Return-Path: Received: from fed1mtao04.cox.net ([68.6.19.241] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2943804 for flyrotary@lancaironline.net; Thu, 22 Jan 2004 10:39:37 -0500 Received: from BigAl ([68.107.116.221]) by fed1mtao04.cox.net (InterMail vM.5.01.06.05 201-253-122-130-105-20030824) with ESMTP id <20040122153931.EVZF3905.fed1mtao04.cox.net@BigAl> for ; Thu, 22 Jan 2004 10:39:31 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Torsionals Date: Thu, 22 Jan 2004 07:39:46 -0800 Message-ID: <000701c3e0fd$f6a14e20$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0008_01C3E0BA.E87E0E20" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4024 In-Reply-To: Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_0008_01C3E0BA.E87E0E20 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable =20 Jim; =20 I realize that these are relative terms, but my opinion is that = Tracy=92s re-drive would not be called =93tight=94 tolerance. There is; what =96 = =BD back and forth play at the prop tip? As I recall, Tracy had given this some consideration, and chose to keep the relatively =93loose=94 tolerance. =20 Al =20 Subject: [FlyRotary] Re: Torsionals =20 Ed, Assuming (key word here) that Tracy's PSRU can be regarded as "tighter tolerances", mightn't rubber bushings effectively "loosen" the tolerances and get us INto more trouble than they get us OUT of? Just wonderin' .... Jim S. =20 Ed Anderson wrote: =20 > Hi Greg, > > Welcome to the list. > > Torsional vibrations and resonance are a fairly complex topic. .. In > generally tighter tolerances raises the resonant frequency of an assembly > and looser tolerances lower it. Tighter tolerances are generally more > expensive than looser. ...By the way, since the rotary does not have a > negative torque region in its > power curve this problem is minimal and can generally be handled by some > simple dampeners such as rubber disks, etc. > > Ed Anderson =20 -- Jim Sower aka Destiny's Plaything ... Crossville, TN; Chapter 5 Long-EZ N83RT, Velocity N4095T =20 =20 =20 >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_0008_01C3E0BA.E87E0E20 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

 

Jim;

 

I realize that these are relative terms, but my = opinion is that Tracy’s re-drive = would not be called “tight” tolerance. =A0There is; what – =BD back = and forth play at the prop tip?=A0 As I recall, Tracy had given this some consideration, and = chose to keep the relatively “loose” tolerance.

 

Al

 

Subject: [FlyRotary] Re: Torsionals

 

Ed,

Assuming (key word here) that Tracy's PSRU can be regarded as "tighter

tolerances", mightn't rubber bushings effectively "loosen" the tolerances = and

get us INto more trouble than they get us OUT of?

Just wonderin' .... Jim S.

 

Ed Anderson wrote:

 

> Hi Greg,

>

>=A0=A0=A0 Welcome to the list.

>

>=A0 Torsional vibrations and resonance are a fairly complex topic.=A0 ..=A0 = In

> generally tighter tolerances raises the resonant frequency of an = assembly

> and looser tolerances lower it.=A0 Tighter tolerances are generally = more

> expensive than looser.=A0 ...By the way, since the rotary does not have = a

> negative torque region in its

> power curve this problem is minimal and can generally be handled by = some

> simple dampeners such as rubber disks, etc.

>

> Ed Anderson

 

--

Jim Sower=A0 aka=A0 Destiny's Plaything ...

Crossville, TN; Chapter 5

Long-EZ N83RT, Velocity N4095T

 

 

 

>>=A0 Homepage:=A0 http://www.flyrotary.com/

>>=A0 Archive:=A0=A0 = http://lancaironline.net/lists/flyrotary/List.html

------=_NextPart_000_0008_01C3E0BA.E87E0E20--