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From: sboese <sboese@uwyo.edu>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: Emailing: rotor 2 leading, rotor 2 leading b
Date: Tue, 7 Jul 2009 16:05:16 -0600
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Bill,

The engine is normally aspirated.  Very little time was spent at more =
than
23 inches of manifold pressure with the majority of it at 21 inches or =
less.
My home field density altitude is almost always 7500 ft or higher.

The fuel used was about equal amounts of either 87 octane Mogas or =
100LL.

Static timing was set up as in the EC2 manual.

Operation was at either max power mixture setting (ROP EGT) for take off =
and
climb or about 60 degrees LOP EGT for cruise.

Do any of the above conditions seem unreasonable?

The appearance in the pictures is what I have normally seen at less than =
20
hours of plug operation in the 130 hours the plane has been flying.

Steve Boese

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Bill Bradburry
Sent: Tuesday, July 07, 2009 3:43 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Emailing: rotor 2 leading, rotor 2 leading b

Steve,
You did that in only 15 hours!?
Those plugs look like they were too lean.  They are pitted and the =
electrode
is pitted as well. On the NGK site

.Over-advanced ignition timing
.Fuel octane rating too low (knock is present)
.Excessively lean air-fuel mixture
How much boost are you running?

Bill B

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of sboese
Sent: Tuesday, July 07, 2009 5:05 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Emailing: rotor 2 leading, rotor 2 leading b

Ed,

Here are two pictures of a plug removed after 15 hours of use, half with
100LL.  All the plugs look very similar.  Does this plug look typical to =
you
and satisfy your definition of "no discernable wear"?  I'm just trying =
to
satisfy myself that I'm not seeing something anomolous.

Steve Boese


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