X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 80 [XXX] (33%) RECEIVED: IP not found on home country list (33%) OBFUSCATED_WORD1_BILLS (33%) BODY: contains unusually quoted characters Return-Path: Received: from mail06.syd.optusnet.com.au ([211.29.132.187] verified) by logan.com (CommuniGate Pro SMTP 5.1.7) with ESMTPS id 1875672 for flyrotary@lancaironline.net; Thu, 01 Mar 2007 02:34:15 -0500 Received-SPF: none receiver=logan.com; client-ip=211.29.132.187; envelope-from=lendich@optusnet.com.au Received: from george (d220-237-209-76.dsl.nsw.optusnet.com.au [220.237.209.76]) by mail06.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id l217XJPS002554 for ; Thu, 1 Mar 2007 18:33:21 +1100 Message-ID: <004201c75bd3$e5c5efd0$4cd1eddc@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: engine mount 4130 vs 304 SS Date: Thu, 1 Mar 2007 17:33:23 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003F_01C75C27.B65174A0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Antivirus: avast! (VPS 0657-0, 12/12/2006), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_003F_01C75C27.B65174A0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Rusty, I support Bill's comments. The only place I would use SS is in the foot controls, it has to be = bigger and thicker than 4130. I love SS but wouldn't use it on any structural component - especially = on an aircraft of any sort! George ( down under) Rusty, 4130 is simply a better material for an engine mount. Lynn's comments = were pretty much on point, 4130 is stronger, harder and much tougher. = Stainless usually only is truly rust resistant if passivated or = electropolished after welding. The welding process brings some of the = iron to the surface and the area around the weld will rust in the area = of discoloration. Stainless is VERY subject to hydrogen embrittlement = too. This can cause cracking on welded structures used in vibrating = assemblys. 4130 isn't as subject to H2 embrittlement. So there are lots = of reasons to use 4130. If the structure is suitably overbuilt this = might not be a problem, but you better be sure of that. A engine mount = failure is a VERY BAD thing on a autogyro. Bill Jepson=20 =20 -----Original Message----- From: rijakits@cwpanama.net To: flyrotary@lancaironline.net Sent: Wed, 28 Feb 2007 8:35 AM Subject: [FlyRotary] Re: engine mount 4130 vs 304 SS Ernest,=20 =20 """> Thomas, I don't see the benefit of stainless being the protection = of the=20 > inside of the tube......""""=20 =20 I don't like stainless at all , unless there is no workable = alternative...=20 =20 Rusty wants the bling on the thing!!=20 =20 Thomas =20 --=20 Homepage: http://www.flyrotary.com/=20 Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/=20 -------------------------------------------------------------------------= ----- AOL now offers free email to everyone. Find out more about what's free = from AOL at AOL.com. ------=_NextPart_000_003F_01C75C27.B65174A0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Rusty, I support Bill's comments.

The only place I would use SS is in the foot = controls, it=20 has to be bigger and thicker than 4130.

I love SS but wouldn't use it on any structural = component=20 - especially on an aircraft of any sort!

George ( down under)

Rusty,

4130 is simply a better material for an engine mount. Lynn's = comments=20 were pretty much on point, 4130 is stronger, harder and much = tougher. = Stainless usually=20 only is truly rust resistant if passivated or electropolished after = welding.=20 The welding process brings some of the iron to the surface and the = area around=20 the weld will rust in the area of discoloration. Stainless is VERY = subject to=20 hydrogen embrittlement too. This can cause cracking on welded = structures used=20 in vibrating assemblys. 4130 isn't as subject to H2 embrittlement. So = there=20 are lots of reasons to use 4130. If the structure is suitably = overbuilt this=20 might not be a problem, but you better be sure of that. A engine = mount=20 failure is a VERY BAD thing on a autogyro.

Bill Jepson

-----Original Message-----
From:=20 rijakits@cwpanama.net
To: flyrotary@lancaironline.net
Sent: Wed, = 28 Feb=20 2007 8:35 AM
Subject: [FlyRotary] Re: engine mount 4130 vs 304 = SS

Ernest,
&= nbsp;
""">=20 Thomas, I don't see the benefit of stainless being the protection of=20 the
> inside of the tube......""""

I = don't like=20 stainless at all , unless there is no workable=20 alternative...

Rusty wants the bling on the=20 thing!!

Thomas
--
Homepage: http://www.flyrotary.com/
Archive and = UnSub: http://mail.lancaironline.net/lists/flyrotary/ <= BR>

AOL now offers free email to everyone. Find out more about what's free = from=20 AOL at AOL.com.

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