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
  --


  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



There are also microballoons, usually made from glass or phenolic that may work well as a filler.  Cabosil is another option for a filler.
It is made of silica.  We've used both on UAVs when a light weight filler is needed.  Just be sure not to breathe them in.  Cabosil, especially.

-Josh Jacobs