Return-Path: Sender: (Marvin Kaye) To: lml Date: Sat, 15 Mar 2003 21:38:43 -0500 Message-ID: X-Original-Return-Path: Received: from [32.97.166.32] (HELO prserv.net) by logan.com (CommuniGate Pro SMTP 4.0.6) with ESMTP id 2053723 for lml@lancaironline.net; Sat, 15 Mar 2003 14:13:23 -0500 Received: from b8p5r1 (slip-12-66-2-189.mis.prserv.net[12.66.2.189]) by prserv.net (out2) with SMTP id <2003031519131420206cdssve>; Sat, 15 Mar 2003 19:13:15 +0000 From: "Larry Henney" X-Original-To: "'Lancair Mailing List'" Subject: RE: [LML] Re: Sun n Fun Race length, coordinates, etc X-Original-Date: Sat, 15 Mar 2003 13:17:06 -0600 X-Original-Message-ID: <00c101c2eb27$78f0e3e0$bd02420c@b8p5r1> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00C2_01C2EAF5.2E5673E0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.2627 X-MimeOLE: Produced By Microsoft MimeOLE V5.00.2919.6600 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_00C2_01C2EAF5.2E5673E0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Lorn Writes: I calculate the length of the Lakeland 100 mile race at 76.1 nm or 87.5 statute miles. Gentleman, It is true that GPS distances are 6 miles less than course computed speeds. I suspect that 2 miles were added to each of 3 x 120 deg turns (or 2 x 120 turns and 2 x 60 deg turns depending on how you look at it). This increase in distance is arguable based on speed & G (varying turn radii). Although it has to be somewhat arbitrary (varying bank angle) , the fact that it exists is accepted and added to triangle courses. No airplane that I'm aware of could simply turn on a dime (accept the NASA HARV-F/A-18) We used to use a Combat Plotter in the Navy that had speed and bank angle distances. It had 1 NM tick marks around the radius of the turn. This way you could fly up to a visible turn point and turn with a known distance. This would make low level ingresses accurate to within a few seconds with very little pilot skill required (which was very helpful to me of course). Hope this helps to clarify and minimize "the timers cheated" syndrome from lack of understanding. Larrry Henney N360LH My plaque reads 209.96 Kts I claim with a straight face that it flew and flys 210 kts. ------=_NextPart_000_00C2_01C2EAF5.2E5673E0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Message
 
 Lorn Writes:
 
 I calculate the = length of the=20 Lakeland 100 mile race at 76.1 nm or 87.5 statute miles.

 Gentleman,
 
It=20 is true that GPS distances are 6 miles less than = course computed=20 speeds.  I suspect that 2 miles were added to each of = 3 x 120=20 deg turns (or 2 x 120 turns and 2 x 60 deg turns depending on=20 how you look at it). 
 
This=20 increase in distance is arguable based on speed & G (varying = turn=20 radii).  Although it has to be somewhat arbitrary = (varying bank=20 angle) , the fact that it exists is accepted and added=20 to triangle courses.  No airplane that I'm aware of could = simply=20 turn on a dime (accept the NASA HARV-F/A-18)  We used to use a=20 Combat Plotter in the Navy that had speed and bank angle=20 distances.  It had 1 NM tick marks around the radius of the = turn. =20 This way you could fly up to a visible turn point and turn with a = known=20 distance.  This would make low level ingresses accurate to = within a=20 few seconds with very little pilot skill required (which was very = helpful to=20 me of course). 
 
Hope=20 this helps to clarify and minimize "the timers cheated" syndrome = from=20 lack of understanding.
 
Larrry Henney
N360LH
My=20 plaque reads 209.96 Kts
I=20 claim with a straight face that it flew and flys 210 = kts.
 
 
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