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Date: Wed, 12 Jul 2006 8:02:28 -0700
From: <cardmarc@charter.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Fw: [FlyRotary] Re: -  piezo ignition
Cc: jesse farr <jesse@jessfarr.com>
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This is the same type of system that GAMI is using to control the timing on=
 their aircraft engines and using to develop a new FADEC type aircraft cont=
oller......it senses the pressures in the cylinder thru a modified spark pl=
ug by altering the timing to prevent overpressures.
Marc Wiese-

--- jesse farr <jesse@jessfarr.com> wrote:=20
> Maybe us jokers are not too terribly far off after all. It seems like suc=
h is being worked on right now, even as we hunt and peck. Oh well. Now why =
can't that also be set up to operate fuel injectors where Ed can then just =
use his cell phone, gravity feed tanks and an inertia starter. <g>
> jofarr, soddy tn
>=20
> >>>  Mid=C3=A9 Technology Corp. in Boston is currently developing an inno=
vative Piezo-electric Ignition and Sensing Device (PISD) under a Phase II s=
ponsorship from a NASA Glenn Research Center Small Business Innovative Rese=
arch (SBIR) Program (Contract No. NAS3-98054). The patented invention (US P=
atent # 6,138,654) is a device that allows pressure increases in the cylind=
er of an internal combustion engine to strain piezo-electric elements. This=
 strain generates a voltage across the poles of the piezo, proportional to =
the change in cylinder pressure. The voltage increases until it is sufficie=
nt to create an ignition spark between the two electrodes of the spark plug=
. A separate electronic controller, that monitors the voltage output from t=
he piezo, controls the spark timing. After ignition, the piezo continues to=
 strain due to the rapid increase in pressure during the combustion process=
. Sensing the piezo voltage output after combustion provides valuable infor=
mation on the combustion cycle and may identify anomalies such as pre-ignit=
ion, knock and misfires. <<<
>=20
> ----- Original Message -----=20
> From: jesse farr=20
>=20
>  I thought that was to just indicate to us that you were piezoing on our =
leg just a little. But, who knows, next week, the Dube may tell us how it c=
an be done, now that you have broached the subject.=20
> jofarr, soddy tn