Return-Path: Received: from [24.25.9.103] (HELO ms-smtp-04-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 563833 for flyrotary@lancaironline.net; Sat, 11 Dec 2004 21:26:09 -0500 Received-SPF: none receiver=logan.com; client-ip=24.25.9.103; envelope-from=echristley@nc.rr.com Received: from ms-mss-03-ce0-1 ([10.10.5.84]) by ms-smtp-04-eri0.southeast.rr.com (8.12.10/8.12.7) with ESMTP id iBC2PcCh012624 for ; Sat, 11 Dec 2004 21:25:38 -0500 (EST) Received: from southeast.rr.com (localhost [127.0.0.1]) by ms-mss-03.southeast.rr.com (iPlanet Messaging Server 5.2 HotFix 1.21 (built Sep 8 2003)) with ESMTP id <0I8L00B2T82QWU@ms-mss-03.southeast.rr.com> for flyrotary@lancaironline.net; Sat, 11 Dec 2004 21:25:38 -0500 (EST) Received: from [10.10.1.21] (Forwarded-For: [24.211.191.66]) by ms-mss-03.southeast.rr.com (mshttpd); Sat, 11 Dec 2004 21:25:38 -0500 Date: Sat, 11 Dec 2004 21:25:38 -0500 From: echristley@nc.rr.com Subject: Re: [FlyRotary] Re: Serious single rotor questions (serious??) To: Rotary motors in aircraft Reply-to: echristley@nc.rr.com Message-id: <1b6f9e91b701d8.1b701d81b6f9e9@southeast.rr.com> MIME-version: 1.0 X-Mailer: iPlanet Messenger Express 5.2 HotFix 1.21 (built Sep 8 2003) Content-type: text/plain; charset=us-ascii Content-language: en Content-transfer-encoding: 7BIT Content-disposition: inline X-Accept-Language: en Priority: normal X-Virus-Scanned: Symantec AntiVirus Scan Engine ----- Original Message ----- From: rijakits Date: Saturday, December 11, 2004 9:07 pm Subject: [FlyRotary] Re: Serious single rotor questions (serious??) > The neat thing is you hardly hear it, in comparrison to a regular > Tailrotor it > is silent. EC does this with irregular spacing of the fanblades. > I remember reading a NACA report on silencing helicoptor rotors using this technique. It's been a while, but you might want to check the LARC server if you have any desire to pursue this.