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 937301 for flyrotary@lancaironline.net; Mon, 09 May 2005 11:41:03 -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_01C554AD.67750872" Subject: RE: [FlyRotary] Re: center rotor OFF Date: Mon, 9 May 2005 10:40:19 -0500 Message-ID: <87DBA06C9A5CB84B80439BA09D86E69E016C187B@MAIL01.austin.utexas.edu> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [FlyRotary] Re: center rotor OFF Thread-Index: AcVUq4YElZr/fQHXSxy2l7tWvfM+/gAAYlQA From: "Mark R Steitle" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C554AD.67750872 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable If I can add that it might be a better plan to use a CS prop, go to coarse pitch and throttle back some for economy cruise. Sort of like an overdrive gear. I guess that's the idea behind adjustable props. =20 =20 Mark S. =20 =20 =20 ________________________________ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen Sent: Monday, May 09, 2005 10:26 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: center rotor OFF =20 =20 On a 3 rotor in economy cruise, would it be possible to completely shut off the center rotor fuel injectors and just pump air? I am sure friction losses would not be much, and fuel savings could be high. Many cars do this now by shutting off the valves or some other method. Would the lack of a power pulse unbalance the engine?=20 =20 Definitely. Don't go there. The three rotors fire at equal intervals so I expect it may not make any difference which of the three you shut down. Having run briefly with one rotor not firing (don't recall which one); it's pretty rough. =20 Al =20 ------_=_NextPart_001_01C554AD.67750872 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

If I can add that it might be a = better plan to use a CS prop, go to coarse pitch and throttle back some for = economy cruise.  Sort of like an overdrive gear.  I guess that’s = the idea behind adjustable props. 

 

Mark S.  =

 

 

From: = Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al Gietzen
Sent: Monday, May 09, = 2005 10:26 AM
To: Rotary motors in = aircraft
Subject: [FlyRotary] Re: = center rotor OFF

 

 

On a 3 rotor in economy cruise, would it be possible to completely shut off = the center rotor fuel injectors and just pump air? I am sure friction losses = would not be much, and fuel savings could be high. Many cars do this now by = shutting off the valves or some other method. Would the lack of a power pulse = unbalance the engine?

 <= /font>

Definitely.&nb= sp; Don’t go there.  The three rotors fire at equal intervals so = I expect it may not make any difference which of the three you shut down. =  Having run briefly with one rotor not firing (don’t recall which one); it’s pretty rough.

 <= /font>

Al

 

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