X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 19 Aug 2013 07:48:10 -0400 Message-ID: X-Original-Return-Path: Received: from plus24.host4u.net ([66.70.195.24] verified) by logan.com (CommuniGate Pro SMTP 6.0.6) with ESMTP id 6431941 for lml@lancaironline.net; Sun, 18 Aug 2013 20:50:40 -0400 Received-SPF: none receiver=logan.com; client-ip=66.70.195.24; envelope-from=cj@AwlBiz.com Received: from www.awlbiz.com (localhost [127.0.0.1]) by plus24.host4u.net (8.11.6/8.11.6) with ESMTP id r7J0o3x24295 for ; Sun, 18 Aug 2013 19:50:04 -0500 Received: from 99-35-194-187.lightspeed.edmdok.sbcglobal.net ([99.35.194.187]) (SquirrelMail authenticated user cj); by www.awlbiz.com with HTTP; Sun, 18 Aug 2013 19:50:04 -0500 (CDT) X-Original-Message-ID: <59780.99.35.194.187.1376873404.squirrel@99.35.194.187> In-Reply-To: References: X-Original-Date: Sun, 18 Aug 2013 19:50:04 -0500 (CDT) Subject: Re: [LML] Fw: [LML] Re: FW: [LML] Flaps on take-off? From: "Craig Jimenez" X-Original-To: "Lancair Mailing List" User-Agent: SquirrelMail/1.4.3a X-Mailer: SquirrelMail/1.4.3a MIME-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit > how much drag off the propeller disk can be modulated by > using the prop rpm control ? A lot as noted by Scott. > but then again . . . if the engine is ceased . . . the spring in the > prop hub makes the blades go flat pitch . . . maximum drag ! As long as the engine is turning, the oil pump is typically making normal oil pressure, so most engine failures give you the option of pulling the prop back to course pitch (greatly reducing drag). If oil pressure is lost, you are correct, the prop will go to max rpm, but insufficient oil pressure may subsequently cause the engine to seize, which is fairly low drag:( Craig