X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 14 Jan 2010 08:01:03 -0500 Message-ID: X-Original-Return-Path: Received: from imr-ma05.mx.aol.com ([64.12.100.31] verified) by logan.com (CommuniGate Pro SMTP 5.3.1) with ESMTP id 4081665 for lml@lancaironline.net; Wed, 13 Jan 2010 16:30:18 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.100.31; envelope-from=REHBINC@aol.com Received: from imo-da01.mx.aol.com (imo-da01.mx.aol.com [205.188.169.199]) by imr-ma05.mx.aol.com (8.14.1/8.14.1) with ESMTP id o0DLTe98023842 for ; Wed, 13 Jan 2010 16:29:40 -0500 Received: from REHBINC@aol.com by imo-da01.mx.aol.com (mail_out_v42.5.) id q.c64.60700459 (56031) for ; Wed, 13 Jan 2010 16:29:34 -0500 (EST) Received: from user1-656b2de53 (adsl-068-157-189-102.sip.asm.bellsouth.net [68.157.189.102]) by cia-md08.mx.aol.com (v127.7) with ESMTP id MAILCIAMD085-dadf4b4e3b3d21f; Wed, 13 Jan 2010 16:29:33 -0500 X-Original-Date: Wed, 13 Jan 2010 16:29:20 -0500 From: REHBINC Subject: Re: [LML] Re: In Flight Engine Fire Extinguishers X-Original-To: "Lancair Mailing List" In-Reply-To: X-Original-Message-ID: <21fe958c.040f.49a6.8185.981ef2033969@aol.com> References: X-Mailer: Nexus Desktop Client 3.1.20.1 MIME-Version: 1.0 Content-Type: MULTIPART/alternative; BOUNDARY=8a93d450-56b9-483a-9647-6c51bec8923c Content-Transfer-Encoding: 8bit X-AOL-IP: 68.157.189.102 X-Spam-Flag:NO X-AOL-SENDER: REHBINC@aol.com --8a93d450-56b9-483a-9647-6c51bec8923c Content-Type: TEXT/plain; charset=us-ascii CO2 would be just as ineffective in the cowling as Halon. Dry Chemical will tend to stick (somewhat) to the surfaces it encounters. It will especially stick to wetted surfaces; i.e.; fuel and oil. The biggest weakness I see with dry chemical is that it will be difficult to get it distributed to all of the surfaces under cowl. This is a difficult area to adequately protect. In race cars, we used to use Halon under hood and in the cockpit. It was good to get the fire down for half a minute or so to give the driver time to get his belts released and crawl out or the track crew to get there with additional capabilities. There was never any guarantee that the Halon system would fully extinguish the fire, it might or might not, but it would buy some time. In a turbojet application, I suspect there is MUCH less airflow between the nacelle and the engine. (Not educated here, just rationalizing) In this instance, Halon would have longer residence time in the fire area and could make sense. Rob In a message dated 01/13/10 16:08:36 Eastern Standard Time, colyncase@earthlink.net writes: Rob, How does c02 or chemical stay on the affected area? Seems like airflow near the engine is going to be high enough to move just about anything off....am I wrong? Colyn --8a93d450-56b9-483a-9647-6c51bec8923c Content-Type: TEXT/html; charset=utf-8 Content-Transfer-Encoding: 8BIT
CO2 would be just as ineffective in the cowling as Halon. Dry Chemical will tend to stick (somewhat) to the surfaces it encounters. It will especially stick to wetted surfaces; i.e.; fuel and oil. The biggest weakness I see with dry chemical is that it will be difficult to get it distributed to all of the surfaces under cowl.
 
This is a difficult area to adequately protect.
 
In race cars, we used to use Halon under hood and in the cockpit. It was good to get the fire down for half a minute or so to give the driver time to get his belts released and crawl out or the track crew to get there with additional capabilities. There was never any guarantee that the Halon system would fully extinguish the fire, it might or might not, but it would buy some time.
 
In a turbojet application, I suspect there is MUCH less airflow between the nacelle and the engine. (Not educated here, just rationalizing) In this instance, Halon would have longer residence time in the fire area and could make sense.
 
Rob
 
In a message dated 01/13/10 16:08:36 Eastern Standard Time, colyncase@earthlink.net writes:
Rob,
 
How does c02 or chemical stay on the affected area? 
Seems like airflow near the engine is going to be high enough to move just about anything off....am I wrong?
 
Colyn
 
 
 
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