Return-Path: Received: from [24.25.9.101] (HELO ms-smtp-02-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2b6) with ESMTP id 232067 for flyrotary@lancaironline.net; Wed, 30 Jun 2004 12:23:01 -0400 Received: from EDWARD (clt25-78-058.carolina.rr.com [24.25.78.58]) by ms-smtp-02-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id i5UGMSNs006278 for ; Wed, 30 Jun 2004 12:22:29 -0400 (EDT) Message-ID: <005a01c45ebe$6fd08430$2402a8c0@EDWARD> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Inlet ducts Date: Wed, 30 Jun 2004 12:22:28 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1409 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1409 X-Virus-Scanned: Symantec AntiVirus Scan Engine Ed, when in Memphis at the rotor motor flyin a couple of years ago, i took the attached photos. How did you seal the duct to the cowl to get a smooth transition? Bill Schertz Actually, Bill, on those older ducts, the transition was not all that smooth. As you can see from the photo there were some gaps between the duct and the cowl. I simple sealed them with some weather stripping foam by wrapping it around the duct until the thickness sealed the gap. Clearly that created some turbulence with the lip of the duct not being tight against the cowling. On my new ducts, I took some pain to more carefully match the duct entrance to the cowling and did somewhat better. Since I also reduce the duct intake size, I flared the entrance so the air would have a smoother path rather than a rather large 1/-1/2" bump. It was fairly successful except right next to the prop side of the cowl opening where there is still a small gap at the inside corners. But, it should be much better than previous. I'll take a photo of the new ducts installed on the aircraft in the next day or so, so you can better see what I am talking about. Ed