Return-Path: Received: from [24.25.9.101] (HELO ms-smtp-02-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 3064696 for flyrotary@lancaironline.net; Fri, 05 Mar 2004 06:55:34 -0500 Received: from edward (clt78-020.carolina.rr.com [24.93.78.20]) by ms-smtp-02-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i25BtVkG023085 for ; Fri, 5 Mar 2004 06:55:33 -0500 (EST) Message-ID: <005901c402a8$c601e230$2402a8c0@edward> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Aluminum AN fittings - Safety (was Re: [FlyRotary] Re: ready to start? Date: Fri, 5 Mar 2004 06:55:36 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0056_01C4027E.DCF75CB0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1158 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0056_01C4027E.DCF75CB0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Ok, thanks, Bernie It may be similar to what Van found when he had a study done of the = effects of anodizing the wing spar web. Apparently this process = stiffens the metal to some extend thereby making it more subject to = fatigue. Well, his study assumed aerobatics time on each flight and it = showed that while the fatigue life was lessened, it still would have = taken 20,000 hours (as best I recall) of flying to approach the fatigue = life of the spar - clearly not something one has to lose sleep over at = night. No, have not flown it yet. Got it installed and finished the control = wiring yesterday, but still need to attach heat shield as well as few = other things. I estimate I should be airborne early next week. Intend = to do ground run-ups this weekend. Ed Ed Anderson RV-6A N494BW Rotary Powered Matthews, NC ----- Original Message -----=20 From: WALTER KERR=20 To: Rotary motors in aircraft=20 Sent: Thursday, March 04, 2004 10:06 PM Subject: [FlyRotary] Re: Aluminum AN fittings - Safety (was Re: = [FlyRotary] Re: ready to start? Ed, Van used to recommend only steel AN fittings on the lycomings until it = was pointed out that the brand new engines were shipped from the factory = with some flight critical aluminum at which time Van backed away from = his recommendation.=20 Did the DIE variable length fly yet? Bernie ----- Original Message -----=20 From: Ed Anderson=20 To: Rotary motors in aircraft=20 Sent: Thursday, March 04, 2004 4:00 PM Subject: [FlyRotary] Re: Aluminum AN fittings - Safety (was Re: = [FlyRotary] Re: ready to start? ----- Original Message -----=20 From: "David Carter" To: "Rotary motors in aircraft" Sent: Thursday, March 04, 2004 12:26 PM Subject: [FlyRotary] Aluminum AN fittings - Safety (was Re: = [FlyRotary] Re: ready to start? > Paul, > > You mentioned "aluminum 1/4 NPT to -6AN adapter". It is my = understanding > that there is a real risk in using aluminum fittings on engines = due to lack > of "fatigue life" robustness of aluminum, compared to steel AN = fittings. > There have been cases of these aluminum fittings eventually = breaking off > where they are threaded into the engine block. > > It is my understanding, from reading the "lists" and articles in = Kitplanes & > Sport Aviation, that steel fittings are preferred over aluminum - = that > aluminum can actually be considered a safety hazard. > > David I suspect that in case of an engine with lots of vibration such as = an Lycoming that steel AN fittings are a prudent option. Most folks I = know flying rotaries use Aluminum fittings and as yet, I have not hear of = one failing. But then that might be because only Tracy has any = considerable number of hours yet. In some cases - like fittings to radiators - = there is little choice but to use aluminum fittings. Something to keep our = ears open to anyone who has had bad experience with aluminum fittings. = Needless to say any fitting whether steel or aluminum should have minimum stress = from hose/tubing attached to the fitting. Ed Anderson >> Homepage: http://www.flyrotary.com/ >> Archive: http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_0056_01C4027E.DCF75CB0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Ok, thanks, Bernie
 
    It may be similar to what Van = found=20 when he had a study done of the effects of anodizing the wing spar = web. =20 Apparently this process stiffens the metal to some extend thereby making = it more=20 subject to fatigue.  Well, his study assumed aerobatics time on = each flight=20 and it showed that while the fatigue life was lessened, it still would = have=20 taken 20,000 hours (as best I recall) of flying to approach the fatigue = life of=20 the spar - clearly not something one has to lose sleep over at=20 night.
 
No, have not flown it yet.  Got it = installed and=20 finished the control wiring yesterday, but still need to attach heat = shield as=20 well as few other things.  I estimate I should be airborne early = next=20 week.  Intend to do ground run-ups this weekend.
 
Ed
 
 
Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From:=20 WALTER = KERR
Sent: Thursday, March 04, 2004 = 10:06=20 PM
Subject: [FlyRotary] Re: = Aluminum AN=20 fittings - Safety (was Re: [FlyRotary] Re: ready to start?

Ed,
 
Van used to recommend only steel AN fittings on the lycomings = until it=20 was pointed out that the brand new engines were shipped from the = factory with=20 some flight critical aluminum at which time Van backed away from his=20 recommendation.
 
Did the DIE variable length  fly yet?
 
Bernie
----- Original Message -----
From: Ed Anderson
To: Rotary motors in = aircraft=20
Sent: Thursday, March 04, = 2004 4:00=20 PM
Subject: [FlyRotary] Re: = Aluminum AN=20 fittings - Safety (was Re: [FlyRotary] Re: ready to start?



----- Original Message -----
From: "David = Carter"=20 <dcarter@datarecall.net>
= To:=20 "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent:=20 Thursday, March 04, 2004 12:26 PM
Subject: [FlyRotary] Aluminum = AN=20 fittings - Safety (was Re: [FlyRotary] Re:
ready to=20 start?


> Paul,
>
> You mentioned "aluminum = 1/4 NPT=20 to -6AN adapter".  It is my understanding
> that there is = a real=20 risk in using aluminum fittings on engines due to
lack
> of = "fatigue life" robustness of aluminum, compared to steel AN=20 fittings.
> There have been cases of these aluminum fittings=20 eventually breaking off
> where they are threaded into the = engine=20 block.
>
> It is my understanding, from reading the = "lists" and=20 articles in Kitplanes
&
> Sport Aviation, that steel = fittings=20 are preferred over aluminum - that
> aluminum can actually be=20 considered a safety hazard.
>
> David

I suspect = that in=20 case of an engine with lots of vibration such as an
Lycoming that = steel=20 AN fittings are a prudent option.  Most folks I know
flying = rotaries=20 use Aluminum fittings and as yet, I have not hear of = one
failing. =20 But then that might be because only Tracy has any = considerable
number of=20 hours yet. In some cases - like fittings to radiators -  there=20 is
little choice but to use aluminum fittings.  Something to = keep=20 our ears open
to anyone who has had bad experience with aluminum=20 fittings.  Needless to
say any fitting whether steel or = aluminum=20 should have minimum stress from
hose/tubing attached to the=20 fitting.


Ed Anderson



>> =20 Homepage:  http://www.flyrotary.com/
>&= gt; =20 Archive:   http://lancai= ronline.net/lists/flyrotary/List.html
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