Pat,
If you are firing sequenced, IE leading trailing you loose more on the loss of the leading plugs.
About 60% 40% has always been the Mazda figure. If you fire both at the same time, as do most
of us airheads, you still lose more on the loss of the leading plug but not as much. The trailing hole
is so small that it mostly effects efficiency at lower speeds if you lose the trailing plug. My guess is
that if the hole was opened up it wouldn't be as big a change. The loss of compression is your biggest
reason for not doing it. A rotary needs dual ignition more than a piston engine does.
Bill Jepson


-----Original Message-----
From: Patrick Panzera <panzera@experimental-aviation.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Wed, 30 Apr 2008 2:13 pm
Subject: [FlyRotary] Dual plugs