X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from wx-out-0506.google.com ([66.249.82.239] verified) by logan.com (CommuniGate Pro SMTP 5.1c.3) with ESMTP id 1336312 for flyrotary@lancaironline.net; Thu, 17 Aug 2006 21:55:50 -0400 Received-SPF: pass receiver=logan.com; client-ip=66.249.82.239; envelope-from=russell.duffy@gmail.com Received: by wx-out-0506.google.com with SMTP id s16so570412wxc for ; Thu, 17 Aug 2006 18:55:10 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:from:to:subject:date:message-id:mime-version:content-type:x-priority:x-msmail-priority:x-mailer:importance:in-reply-to:x-mimeole; b=s/eBTEpnU2pCvGKB5nVOubmUXSMCSKQcyMTk/5gCf9q2jB5ZmUQ6pdyrnBEPJkzZFUo4HtnMGp1eRG3LDf707KNgjffVkTvcbkAFxf1bLjn/vytxMIOqvjIlC8Zw7Fi8sUa4uo3kMy7R4hqlDwi65Zku9/LSuNhhj/xea0mrUm0= Received: by 10.70.89.1 with SMTP id m1mr3905224wxb; Thu, 17 Aug 2006 18:53:27 -0700 (PDT) Return-Path: Received: from rd ( [65.6.194.9]) by mx.gmail.com with ESMTP id 9sm2307013wrl.2006.08.17.18.53.26; Thu, 17 Aug 2006 18:53:27 -0700 (PDT) From: "Russell Duffy" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Alternate Air Date: Thu, 17 Aug 2006 20:53:27 -0500 Message-ID: <000001c6c269$199d9470$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C6C23F.30C78C70" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2962 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C6C23F.30C78C70 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable So the question is, do most of you have an alternate air source in your intake system? Did the FAA inspector or DAR specifically look for it? =20 Hi Bob, =20 This is a pretty timely question, since I'm working on this decision for = the RV-8. First, I've never had alt air on any of the planes I've built, = and I don't think there's any chance my DAR would give me a hard time for not installing it now. Van's didn't even make any provision for it until = just a year or so ago, when they came out with an alt air mod, then a new mod because the first one didn't work so well.=20 =20 On one hand, I am thinking that I've never had it, and don't need it = now. On the other hand, I can easily see how it could be needed. Van = finally added it after at least a couple RV's went down due to freezing rain, or snow blocking up the air filter. Even in the RV's with carb heat, there isn't enough heat generated by the crappy factory system to melt the blockage, particularly if you're late applying it.=20 =20 Bottom line is that I think it's a good idea if you have a filtered = system fed by a ram air scoop. =20 =20 Cheers, Rusty=20 ------=_NextPart_000_0001_01C6C23F.30C78C70 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

So the question is, do most of you have an alternate = air source=20 in your intake system? Did the FAA inspector or DAR specifically look = for=20 it?

 
Hi=20 Bob,
 
This is = a pretty timely=20 question, since I'm working on this decision for the RV-8.  = First,=20 I've never had alt air on any of the planes I've built, and I don't = think=20 there's any chance my DAR would give me a hard time for not installing = it=20 now.  Van's didn't even make any provision for it until just a = year or=20 so ago, when they came out with an alt air mod, then a new mod because = the first=20 one didn't work so well. 
 
On one = hand, I am=20 thinking that I've never had it, and don't need it now.  On the = other hand,=20  I = can easily see how it=20 could be needed.  Van finally added it after at least a couple RV's = went=20 down due to freezing rain, or snow blocking up the air = filter.  Even=20 in the RV's with carb heat, there isn't enough heat generated by the = crappy=20 factory system to melt the blockage, particularly if you're late = applying=20 it. 
 
Bottom = line is that I=20 think it's a good idea if you have a filtered system fed by a ram air=20 scoop.  
 
Cheers,
Rusty 
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