-------------- Original message from Ernest Christley <echristley@nc.rr.com>: --------------


> Kelly Troyer wrote:
> > Ernest,
> > Do not know if Lynn is on here lately but he has indicated in the past that
> the 13B
> > will start just fine with a 20-25 fixed advance.........Does the Megasquirt
> have a fixed
> > or variable advance either manual or based on RPM, etc ??
> >
> The EDIS ignition controller has a set advance of 10 degrees. I can
> modify that by offsetting my VR sensor another 15 or so. It can be
> further modified by the Megasquirt with what's called the SAW input, but
> that input is now optional. I'm setting it up so that it will be a
> non-event if the Megasquirt drops out completely. I was worried that
> the optimal advance might be different for star ting, which would make a
> computerless air-restart problematic.
>
> The plan, as it is coming together, is to have two EDIS-4 modules, one
> for the leading and one for the trailing. Each has a separate VR
> sensor, with the trailing's sensor offset 5 degree at the sensor wheel.
> The distributor will be replace with a small generator, with just
> enough capacity to run one set of coils and one EDIS module. That power
> will be supplied to the ignition through a relay that will favor normal
> ships power (ie, the small generator generally won't do anything). If
> the alternator flies apart and the battery falls off the back of the
> plane, I'll retain partial ignition. (Fuel will be handled through an
> alternate gravity feed). I still need to test for interference between
> the two VR sensors, but I should be able to start generating pictures of
> completed work RSN.