Message

Return-Path: Received: from imf20aec.mail.bellsouth.net ([205.152.59.68] verified) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP id 377838 for flyrotary@lancaironline.net; Wed, 25 Aug 2004 12:27:22 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.68; envelope-from=sqpilot@bellsouth.net Received: from Carol ([209.214.44.143]) by imf20aec.mail.bellsouth.net (InterMail vM.5.01.06.08 201-253-122-130-108-20031117) with SMTP id <20040825162650.DBZJ1723.imf20aec.mail.bellsouth.net@Carol> for ; Wed, 25 Aug 2004 12:26:50 -0400 Message-ID: <001c01c48ac0$3acd3f20$8f2cd6d1@Carol> From: "paul" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Sorry Rusty - no bind Date: Wed, 25 Aug 2004 11:26:01 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0018_01C48A96.4CC01240" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1437 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 This is a multi-part message in MIME format. ------=_NextPart_000_0018_01C48A96.4CC01240 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message ----- Original Message -----=20 From: Russell Duffy=20 To: Rotary motors in aircraft=20 Sent: Monday, August 23, 2004 9:31 PM Subject: [FlyRotary] Re: Sorry Rusty - no bind please don't take this as being critical, I'm just asking - is it true = or not that engine fittings should be steel, not aluminum? or is that = just a myth? does aluminum fatigue faster than steel? what do certified = piston planes use? Kevin Lane Portland, OR =20 This is sort of a controversial subject. There is probably an = official FAA rule, or at least rule of thumb about only using steel = fittings when there's relative motion on the two ends of a hose. Of = course screwing steel fittings, into an aluminum gear drive would also = violate some dissimilar metal rules, so damned if you do, damned if you = don't. =20 Since I was schooled at the Van's Aircraft institute, I follow the = more common sense rules. If it's a small fitting, that isn't very = strong, it's best to use steel. If it's a fairly large fitting, then = aluminum is plenty strong. AN-6 is about the dividing line, and it = comes down to whether there's much motion. In the case of the drain = fitting you see in the pic, there's no relative motion, so I feel = aluminum is fine. =20 Cheers, Rusty (not an A&P, and don't even play one on TV) =20 This topic was recently discussed on the canard aviator's = website....seems that Lycoming is sending their brand new engines with = aluminum fittings. I agree, however that there is comfort in using = steel for the smaller (-4) sizes. I have -16 aluminum AN fittings for = my radiator hoses, and it would take a sledgehammer to damage one of = those aluminum fittings. The general consensus on the canard site was = similar....steel for the smaller fittings, but aluminum was fine for -6 = sizes and larger. I guess they figure that if Lycoming can supply a = certified engine with aluminum fittings, it's OK on our experimentals. = FWIW. Paul Conner ------=_NextPart_000_0018_01C48A96.4CC01240 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message

----- Original Message -----
From:=20 Russell=20 Duffy
To: Rotary motors in = aircraft

Sent: Monday, August 23, 2004 = 9:31=20 PM

Subject: [FlyRotary] Re: Sorry = Rusty - no=20 bind

please don't=20 take this as being critical, I'm just asking - is it true or not that = engine=20 fittings should be steel, not aluminum? or is that just a myth? = does=20 aluminum fatigue faster than steel? what do certified piston = planes=20 use?

Kevin Lane Portland, OR

This=20 is sort of a controversial subject. There is probably an = official=20 FAA rule, or at least rule of thumb about only using steel = fittings when=20 there's relative motion on the two ends of a = hose.  Of course=20 screwing steel fittings, into an aluminum gear drive would also = violate=20 some dissimilar metal rules, so damned if you do, damned if you = don't. =20

Since=20 I was schooled at the Van's Aircraft institute, I follow the = more=20 common sense rules. If it's a small fitting, that isn't very = strong,=20 it's best to use steel. If it's a fairly large fitting, = then=20 aluminum is plenty strong. AN-6 is about the dividing line, and = it comes=20 down to whether there's much motion. In the case of the drain = fitting=20 you see in the pic, there's no relative motion, so I feel aluminum is=20 fine.

Cheers,

Rusty (not=20 an A&P, and don't even play one on = TV)

This = topic was=20 recently discussed on the canard aviator's website....seems that = Lycoming is=20 sending their brand new engines with aluminum fittings. I agree, = however=20 that there is comfort in using steel for the smaller (-4) sizes. = I have=20 -16 aluminum AN fittings for my radiator hoses, and it would take a=20 sledgehammer to damage one of those aluminum fittings. The general = consensus=20 on the canard site was similar....steel for the smaller fittings, but = aluminum=20 was fine for -6 sizes and larger. I guess they figure that if = Lycoming=20 can supply a certified engine with aluminum fittings, it's OK on our=20 experimentals. FWIW. Paul=20 Conner

------=_NextPart_000_0018_01C48A96.4CC01240--