X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sat, 03 Nov 2007 22:05:00 -0400 Message-ID: X-Original-Return-Path: Received: from elasmtp-junco.atl.sa.earthlink.net ([209.86.89.63] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2454316 for lml@lancaironline.net; Sat, 03 Nov 2007 19:22:51 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.63; envelope-from=colyncase@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=kD5st+X4BJqc/a8GiQT/vfGaRO5IfSLYTlUrxa85vYyYASm3viz8UBrPYdFJ590l; h=Received:Message-ID:From:To:References:Subject:Date:MIME-Version:Content-Type:X-Priority:X-MSMail-Priority:X-Mailer:X-MimeOLE:X-ELNK-Trace:X-Originating-IP; Received: from [216.57.118.94] (helo=ccaselt2) by elasmtp-junco.atl.sa.earthlink.net with asmtp (Exim 4.34) id 1IoSJh-00011C-Ux for lml@lancaironline.net; Sat, 03 Nov 2007 19:22:14 -0400 X-Original-Message-ID: <16fe01c81e70$5b4afa70$0302a8c0@nvidia.com> From: "Colyn Case on earthlink" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] Re: beam spread table X-Original-Date: Sat, 3 Nov 2007 19:22:08 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_16FB_01C81E4E.D394DD10" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198 X-ELNK-Trace: 63d5d3452847f8b1d6dd28457998182d7e972de0d01da940da82829f4ff018a40567cb84d8fd651e350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 216.57.118.94 This is a multi-part message in MIME format. ------=_NextPart_000_16FB_01C81E4E.D394DD10 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable good point. I'll fix it. ----- Original Message -----=20 From: Sky2high@aol.com=20 To: lml@lancaironline.net=20 Sent: Saturday, November 03, 2007 7:04 PM Subject: [LML] Re: beam spread table In a message dated 11/3/2007 9:06:58 A.M. Central Daylight Time, = colyncase@earthlink.net writes: If I did the math correctly, this is what you get from the 3 ansi = designations for lights. beam spread (degrees) tan(beam spread) beam width at 100' = (feet) beam width at 200' (feet) beam width at 300' (feet) beam width at = 500' (feet)=20 ideal taxi? 30 0.577 58 115 173 289=20 ideal landing? 10 0.176 18 35 53 88=20 eyf 12 0.213 21 43 64 106=20 eyj 25 0.466 47 93 140 233=20 eyc 40 0.839 84 168 252 420=20 Colyn, Since the beam forms an isosceles triangle your formula in column C = should be 2*tan(radians(angle/2)). The widths are somewhat different = for wider angle beams. =20 I use a 12V 100W Halogen MR16 EMC (can't find the angle info) on the = left leg for landing/taxiing and a GE quartz 12V 100W (Q4509?, 7 - 10 = degree spread) cowling mounted lamp for approach/taxiing. The GE = provides good lighting of the runway on approach but disappears from = view on flare (can't see over the nose) and the leg light beautifully = illuminates the area I can see down and to the left. I had pictures = taken at night, but I can't find them at this time. =20 Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) -------------------------------------------------------------------------= ----- See what's new at AOL.com and Make AOL Your Homepage. ------=_NextPart_000_16FB_01C81E4E.D394DD10 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
good point.  I'll fix it.
----- Original Message -----
From:=20 Sky2high@aol.com=20
Sent: Saturday, November 03, = 2007 7:04=20 PM
Subject: [LML] Re: beam spread=20 table

In a message dated 11/3/2007 9:06:58 A.M. Central Daylight Time, = colyncase@earthlink.net=20 writes:
If I did the math correctly, this = is what you=20 get from the 3 ansi designations for lights.
 
  beam spread (degrees) tan(beam spread) beam width at 100' (feet) beam width at 200' (feet) beam width at 300' (feet) beam width at 500' = (feet)
ideal taxi? 30 0.577 58 115 173 289
ideal landing? 10 0.176 18 35 53 88
eyf 12 0.213 21 43 64 106
eyj 25 0.466 47 93 140 233
eyc 40 0.839 84 168 252 420
 
 
Colyn,
 
Since the beam forms an isosceles triangle your formula in column = C=20 should be 2*tan(radians(angle/2)).   The widths are = somewhat different for wider angle beams. 
 
I use a 12V 100W Halogen MR16 EMC (can't find the angle = info) on the=20 left leg for landing/taxiing and a GE quartz 12V 100W = (Q4509?, 7 -=20 10 degree spread) cowling mounted lamp for approach/taxiing.  The = GE=20 provides good lighting of the runway on approach but disappears from=20 view on flare (can't see over the nose) and the leg light=20 beautifully illuminates the area I can see down and to the=20 left.  I had pictures taken at night, but I can't find them at = this=20 time.   =20
 
Scott=20 Krueger AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL=20 (KARR)




See what's new at AOL.com=20 and Make AOL Your=20 Homepage.
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