----- Original Message -----
Sent: Thursday, August
21, 2003 3:03 AM
Subject: [FlyRotary]
Safety: LED on EC2 and Power from injectors
Thanks, Tracy, that’s a big
relief. However, today I was thinking about that. It means that if
you have your injectors and coils on the main bus like I do, then the
“magnetos” are hot whenever the main bus is turned on. This
could in theory lead to the engine firing if the prop is turned a little with
the main buss on – like pushing the plane around at night with the lights
on etccc… Something to be careful of – although I really like
the additional source of potential power.
David Leonard
The Rotary Roster:
http://members.aol.com/_ht_a/rotaryroster/index.html
David, If I recall my conversation with Tracy correctly
about the topic of inadvertent starting of the engine, I don't think you need
to worry. Tracy has designed a minimum
rpm value in the code necessary before the EC2 will produce the
signal to trigger the ignition modules. If I recall correctly this is
around 150 rpm and I believe that speed has to be maintained for at least two
revolutions of the eccentric shaft. I may be incorrect on the details,
but essential there is a safety feature. So, it would seem unlikely that pushing
the plane around by the prop would trigger a firing. Tracy does a
pretty thorough job of thinking out a design.
Ed Anderson