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Yes, it has Ian. But, I don't recall anyone pursuing it . Not certain, but no reason why Tracy wouldn't use the "lost spark" method since it simplifies things. And since he has the leading and trailing plugs firing at nearly the same instant - should work on both ignition systems.

Not certain what algorithm Tracy uses - he may also use the 15 deg spacing "tooth" marks as well.

----- Original Message -----

From: Ian Dewhirst

To: Rotary motors in aircraft

Sent: Friday, May 06, 2005 1:43 PM

Subject: [FlyRotary] Re: Emailing: Possies & CAS 007, Possies & CAS 008, Possies & CAS 009

Hi Ed, has a crank trigger been discussed in the past? If so is anyone pursuing it? Do you know what the EC-2 needs to see, I assume that the EC-2 needs to see 3 pulses spaced 120 degrees apart on the crank, I am guessing that Tracy fires both rotors at the same time for simplicity as one would be starting the power cycle while the other was ending the exhaust cycle.

I agree that the electronic components in the crank angle sensor are unlikely to fail, in my experience the problem is usually a failed connector or bad harness usually resulting from poor routing, past repairs in the vicinity, or old age causing the connectors to become brittle. -- Ian

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On Behalf Of Ed Anderson
Sent: Friday, May 06, 2005 1:09 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Emailing: Possies & CAS 007, Possies & CAS 008, Possies & CAS 009

Very Interesting approach, Georges.

Simpler than trying to adapt the twin distributor 12A front mount. However, with both on the same shaft not certain you have true redundancy - in my opinion the shaft is more likely to fail than the simply electrical circuit used to sense the rotation. For true redundancy, I would think you would want to put a flywheel/pulley angle sensor - probably flywheel end where a flopping belt wouldn't tear it out.

Ed

----- Original Message -----

From: Echo Lake Fishing Resort (Georges Boucher)

To: Rotary motors in aircraft

Sent: Friday, May 06, 2005 12:23 PM

Subject: [FlyRotary] Emailing: Possies & CAS 007, Possies & CAS 008, Possies & CAS 009

Group

I gave up on the 12a front cover to have igniter redundancy.The first photo is the semi completed unit (need to install upper shaft). Second is the adaptor & 3rd (out of focus)is the upper shaft with the center drilled out for the mounting bolt. The shaft has a ball bearing for support at the top (great support) the bearing retainer is left out as the upper shaft locates the bearing . A star washer between the two shaft will lock the two together.(note: machining accuracy is very important)

The amount of space required shouldn't be a problem on any installation

Georges B.

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