Return-Path: <13brv3@bellsouth.net> Received: from imf16aec.mail.bellsouth.net ([205.152.59.64] verified) by logan.com (CommuniGate Pro SMTP 4.3c2) with ESMTP id 769448 for flyrotary@lancaironline.net; Thu, 03 Mar 2005 21:53:17 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.64; envelope-from=13brv3@bellsouth.net Received: from rd ([65.6.194.9]) by imf16aec.mail.bellsouth.net (InterMail vM.5.01.06.11 201-253-122-130-111-20040605) with ESMTP id <20050304025232.VWAM1997.imf16aec.mail.bellsouth.net@rd> for ; Thu, 3 Mar 2005 21:52:32 -0500 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: fuel cutoff valve necessary? Date: Thu, 3 Mar 2005 20:53:27 -0600 Message-ID: <00d801c52065$5774df30$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00D9_01C52033.0CDA6F30" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 In-Reply-To: Importance: Normal This is a multi-part message in MIME format. ------=_NextPart_000_00D9_01C52033.0CDA6F30 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable When your electric system starts to act up, you might not be able to = shut down your pumps! You still can stop your engine by cutting the fuel!=20 =20 You're reaching a bit here. A fuel pump is an on/off device. It's not = like we have a bank of CPU's running the pumps :-) =20 =20 But keeping it to a part that is not really a shut off valve, like the = fuel pump, no way! What if the pump shortens out/gets hot/leaks/etc. I want = to be able to cut the fuel at the source!=20 =20 What if your fuel valve connections leak, or the shaft of the valve? = Then you're sucking air, which is a much more ominous problem. =20 =20 Everyone has their comfort level, so feel free to install a cutoff = valve. There are certainly situations where it could be needed, but for every = one of those, I can come up with one where it's an extra danger :-) =20 =20 As a point of trivia, Van's specifically recommends against using = braided hose in place of the normal aluminum tubing from the wing tanks. The = theory is that in an accident, the wings will be pulled back, and the fuel line will be torn loose. The aluminum line will tend to pinch itself closed = when it bends and breaks, but the braided hose will stay open when it breaks. The difference is a big leak vs a small leak. Van's not so dumb :-) =20 Cheers, Rusty (my beer's empty) =20 ------=_NextPart_000_00D9_01C52033.0CDA6F30 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message
When your=20 electric system starts to act up, you might not be able to shut down = your pumps!=20 You still can stop your engine by cutting the fuel! 
 
You're reaching a bit here.  A fuel pump = is an=20 on/off device.  It's not like we have a bank of CPU's running the = pumps=20 :-) 
 
But keeping it to a = part that is=20 not really a shut off valve, like the fuel pump, no way! What if the = pump=20 shortens out/gets hot/leaks/etc. I want to be able to cut the fuel at = the=20 source! 
 
What = if your fuel=20 valve connections leak, or the shaft of the valve?  Then you're = sucking=20 air, which is a much more ominous problem. =20
 
Everyone has their comfort level, so feel = free to=20 install a cutoff valve.  There are certainly situations where it = could be=20 needed, but for every one of those, I can come up with one where it's an = extra=20 danger :-) 
 
As a point of trivia, Van's specifically = recommends against using braided hose in place of the normal aluminum = tubing=20 from the wing tanks.  The theory is that in an accident, the = wings=20 will be pulled back, and the fuel line will be torn loose.  = The=20 aluminum line will tend to pinch itself closed when it bends and breaks, = but the=20 braided hose will stay open when it breaks.  The difference is a = big leak=20 vs a small leak.  Van's not so dumb = :-)
 
Cheers,
Rusty (my beer's=20 empty)
 
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