X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmfepo103.cox.net ([68.230.241.145] verified) by logan.com (CommuniGate Pro SMTP 5.4c3j) with ESMTP id 4952174 for flyrotary@lancaironline.net; Wed, 20 Apr 2011 12:25:57 -0400 Received-SPF: softfail receiver=logan.com; client-ip=68.230.241.145; envelope-from=glasair2@me.com Received: from fed1rmimpo01.cox.net ([70.169.32.71]) by fed1rmfepo103.cox.net (InterMail vM.8.01.04.00 201-2260-137-20101110) with ESMTP id <20110420162519.PRNS20516.fed1rmfepo103.cox.net@fed1rmimpo01.cox.net> for ; Wed, 20 Apr 2011 12:25:19 -0400 Received: from [192.168.2.201] ([70.177.24.126]) by fed1rmimpo01.cox.net with bizsmtp id ZsRJ1g0092jEC4N03sRJvl; Wed, 20 Apr 2011 12:25:18 -0400 X-CT-Score: NA X-Authority-Analysis: v=1.1 cv=qIIqMNu0S/sqyG+h89WN7GOWbLwvmXps6ljS8trnEMw= c=1 sm=1 a=J_oHuY-yf3cA:10 a=f32ykCDtWUuHg+z19x9HKQ==:17 a=EXTWd63DiWttEYVB_qoA:9 a=pILNOxqGKmIA:10 a=y3paMVHGxIeLZiQSekgA:9 a=SoYs38L9tOj2yIJkG-AA:7 a=f32ykCDtWUuHg+z19x9HKQ==:117 X-CM-Score: 0.00 Authentication-Results: cox.net; none From: Steve Thomas Mime-Version: 1.0 (Apple Message framework v1084) Content-Type: multipart/alternative; boundary=Apple-Mail-65-739487498 Subject: Re: Tangential Muffler Date: Wed, 20 Apr 2011 09:25:18 -0700 In-Reply-To: To: Rotary motors in aircraft References: Message-Id: X-Mailer: Apple Mail (2.1084) --Apple-Mail-65-739487498 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 Al,=20 I'd love to have a good tangential solution. Mistral had developed one = before they declared bankruptcy. But, their engineer told me that they = were loosing at least 5 HP with it. So, if I am ignorant, I am happy to = be corrected. =20 I presume that you have shared your design before? Can I find in in the = archives? I am not a welder, so I have to hire any welding that needs = to be done, so the cost of an Inconel device will be quite pricy, I = presume. =20 Burns Stainless wrote back to me and wants me to send the failed muffler = to them for analyses. Should be interesting. =20 Best Regards, Steve Thomas _______________________________________________________ On Apr 20, 2011, at 9:51 AM, Al Gietzen wrote: > Steve wrote: > =20 > 3. At 50% power, my fuel flow is 11 GPH rich and 9GPH lean. > This doesn=92t seem right =96 at 50% power my 20B will run 9-10 gph = leaned. > =20 > The tangential style mufflers are too power-robbing > My 20B got 265 hp at 6300 rpm on the dyno with the tangential muffler = and secondary resonator. With 9.0 : 1 rotors and normally aspirated = that=92s not all bad. > But perhaps more importantly I now have 213 hour on the inconel = tangential and 321 SS secondary; and they are still in good condition. = And it is reasonably quiet. > Al G > =20 --Apple-Mail-65-739487498 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252 Al,

I'd love to have a = good tangential solution. Mistral had developed one before they = declared bankruptcy. But, their engineer told me that they were = loosing at least 5 HP with it. So, if I am ignorant, I am happy to = be corrected.

I presume that you have = shared your design before? Can I find in in the archives? I = am not a welder, so I have to hire any welding that needs to be done, so = the cost of an Inconel device will be quite pricy, I presume. =

Burns Stainless wrote back to me and = wants me to send the failed muffler to them for analyses. Should = be interesting.

Best Regards,

Steve = Thomas

______________________________________________________= _

On Apr 20, 2011, at 9:51 AM, Al Gietzen wrote:

Steve = wrote:

3. At 50% power, my fuel flow is 11 = GPH rich and 9GPH lean.
This doesn=92t seem right =96 at = 50% power my 20B will run 9-10 gph leaned.
The tangential style mufflers are too = power-robbing
My 20B got 265 hp at 6300 rpm on the dyno with the = tangential muffler and secondary resonator. With 9.0 : 1 rotors and = normally aspirated that=92s not all bad.
But = perhaps more importantly I now have 213 hour on the inconel tangential = and 321 SS secondary; and they are still in good condition. And it is = reasonably quiet.
Al G