Subject: Ignition trigger is nearly done.
From: rotaryeng
Date: 5/30/2014, 5:55 PM
To: AAA-rotaryeng



This is sort of like mounting a distributor on the end of the e-shaft. Rotaries are notorious for a bit of run out on the nose end of the e-shaft. Especially the 3 rotor.
This ignition trigger mechanism  does not care. It runs off a bearing on the end of the e-shaft so no matter what the e-shaft does the distance of the sensor from the magnet will always be the same.

I could easily get a patent on this but one patent per week is enough :)


Paul Lamar

Are you going to kit these out when you're finished with development?
C. Smith

Yes.

BTW I have been busting my ass making four ignition systems and the potting compound destroyed two by overheating. Exotherm.
Ruined the test this coming weekend.

Anybody have any suggesting for good potting compound?


Paul Lamar
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Have you seen this?
http://www.pottingsolutions.com/my%20site/Technology/potting_hints.htm


I worked for an infrared instrumentation company in the '80's, and we potted the thermal controllers most sensitive circuits in a green compound. I'm trying to look it up, because I can't remember it's name.
C. Smith



Paul,
one other 'trick' on beating the exotherm is to mix in an inert powder with the compound, reduces the amount of potting compound, and therefore the heat and increases the thermal conductivity. Off the top of my head I would suggest Aluminum Oxide (alumina).
Bill Schertz

Is that conductive Bill? I need high dielectric strength.

Paul Lamar


Alumina (aluminum oxide) is used as an insulator on some electrical circuits.

Bill Schertz




Also often used in high tension ceramic insulators.

H. Lunt


I got some powder coming. It was rather cheap at
$40 for a 50 pounds bag.

Paul Lamar

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