X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 30 May 2006 20:58:00 -0400 Message-ID: X-Original-Return-Path: Received: from rwcrmhc13.comcast.net ([216.148.227.153] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTP id 1132909 for lml@lancaironline.net; Tue, 30 May 2006 09:49:49 -0400 Received-SPF: none receiver=logan.com; client-ip=216.148.227.153; envelope-from=mjrav@comcast.net Received: from mark1 (c-24-91-12-165.hsd1.ma.comcast.net[24.91.12.165]) by comcast.net (rwcrmhc13) with SMTP id <20060530134904m13009u9mte>; Tue, 30 May 2006 13:49:04 +0000 X-Original-Message-ID: <004001c683f0$e1a16bc0$a50c5b18@mark1> From: "Mark Ravinski" X-Original-To: "Lancair Mailing List" References: Subject: Re: [LML] knots to you X-Original-Date: Tue, 30 May 2006 09:56:41 -0400 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003D_01C683CF.5A1D33D0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1807 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1807 This is a multi-part message in MIME format. ------=_NextPart_000_003D_01C683CF.5A1D33D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Paul, I'm with you. I'm calibrated in MPH (statute) However, a little background. One nautical mile is exactly one minute mark on the vertical scale of a = marine (or aviation) chart. This doesn't work with the horizontal scales as they shrink towards the = poles. Having this simple measure so readily available, the early navigators = fell into using Knots. It still is very useful when using charts. Mark Ravinski ----- Original Message -----=20 From: Paul Lipps=20 To: Lancair Mailing List=20 Sent: Tuesday, May 30, 2006 7:13 AM Subject: [LML] knots to you Hi, Dom! My car's speedo is in mph and so is my ASI. I use rulers with = feet and inches; they are the measures that make the most sense to my = mind. Those I can picture, with the others I have to make a mental = conversion into the ones I know. I think it was totally stupid to start = using knots for measuring speed. It had nothing to do with what people = in this country used on a day-to-day basis. Our vehicles we use for our = transportation are in mph or kph; if it exists, I've never seen a car = speedo calibrated in knots! The planes I started on were in my old = comfortable mph. I know the conversions to knots, ft/sec, km, cm, mm, = hp, torque, BTU, joules, rad/sec, UTC, UT1, sidereal rate, F number, = etc, etc, etc! But when I fly, I want to concentrate on the familiar, = not "Let's see, 1.151 statute miles/nautical mile." If you're trained on = nautical miles per hour, and that's what you are comfortable with, then = by all means use it. But since we have so many different measuring = systems in use around the world, it seems to me it would behoove anyone = who wants to progress in aeronautical knowledge to become familiar with = the conversion factors. ------=_NextPart_000_003D_01C683CF.5A1D33D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Paul,
I'm with you.  I'm calibrated in = MPH=20 (statute)
However, a little = background.
One nautical mile is exactly one minute = mark on the=20 vertical scale of a marine (or aviation) chart.
This doesn't work with the horizontal = scales as=20 they shrink towards the poles.
Having this simple measure so readily = available,=20 the early navigators fell into using Knots.
It still is very useful when using=20 charts.
 
Mark Ravinski
----- Original Message -----
From:=20 Paul=20 Lipps
Sent: Tuesday, May 30, 2006 = 7:13 AM
Subject: [LML] knots to = you

Hi, Dom! My car's speedo is in mph and so is = my ASI. I=20 use rulers with feet and inches; they are the measures that make the = most=20 sense to my mind. Those I can picture, with the others I have to make = a mental=20 conversion into the ones I know. I think it was totally stupid to = start using=20 knots for measuring speed. It had nothing to do with what people in = this=20 country used on a day-to-day basis. Our vehicles we use for our = transportation=20 are in mph or kph; if it exists, I've never seen a car speedo = calibrated in=20 knots! The planes I started on were in my old comfortable mph. I = know the=20 conversions to knots, ft/sec, km, cm, mm, hp,  torque, BTU, = joules,=20 rad/sec, UTC, UT1, sidereal rate, F number, etc, etc, etc! But when I = fly, I=20 want to concentrate on the familiar, not "Let's see, 1.151 statute=20 miles/nautical mile." If you're trained on nautical miles per hour, = and that's=20 what you are comfortable with, then by all means use it. But since we = have so=20 many different measuring systems in use around the world, it seems to = me it=20 would behoove anyone who wants to progress in aeronautical knowledge = to become=20 familiar with the conversion factors. =
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