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Date: Wed, 25 May 2011 10:11:19 -0400
From: Ernest Christley <echristley@att.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: New impeller design
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Charles Davis wrote:

> If an impeller were to be cast for this air-induction/super-charging=20
> application, and was tied-in to the e-shaft (key-way or similar) would =

> it work to have a suitable magnet cast-in to the periphery of the=20
> impeller, so that two coils could be mounted, 180 degrees apart, to=20
> provide =E2=80=98magneto-type=E2=80=99 spark to one set of plugs =E2=80=
=93 one coil per rotor at=20
> 180* for a 2-rotor, and 120* for a 3-rotor =E2=80=93 this sounds, to me=
, so=20
> simple that I am surprised nobody has done it before =E2=80=93 how good=
 would it=20
> be to have a completely battery-independent ignition system for=20
> amateur-built aircraft ? =E2=80=A6 maybe I should shaddup, & return to =
lurking =E2=80=A6
>=20
>=20

The system you describe has been working perfectly a lot longer than I've=
 been alive.  All I can say is, don't let your=20
wife catch you pulling the flywheel off your lawn mower to power your air=
plane 8*)  There is a magnet cast into the=20
flywheel, and the coil is built around a C shaped stack of stamped steel.=
  That flywheel could possibly handle the RPM=20
of the eshaft (but I wouldn't dare bet anything important on it).

I think the only issue you'd have is modifying the advance.  You could ac=
cept the "good 'nuff" compromise of a static=20
20* to 25* in exchange for the bone dry simplicity.  Possibly driving jus=
t the trailing plugs as a dead generator=20
backup.  That, combined with a gravity feed system would make your engine=
 electrically independent.  Or you could try to=20
design some sort of advance control.  Maybe use a MegaSquirt and write so=
me code to control a stepper motor that moves=20
the pickup?

I'm currently trying to use the space between the engine and the gearbox =
mount plate to install a blower and a=20
generator.  I think that is enough multipurposing of a single piece of al=
uminum for now.  However, at some point in the=20
future I may need a new lawn mower.  8*)