X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from db8outboundpool.messaging.microsoft.com ([213.199.154.184] verified) by logan.com (CommuniGate Pro SMTP 6.0.6) with ESMTPS id 6432350 for lml@lancaironline.net; Mon, 19 Aug 2013 07:54:56 -0400 Received-SPF: pass receiver=logan.com; client-ip=213.199.154.184; envelope-from=rpastusek@htii.com Received: from mail105-db8-R.bigfish.com (10.174.8.253) by DB8EHSOBE032.bigfish.com (10.174.4.95) with Microsoft SMTP Server id 14.1.225.22; Mon, 19 Aug 2013 11:54:09 +0000 Received: from mail105-db8 (localhost [127.0.0.1]) by mail105-db8-R.bigfish.com (Postfix) with ESMTP id 632FE7E0145 for ; Mon, 19 Aug 2013 11:54:09 +0000 (UTC) X-Forefront-Antispam-Report: CIP:157.56.245.5;KIP:(null);UIP:(null);IPV:NLI;H:CH1PRD0710HT003.namprd07.prod.outlook.com;RD:none;EFVD:NLI X-SpamScore: 0 X-BigFish: PS0(zzzz1f42h208ch1ee6h1de0h1fdah2073h1202h1e76h1d1ah1d2ah1fc6hzz17326ah1de096h1de097hz2fh2a8h839h944hd25hf0ah1220h1288h12a5h12a9h12bdh137ah13b6h1441h1504h1537h153bh15d0h162dh1631h1758h18e1h1946h19b5h19ceh1ad9h1b0ah1d07h1d0ch1d2eh1d3fh1de9h1dfeh1dffh1e1dh1fe8h1ff5h1155h) Received-SPF: pass (mail105-db8: domain of htii.com designates 157.56.245.5 as permitted sender) client-ip=157.56.245.5; envelope-from=rpastusek@htii.com; helo=CH1PRD0710HT003.namprd07.prod.outlook.com ;.outlook.com ; Received: from mail105-db8 (localhost.localdomain [127.0.0.1]) by mail105-db8 (MessageSwitch) id 1376913247863828_7187; Mon, 19 Aug 2013 11:54:07 +0000 (UTC) Received: from DB8EHSMHS025.bigfish.com (unknown [10.174.8.250]) by mail105-db8.bigfish.com (Postfix) with ESMTP id CFD5CC80047 for ; Mon, 19 Aug 2013 11:54:07 +0000 (UTC) Received: from CH1PRD0710HT003.namprd07.prod.outlook.com (157.56.245.5) by DB8EHSMHS025.bigfish.com (10.174.4.35) with Microsoft SMTP Server (TLS) id 14.16.227.3; Mon, 19 Aug 2013 11:54:07 +0000 Received: from CH1PRD0710MB367.namprd07.prod.outlook.com ([169.254.11.120]) by CH1PRD0710HT003.namprd07.prod.outlook.com ([10.255.152.38]) with mapi id 14.16.0347.000; Mon, 19 Aug 2013 11:54:05 +0000 From: Robert R Pastusek To: Lancair Mailing List Subject: RE: [LML] Re: Fw: [LML] Re: FW: [LML] Flaps on take-off? Thread-Topic: [LML] Re: Fw: [LML] Re: FW: [LML] Flaps on take-off? Thread-Index: AQHOnNH+wDkq1yWsZ0GpovV+Yu4DKJmcazDw Date: Mon, 19 Aug 2013 11:54:05 +0000 Message-ID: <41361035E6613244A377D5AC3BF5EFDD6689D76F@CH1PRD0710MB367.namprd07.prod.outlook.com> References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [96.241.131.4] Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Return-Path: rpastusek@htii.com X-OriginatorOrg: htii.com X-FOPE-CONNECTOR: Id%0$Dn%*$RO%0$TLS%0$FQDN%$TlsDn% Craig, Short answer: The prop is probably the highest-drag item on your airplane i= f it's turning and in flat pitch (max RPM). You should test the descent rat= e/glide range for yourself... Pull the engine to idle, stabilize at best gl= ide speed and look at your descent rate. Then pull the prop control all the= way out. You'll be surprised if you've not done this before. It's an inval= uable lesson. Bob > how much drag off the propeller disk can be modulated by using the=20 > prop rpm control ? A lot as noted by Scott. > but then again . . . if the engine is ceased . . . the spring in the=20 > prop hub makes the blades go flat pitch . . . maximum drag ! As long as the engine is turning, the oil pump is typically making normal o= il pressure, so most engine failures give you the option of pulling the pro= p 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 -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html