X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from wx-out-0506.google.com ([66.249.82.226] verified) by logan.com (CommuniGate Pro SMTP 5.1c.4) with ESMTP id 1407485 for flyrotary@lancaironline.net; Sun, 17 Sep 2006 21:13:24 -0400 Received-SPF: pass receiver=logan.com; client-ip=66.249.82.226; envelope-from=russell.duffy@gmail.com Received: by wx-out-0506.google.com with SMTP id i29so3719744wxd for ; Sun, 17 Sep 2006 18:12:45 -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=fODnpMTBeGdE3p+CNyPAUCbHlJt30awOgzB9qUKOPCJXVKS+Y+rfzkm7fAQ1UwyxW3hnnY44DZXYvvdd02WHKrnMxchoBxn6P4dRR09eBgw417YEKk0vdHiQfxEj+k/XvzNLdyWRZoTPayTpoIIdMwM4XU+rXR7D+qs/HuaHQ8g= Received: by 10.70.125.2 with SMTP id x2mr9282106wxc; Sun, 17 Sep 2006 18:12:45 -0700 (PDT) Return-Path: Received: from rd ( [65.6.194.9]) by mx.gmail.com with ESMTP id 12sm4278437wrl.2006.09.17.18.12.44; Sun, 17 Sep 2006 18:12:44 -0700 (PDT) From: "Russell Duffy" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: ducted fan questions Date: Sun, 17 Sep 2006 20:12:42 -0500 Message-ID: <000501c6dabf$8c260b30$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01C6DA95.A3500330" 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_0006_01C6DA95.A3500330 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit All the GenAv duct attempts I could dig up wound up ditching the duct and going back to a prop, some after significant time and expense. Hi Donald, Thanks for the comments. I've also noticed an huge lack of examples of GA ducted fans, and that usually tells you something important :-) I've been led to believe that ducted fans had some thrust advantages at low airspeeds, but that they generally wouldn't work well at normal GA type cruise speeds. Since a gyrocopter is a slow aircraft, that lives for thrust, it just seems like it would possible work. On the other hand, it's probably worth noting that there aren't any fan units out there for Rotax engines on gyros, or pusher ultralights for that matter. Cheers, Rusty ------=_NextPart_000_0006_01C6DA95.A3500330 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

All the GenAv duct attempts I could dig
up wound up = ditching=20 the duct and going back to a prop, some after
significant time and=20 expense.

 
Hi=20 Donald,
 
Thanks = for the=20 comments.  I've also noticed an huge lack of examples of GA ducted = fans,=20 and that usually tells you something important :-)  =
 
I've = been led to believe=20 that ducted fans had some thrust advantages at low airspeeds, = but that=20 they generally wouldn't work well at normal GA type cruise speeds.  = Since a=20 gyrocopter is a slow aircraft, that lives for thrust, it just seems like = it=20 would possible work.  On the other hand, it's probably worth noting = that=20 there aren't any fan units out there for Rotax engines on gyros, or = pusher=20 ultralights for that matter.  
 
Cheers,
Rusty
  =



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