X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 04 Mar 2011 09:14:25 -0500 Message-ID: X-Original-Return-Path: Received: from vms173019pub.verizon.net ([206.46.173.19] verified) by logan.com (CommuniGate Pro SMTP 5.4c2o) with ESMTP id 4890450 for lml@lancaironline.net; Fri, 04 Mar 2011 08:36:31 -0500 Received-SPF: pass receiver=logan.com; client-ip=206.46.173.19; envelope-from=n5zq@verizon.net Received: from p6520y ([unknown] [173.72.167.62]) by vms173019.mailsrvcs.net (Sun Java(tm) System Messaging Server 7u2-7.02 32bit (built Apr 16 2009)) with ESMTPA id <0LHJ004OACFFL792@vms173019.mailsrvcs.net> for lml@lancaironline.net; Fri, 04 Mar 2011 07:35:40 -0600 (CST) X-Original-Message-id: From: "Bill Harrelson" X-Original-To: "Lancair Mailing List" References: In-reply-to: Subject: Re: [LML] Re: Burned dust cover looking for material that wontburn. X-Original-Date: Fri, 04 Mar 2011 08:35:38 -0500 MIME-version: 1.0 Content-type: multipart/alternative; boundary="----=_NextPart_000_0067_01CBDA47.23AAA430" X-Priority: 3 X-MSMail-priority: Normal Importance: Normal X-Mailer: Microsoft Windows Live Mail 15.4.3502.922 X-MIMEOLE: Produced By Microsoft MimeOLE V15.4.3502.922 This is a multi-part message in MIME format. ------=_NextPart_000_0067_01CBDA47.23AAA430 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Bill, On the 2 place Lancairs with forward hinged canopies in the open = position there can be a =E2=80=9Cfocused mirror=E2=80=9D effect when the = sun is behind the airplane at certain angles. It gets hot enough to melt = plastic covering on the glare shield, usually in two small, specific = spots. I suppose it could cause a fire but I=E2=80=99ve never heard of = this happening. My guess (no hard scientific data here) is that the temp = required to melt a small area of plastic is a lot lower than that = required to actually start a fire in any of the materials that would = likely be present in the dust cover. While this is certainly a nuisance, = I really wouldn=E2=80=99t consider it a fire hazard. Bill Harrelson N5ZQ 320 1,850 hrs N6ZQ IV under construction From: Bill Bradburry=20 Sent: Thursday, March 03, 2011 3:37 PM To: lml@lancaironline.net=20 Subject: [LML] Re: Burned dust cover looking for material that wontburn. What is the scenario that causes the dust cover to burn? Why is it only = the dust cover? What are the sun angles, canopy angles, etc that causes = this to happen? What prevents the dust cover from catching on fire and = burning the plane to the ground? I understand that this phenomenon happens, but I don=E2=80=99t = understand anything else about it. Can someone please explain? =20 Bill B ------=_NextPart_000_0067_01CBDA47.23AAA430 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable
Bill,
 
On the 2 place Lancairs with forward hinged canopies in the open = position=20 there can be a =E2=80=9Cfocused mirror=E2=80=9D effect when the sun is = behind the airplane at=20 certain angles. It gets hot enough to melt plastic covering on the glare = shield,=20 usually in two small, specific spots. I suppose it could cause a fire = but I=E2=80=99ve=20 never heard of this happening. My guess (no hard scientific data here) = is that=20 the temp required to melt a small area of plastic is a lot lower than = that=20 required to actually start a fire in any of the materials that would = likely be=20 present in the dust cover. While this is certainly a nuisance, I really = wouldn=E2=80=99t=20 consider it a fire hazard.
 
Bill Harrelson
N5ZQ 320 1,850 hrs
N6ZQ  IV under construction
 
 
 
Sent: Thursday, March 03, 2011 3:37 PM
Subject: [LML] Re: Burned dust cover looking for material = that=20 wontburn.
 

What is the = scenario=20 that causes the dust cover to burn?  Why is it only the dust = cover? =20 What are the sun angles, canopy angles, etc that causes this to = happen? =20 What prevents the dust cover from catching on fire and burning the plane = to the=20 ground?

I understand = that this=20 phenomenon happens, but I don=E2=80=99t understand anything else about = it.  Can=20 someone please explain?

 

Bill=20 B

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