X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [129.116.87.170] (HELO MAIL01.austin.utexas.edu) by logan.com (CommuniGate Pro SMTP 4.3c5) with ESMTP id 937886 for flyrotary@lancaironline.net; Mon, 09 May 2005 15:51:31 -0400 Received-SPF: none receiver=logan.com; client-ip=129.116.87.170; envelope-from=mark.steitle@austin.utexas.edu X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C554D0.638BB6CA" Subject: RE: [FlyRotary] Re: center rotor OFF Date: Mon, 9 May 2005 14:50:44 -0500 Message-ID: <87DBA06C9A5CB84B80439BA09D86E69E016C1882@MAIL01.austin.utexas.edu> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: center rotor OFF Thread-Index: AcVUzMpq6a4Qk09STWWSF2nV7D1ZsQAAs/tA From: "Mark R Steitle" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C554D0.638BB6CA Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Here is the answer to the muffler problem. Active Noise Control. No big, heavy, draggy muffler needed. =20 =20 ...Active Noise Control is unique to this vehicle. Active Noise Control (ANC) uses sound waves generated from the audio speakers to cancel out any booming noise from the powertrain. The ANC controller uses a microphone to detect any noise and then generates a signal 180 degrees out of phase to cancel out the original noise.=20 =20 Mark S. =20 ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Russell Duffy Sent: Monday, May 09, 2005 2:24 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: center rotor OFF =20 I'm thinking this would not be a good plan. For the piston engines you referred to, I bet they have a way to control the valves with solenoids so the deactivated pistons aren't producing compression.=20 Actually they do have compression. No fuel or fire.=20 Bill Jepson=20 =20 =20 OK, make me look it up :-) Apparently, they stop the valves from opening, rather than leaving them open. I couldn't find anything that gave details of exactly what point in the sequence they stop the valves, so the cylinder could either be full of air (silly and wasteful of power), empty of air (would cause vacuum that would be as bad as the compression force), or perhaps somewhere in between. =20 =20 Here's the best article I found, though with annoying ads. Don't forget about those active controlled engine mounts to smooth out the 3 cylinder operation in economy mode. Just boggles the mind what they'll do to make improvements in economy.=20 =20 http://www.canadiandriver.com/articles/jk/041014.htm =20 Cheers, Rusty (Great Plains VW 2180 running, and for sale) ------_=_NextPart_001_01C554D0.638BB6CA Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message

Here is the answer to the muffler problem.  Active Noise Control.  No big, heavy, draggy muffler needed.   

 

<snip from “Canadian = Driver” article>

…Active Noise Control is unique to this vehicle. = Active Noise Control (ANC) uses sound waves generated from the audio speakers = to cancel out any booming noise from the powertrain. The ANC controller = uses a microphone to detect any noise and then generates a signal 180 degrees = out of phase to cancel out the original noise.

<snip>

 

Mark = S.

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Russell Duffy
Sent: Monday, May 09, = 2005 2:24 PM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Re: = center rotor OFF

 

I'm thinking this would not be a = good plan.  For the piston engines you referred to, I bet they have a = way to control the valves with solenoids so the deactivated pistons aren't = producing compression. 

Actually they do have compression. No fuel or fire. =

Bill Jepson 

 

 

OK, make me look it up :-)  = Apparently, they stop the valves from opening, rather than leaving them = open.  I couldn't find anything that gave details of exactly what point in the = sequence they stop the valves, so the cylinder could either be full of air (silly = and wasteful of power), empty of air (would cause vacuum that would be as = bad as the compression force), or perhaps somewhere in = between.  

 

Here's the best article I found, though with annoying ads.  Don't forget about those active = controlled engine mounts to smooth out the 3 cylinder operation in economy mode.  Just boggles the mind what they'll do to make improvements = in economy. 

 

 

Cheers,

Rusty (Great Plains VW 2180 running, and for sale)

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