X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 04 Jun 2011 09:52:02 -0400 Message-ID: X-Original-Return-Path: Received: from [70.62.14.124] (HELO ustek.com) by logan.com (CommuniGate Pro SMTP 5.4c3j) with ESMTP id 5002708 for lml@lancaironline.net; Fri, 03 Jun 2011 13:36:21 -0400 Received-SPF: pass receiver=logan.com; client-ip=70.62.14.124; envelope-from=r.simon@ustek.com Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----_=_NextPart_001_01CC2213.BFF11E78" Subject: RE: [LML] Re: L-IV Choice of Engine X-MimeOLE: Produced By Microsoft Exchange V6.5 X-Original-Date: Fri, 3 Jun 2011 13:29:10 -0400 X-Original-Message-ID: X-MS-Has-Attach: yes X-MS-TNEF-Correlator: Thread-Topic: [LML] Re: L-IV Choice of Engine Thread-Index: AcwiFBAPTGwMFN5OQGWRLADTAg9h5w== From: "Lancair" X-Original-Sender: "Robert Simon" X-Original-To: "Jack Morgan" , This is a multi-part message in MIME format. ------_=_NextPart_001_01CC2213.BFF11E78 Content-Type: multipart/alternative; boundary="----_=_NextPart_002_01CC2213.BFF11E78" ------_=_NextPart_002_01CC2213.BFF11E78 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable I have read some discussion on the effects of different props, reducing harmonic vibration by changing the number of blades (4 blades on a 6-cylinder engine for example, vs. 2 or 3 blades which have lower harmonics) and this might be beneficial. That thought process might lead one to a 3 blade or 5 blade on an 8-cylinder engine. =20 Another concept which might be considered is the prop material itself, with composite props like the MT damping out the combustion shock more than an aluminium prop. =20 Guess that's what makes these planes "experimental". =20 Robert M. Simon ES-P N301ES =20 From: Jack Morgan [mailto:jmorgan1023@comcast.net]=20 Sent: Thursday, June 02, 2011 8:29 AM Subject: Re: [LML] Re: L-IV Choice of Engine The most important issue being missed is the torsional resonance the auto crankshaft receives from the propellor. The application of viscous couplings is often tried to isolate the auto crank from the propellor with some success but the weakness still remains. . . Jack Morgan ------_=_NextPart_002_01CC2213.BFF11E78 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

I have read some discussion on the effects of different props, = reducing harmonic vibration by changing the number of blades (4 blades = on a 6-cylinder engine for example, vs. 2 or 3 blades which have lower = harmonics) and this might be beneficial.  That thought process = might lead one to a 3 blade or 5 blade on an 8-cylinder = engine.

 

Another  concept which might be considered is the prop material = itself, with composite props like the MT damping out the combustion = shock more than an aluminium prop.

 

Guess that’s what makes these planes = “experimental”.

 

Robert M. Simon

ES-P N301ES

 

From:= = Jack Morgan [mailto:jmorgan1023@comcast.net]
Sent: Thursday, = June 02, 2011 8:29 AM
Subject: Re: [LML] Re: L-IV Choice of = Engine

The = most important issue being missed is the torsional resonance the auto = crankshaft receives from the propellor. The application of viscous = couplings is often tried to isolate the auto crank from the propellor = with some success but the weakness still remains. . . Jack = Morgan

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