Trailing plugs are more susceptible to detonation. It sounds as if your
insulator problem and perhaps your power loss problem were possibly caused by
detonation -- you may want to try backing-off your trailing ignition timing a
few degrees and see if that corrects things.

Jon Lauter
Rotary Power Marine Corporation

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