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Scott, Changing the timing difference between
leading and trailing firing as Tracy has done with his EC2 ignition scheme is
all that is really needed to ensure no significant power loss in event of
losing one or the other ignition sources(now he tells me {:>)).
When I switch between both and leading or
trailing only during my pre-flight check (controller B) - I notice a very
slight change in engine tone - but no difference is discernable on my rpm
gauge. Same in flight, I do notice the EGT does change when using only the
Trailing plug - but rpm stays the same.
Lynn would be the one to address what - if
any - effects opening up the trailing spark plug hole would have. I
must admit I would be a bit concerned about flash over into the next rotor face
as its coming up on its compression stroke, but that is purely speculation on my
part - don't know if it even could happen..
Ed
----- Original Message -----
Sent: Wednesday, April 30, 2008 10:42
PM
Subject: [FlyRotary] Re: Dual plugs
My engine was built by Hayes Rotary in
Washington. He has retired now, but he opened up my trailing plug holes for
better spark plug effectiveness in case of a leading plug failure. He thought
it would be safe for an aircraft even tho a small bit of compression might be
lost.
I have not flown my engine yet, but in the initial ground run while
testing the B controller, I performed the coil cut out test and they
seemed about equal, that is a slight loss of RPM. Sorry, I was too excited to
have my engine running for the first time to record what the drop was. But now
reading that the drop is negligable without increasing the size of the hole
for the trailing plug, I would nopt have had it
done.
Scott
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