.mailfrom=case.edu ; dkim=pass (Good 2048 bit rsa-sha256 signature) header.d=case.edu header.i=None header.s=g-case; dmarc=pass (p=REJECT sp=Undefined pct=100 dis=NONE) header.from=case.edu;Authentication-results : mta-outp-ksl-1; arc=none smtp.remote-ip=129.22.103.228Cc : Mark Rzeszotarski <msr7@xxxxxxxx >Delivered-to : teslaarchive@xxxxxxxxxx Dkim-filter : OpenDKIM Filter v2.11.0 piggy.pupman.com 161BB430E6DDkim-signature : v=1; a=rsa-sha256; c=simple/simple; d=emwd.com; s=harmony; t=1772929433; bh=8la7/yovjs0hNq8N06mzj1ASH7juWHH86WmWg3e3ieo=; h=Date:To:References:In-Reply-To:Reply-To:Subject:List-Id: List-Archive:List-Help:List-Owner:List-Post:List-Subscribe: List-Unsubscribe:From:Cc:From; b=xhoN699JruPSzzvcNtwANJkI21JTgzyxg926dhhw3HHJh3qK2znuI4gOkpzw9CrkW mpoW7J6ee4U+gXwTWvGfdjYw5H7PwbsRQJ3sdOS/SYcTpg0WPxxutnzQqSlzFviYiW we4caZ7weLahB6NPqshbvPDItZC126pcnjIL/tVUNuchLb16QoHNzoVAKXgXi8wSaV A7+8c/13truRv7A+vUkCLWqVBxj2A3tewVcfzpEOQKmaupAX85KFV84u0Tccs0S6qQ YEZMJDjIYlKXJ0EY9kk2xqQvmblxz/ZFaZVeuUkaMvbUJy4bEW+qxcjKw59ldfBuGS cTyotk9jdHHqw==Dkim-signature : v=1; a=rsa-sha256; c=relaxed/relaxed; d=case.edu; s=g-case; t=1772926313; x=1773531113; darn=tcml.pupman.com; h=content-transfer-encoding:in-reply-to:from:content-language :references:to:subject:user-agent:mime-version:date:message-id:from :to:cc:subject:date:message-id:reply-to; bh=gjuCeo5hz3f1PYVmfaIasa4bqkbMDW1DFmNbQnasiLU=; b=QJBqkY/mSiVXgFpf7336JbBl6JOgU7jDjGP+wyUMvv267ugJAns4I49zWacE6wli8z b8QTrXS8HgXD1afSOP2Bu6TKKqFq40i2sm79GA9Nttyfq8fxXuyo0Atx4MacokEplt4m Rtp9jRzXe4u50BryPqD8zLR3fJlOXFRwzbNy5Iijou5IgXey/gZU5vw6/f7uGR+AwA0D BjRGzLJc+NDzOKbPsp3MfQdWexx5Gqe8LYwNws2QtmZqbmMEHu3IsesolZg5OmQ2zxZn jjsRGWI+9E9KsSRvW5KIo/TPZCfePDvgUHkHhy/j3JyqrfE58051xGhUVizrO4wIVVhM 1YZw==In-reply-to : <CAFX++Pb+ENRutnLxuaowc-+_7nocPBStXGrS7eb3X1GYYsuPyw@mail.gmail.com >List-archive : <https://tcml.pupman.com/archives/list/tcml@tcml.pupman.com/ >List-help : <mailto:tcml-request@tcml.pupman.com?subject=help >List-id : Tesla Coil Mailing List <tcml.tcml.pupman.com>List-owner : <mailto:tcml-owner@tcml.pupman.com >List-post : <mailto:tcml@tcml.pupman.com >List-subscribe : <mailto:tcml-join@tcml.pupman.com >List-unsubscribe : <mailto:tcml-leave@tcml.pupman.com >References : <CAD1NOyJFqouMXYGnSkFP7zN-iYELK_km6Q9_Q-CGZFaSySuc4Q@mail.gmail.com > <CAOyvoPQmyrktGkYaxYS8Sg_BFe6mYZGwzJyK6f+w-hOsN40fXQ@mail.gmail.com > <CAFX++Pb+ENRutnLxuaowc-+_7nocPBStXGrS7eb3X1GYYsuPyw@mail.gmail.com >Reply-to : Tesla Coil Mailing List <tcml@xxxxxxxxxxxxxxx >User-agent : Mozilla Thunderbird
Several decades ago while investigating mutual inductance, I built a
great many coils using various coil geometries. In your case, when
estimating the coupling between the primary and secondary, be aware that
most of the trumpet coil inductance will exist in the first several
turns of the coil, since inductance depends on the coil radius squared.
That should be kept in mind when determining the primary coil
placement. The mutual inductance between the primary and secondary will
strongly depend on the proximity of the primary with the first several
turns of the trumpet coil, where most of inductance resides.
Mark Rzeszotarski, Ph.D.
On 3/7/2026 11:27 AM, lightning fun wrote:
Looking at makeing a trumpet or tapered coil, (assumed benefit coupling)..
just got the capital funds working again, interested but tught on time and
resources.. more data and ideas welcome..
Best regards,
David Thomson
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--
Mark S. Rzeszotarski, Ph.D., FAAPM, DABR
Emeritus Professor of Radiology
Emeritus Professor of Biomedical Engineering
Case Western Reserve University
Cleveland Ohio, U.S.A. 44109
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