Return-Path: <13brv3@bellsouth.net> Received: from imf21aec.mail.bellsouth.net ([205.152.59.69] verified) by logan.com (CommuniGate Pro SMTP 4.1.3) with ESMTP id 2576098 for flyrotary@lancaironline.net; Thu, 11 Sep 2003 12:27:25 -0400 Received: from rad ([68.212.14.21]) by imf21aec.mail.bellsouth.net (InterMail vM.5.01.05.27 201-253-122-126-127-20021220) with ESMTP id <20030911162724.EGWD1847.imf21aec.mail.bellsouth.net@rad> for ; Thu, 11 Sep 2003 12:27:24 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: turbo wastegate requirements Date: Thu, 11 Sep 2003 11:27:24 -0500 Message-ID: <00a701c37881$95446e30$0201a8c0@rad> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00A8_01C37857.AC6E6630" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4510 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_00A8_01C37857.AC6E6630 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable <... Since the spring rate is an absolute value that is unaffected by ambient pressure and the area of the valve face is fixed, I can see no mechanical reason why this shouldn't work ...> The pressure trying to OPEN the valve is MAP applied against the inside = face of the valve. The pressure trying to CLOSE the valve is spring tension = PLUS ambient pressure applied on the outside face of the valve. You will have to somehow compensate for the ambient pressure outside the valve ... Jim S. =20 That would have been my answer too. Thanks for saving me some typing = :-) =20 Rusty =20 ------=_NextPart_000_00A8_01C37857.AC6E6630 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable Message

<... Since the spring rate is an absolute value = that is=20 unaffected by ambient pressure and the area of the valve face is fixed, = I can=20 see no mechanical reason why this shouldn't work ...>

The = pressure=20 trying to OPEN the valve is MAP applied against the inside face of the=20 valve.  The pressure trying to CLOSE the valve is spring tension = PLUS=20 ambient pressure applied on the outside face of the valve.

You = will have=20 to somehow compensate for the ambient pressure outside the valve ... Jim = S.

 
That = would have been my=20 answer too.  Thanks for saving me some typing = :-)
 
Rusty
 





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