NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Two body Sandwich Fix Proforma
From: Gary LaPook
Date: 2014 Nov 17, 16:09 -0800
From: David Pike <NoReply_DavidPike@fer3.com>
To: garylapook@pacbell.net
Sent: Monday, November 17, 2014 1:21 PM
Subject: [NavList] Re: Two body Sandwich Fix Proforma
Attached File:
(Where-the-x6-comes-from.JPG: Open and save)
From: Gary LaPook
Date: 2014 Nov 17, 16:09 -0800
I did the same calculation slightly differently last night and came up with the same answer, see attached. I am also attaching the page from the U.S. Air Force Navigation manual that show the defection of the vertical is 1.5' for a ground speed of one knot in a TWO MINUTE period which is half the acceleration of the one minute period so 1.5 x 2 also equals 3' per knot in one minute.
I am now trying to work our the formula for the wander (change in track) correction.
gl
From: David Pike <NoReply_DavidPike@fer3.com>
To: garylapook@pacbell.net
Sent: Monday, November 17, 2014 1:21 PM
Subject: [NavList] Re: Two body Sandwich Fix Proforma
In the message below I sent a copy of the Vulcan Force seven star sandwich fix proforma, and I stated I couldn’t work out why the change in IAS knots during a one minute shot had to be multiplied by six to give a correction in minutes of arc to a LOP
intercept. Well I think I’ve worked it out. Please see the snap below. The proof and no doubt the proforma make two rather large assumptions, first that the astro will be shot around 40,000ft where TAS is very close to twice IAS, and second that any change in TAS is equal to the change in groundspeed. I’ve not opened a maths textbook for 30 years. Have I got the maths correct?
Attached File:
(Where-the-x6-comes-from.JPG: Open and save)
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