Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Fri, 06 Aug 2004 13:53:33 -0400 Message-ID: X-Original-Return-Path: Received: from fed1rmmtao07.cox.net ([68.230.241.32] verified) by logan.com (CommuniGate Pro SMTP 4.2) with ESMTP id 354971 for lml@lancaironline.net; Fri, 06 Aug 2004 13:48:25 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.32; envelope-from=radialpower@cox.net Received: from [10.0.1.2] (really [68.228.79.153]) by fed1rmmtao07.cox.net (InterMail vM.6.01.03.02.01 201-2131-111-104-103-20040709) with ESMTP id <20040806174753.MXHJ20378.fed1rmmtao07.cox.net@[10.0.1.2]> for ; Fri, 6 Aug 2004 13:47:53 -0400 Mime-Version: 1.0 (Apple Message framework v613) In-Reply-To: References: Content-Type: text/plain; charset=US-ASCII; format=flowed X-Original-Message-Id: Content-Transfer-Encoding: 7bit From: Barry Hancock Subject: Re: [LML] Re: Prop pitch with pressure loss X-Original-Date: Fri, 6 Aug 2004 10:47:51 -0700 X-Original-To: "Lancair Mailing List" X-Mailer: Apple Mail (2.613) On Aug 6, 2004, at 10:19 AM, DJ Molny wrote: > Aerobatic planes are subject to significant fluctuations in oil > pressure > during maneuvers, so their props default to coarse pitch to avoid > overspeeding the engine. This behavior is purely a function of the > prop > design, and is used on both Lycoming and Vedeneyev M-14 engines. This is correct. However, what I was getting at is why don't all engines have this failure mode as it does increase glide distance substantially in a loss of power situation. I don't know about you folks, but I'd rather have max. glide distance and partial power available (fails to high pitch), than reduced glide and full power (fails to low pitch). YMMV. B