|
|
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 starting, 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.
|
|