X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-ww0-f50.google.com ([74.125.82.50] verified) by logan.com (CommuniGate Pro SMTP 5.3.9) with ESMTP id 4467912 for flyrotary@lancaironline.net; Wed, 15 Sep 2010 12:10:59 -0400 Received-SPF: pass receiver=logan.com; client-ip=74.125.82.50; envelope-from=rwstracy@gmail.com Received: by wwe15 with SMTP id 15so18022wwe.7 for ; Wed, 15 Sep 2010 09:10:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:sender:received :in-reply-to:references:date:x-google-sender-auth:message-id:subject :from:to:content-type; bh=gts02RABQg/jYS3W5d0Evgirv7nG1mGHqz0QYmk3Mu0=; b=MsfahG77o0PB9oCSjcZZ0J/IbBAQk5i4ZHppE4ct0X/vZDlwEczHlqsqldEM5/olpE N0LvnSLJcnktQvj1lPn0GN87ffr3HSADymALVPuJx0upak+d+aWJqir8kCk39VfN3tOG QeFqaKbUze0DAgR+82PrmheZjbii/qAQWMQ9k= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:content-type; b=WhlCWcv4GpzH67XEoU2Wm8x4kSYsAIlcmrQ8Rjk6aBqKzSXHHVJcqqU9OIsQaRqneq P57sjZiSUXA5yTY789o0gkMqZbSfRj+kbD8YDxdNqfiPIdzqYDmo5nX4XSTGu7FXZ+oo VGtX+i+D9M54zdp/2rITjKp6Bbx1ObUP2b1aY= MIME-Version: 1.0 Received: by 10.227.151.195 with SMTP id d3mr1480166wbw.170.1284567023287; Wed, 15 Sep 2010 09:10:23 -0700 (PDT) Sender: rwstracy@gmail.com Received: by 10.216.163.130 with HTTP; Wed, 15 Sep 2010 09:10:19 -0700 (PDT) In-Reply-To: References: Date: Wed, 15 Sep 2010 12:10:19 -0400 X-Google-Sender-Auth: AC3o-5j7Asg4T_YIUOXWl-Es1o0 Message-ID: Subject: Re: [FlyRotary] Re: 2nd flight today From: Tracy To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=00163649a39b1d160304904e9189 --00163649a39b1d160304904e9189 Content-Type: text/plain; charset=ISO-8859-1 *I'm using the stock 13BREW O2 sensor, Tracy- is that the one recommended for the EM2? It seems that the EM2 mixture graph shows about 3/4 rich, so I lean it out slooooowly, and it doesn't have a sweet spot- it just goes to about 1/3 scale. There seems to be no in-between.* Almost any O2 sensor should work fine with the EM2. Keep in mind that these narrow band O2 sensors are almost ON - OFF devices, they are not at all linear. When I'm in cruise flight, the mixture monitor is leaned off the bottom of the scale and the engine RPM has dropped from it's peak. Sounds like you are being too cautious with the mixture control. PLAY WITH IT! Run it from bottom to top, learn what it feels like and how it acts when it goes too lean and too rich. You should be able to run the mixture monitor from top to off scale on the bottom with the mixture control. You should be able to get the engine to stumble at both ends of the mixture knob settings. If you have ever adjusted the needle valve on a model airplane engine, that's how it should act. Your ear is an important tuning instrument. Tracy On 9/14/2010 10:24 PM, bktrub@aol.com wrote: > > We got the plane up in the air again, there was gobs of power, the temps > stayed low, no higher than 160 for oil and coolant, but CO in the cockpit > reached 300 PPM so it was only one circuit of the traffic pattern and a > smooth landing. That SS flex exhaust tube is getting replaced tomorrow with > the inconel. Also going to make sure the firewall is well caulked. > > > At full throttle the engine is missing a bit, I think it's too rich. The > pilot was going to play around with it a bit but due to imminent danger of > CO poisoning he decided to land it. I'll take it up on the next flight after > some Van's familiarization flights and exhaust refit. > > I'm using the stock 13BREW O2 sensor, Tracy- is that the one recommended > for the EM2? It seems that the EM2 mixture graph shows about 3/4 rich, so I > lean it out slooooowly, and it doesn't have a sweet spot- it just goes to > about 1/3 scale. There seems to be no in-between. > > But, the plane flies nicely, like an RV should. > > Next flights will be in a few days. > > Brian Trubee > > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: > http://mail.lancaironline.net:81/lists/flyrotary/List.html > > --00163649a39b1d160304904e9189 Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable I'm using the stock 13BREW O2= sensor, Tracy- is that the one recommended for the EM2? It seems that the EM2 mixture graph shows about 3/4 rich, so I lean it out slooooowly, and it doesn't have a sweet spot- it just goes to about 1/3 scale= . There seems to be no in-between.

Almost any O2 sensor = should work fine with the EM2.=A0 Keep in mind that these narrow band O2 se= nsors are almost ON - OFF devices, they are not at all linear.=A0 When I= 9;m in cruise flight, the mixture monitor is leaned off the bottom of the s= cale and the engine RPM has dropped from it's peak.

=A0 Sounds like you are being too cautious with the mixture control.=A0= =A0 PLAY WITH IT!=A0 Run it from bottom to top, learn what it feels like an= d how it acts when it goes too lean and too rich.=A0 You should be able to = run the mixture monitor from top to off scale on the bottom with the mixtur= e control.=A0 You should be able to get the engine to stumble at both ends = of the mixture knob settings.=A0=A0 If you have ever adjusted the needle va= lve on a model airplane engine, that's how it should act.=A0 Your ear i= s an important tuning instrument.

Tracy


On 9/14/2010 10:24 PM, bktrub@aol.com wrote:
We got the plane up in the air again, there was gobs of power, the temps stayed low, no higher than 160 for oil and coolant, but CO in the cockpit reached 300 PPM so it was only one circuit of the traffic pattern and a smooth landing. That SS flex exhaust tube is getting replaced tomorrow with the inconel. Also going to make sure the firewall is well caulked.
=A0
=A0
=A0At full throttle the engine is missing a bit, I think it= 9;s too rich. The pilot was going to play around with it a bit but due to=A0imminent danger of CO poisoning he decided to land it. I'll take it up on the next flight after some Van's familiarization flights and exhaust refit.
=A0
I'm using the stock 13BREW O2 sensor, Tracy- is that the one recommended for the EM2? It seems that the EM2 mixture graph shows about 3/4 rich, so I lean it out slooooowly, and it doesn't have a sweet spot- it just goes to about 1/3 scale= . There seems to be no in-between.
=A0
But, the plane flies nicely, like an RV should.
=A0
Next flights will be in a few days.
=A0
Brian Trubee

--
Homepage: =A0http:/= /www.flyrotary.com/
Archive and UnSub: =A0 http://mail.lancaironline.net:81/lists= /flyrotary/List.html


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