The AC Delco coils  are magnetically biased inductive ignition

coils with

their own igniters and current limiting circuitry.  Magnetically

biased

means they have a very high energy spark in spite of their small

size.

Others may disagree (and I'm sure they will :)  but I think  CDI

does not

have any advantages in our (aircraft) application when the engine

is run at

7000 rpm or less.

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

By their own igniters, do you mean that they have the drive transistors
built into them?  Along with current limiting once the core is
saturated?

Yep, I agree with you and see no reason to make things complicated with
CDI unless it's for a reason :)  I'm currently trying to do some
ion-current measurments, so I'm going to build a CDI system so I can
burn my fingers a litttle while prototyping :0

-Eric Holmberg
Express FT

Yes, drive transistor is built in.  There is an on-time limiting function in
the igniter but it is only to prevent burning itself up if left on
continuously by a computer malfunction.  In normal operation the dwell time
must be controlled by the computer.

Let us know how the ion current experiment turns out!

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

 
The AirCraft Rotary Engine NewsLetter.              Powered by Linux.
ACRE NL web site.
http://home.earthlink.net/~rotaryeng/            http://www.linux.org