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War Department Air Corp Forms No. 21
Spoiler
Form No. 21 J (Precomputed Curve Plotting Sheet)
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Form No. 21 K
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Form No. 21 N (Radio Message Blanks)
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Form No. 21 P (Star Altitude Curves Work Sheet)
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Form Nos. 21 Q & 21 R (Great Circle Solutions by Ageton)
21Q 
Form for solution Great Circle Flying
Соответствует бланку Form No. 21Q
NavLog0.zip 185.68KB
43 downloads
NavLog1.zip 215.89KB
34 downloads
NavLog2.zip 25.65KB
37 downloads
Form No. 21Q
Расчёт начального курса и длины ортодромии
Схема и описание расчёта
Form No. 21R
Расчёт промежуточных точек (ППМ) ортодроми
Пример использования: Расчёт локсодромии при помощи «Useful tables from the American practical navigator»
Схема расчёта:
Пример использования: Определение координат светила по “American Air Almanac 1946” и “Altitude and Azimuth Table”
21D 0.zip 129.38KB
30 downloads
21D 1.zip 185.35KB
27 downloads
Расчёт азимута и расстояния по средней широте
Схема расчёта:
Соответствует бланку Form No. 21Q
NAVIGATION TRIANGLE USING THE AGETON METHOD
In the nineteen thirties, Lt. Arthur A. Ageton, United States Navy, proposed a method for solving the navigation triangle. He dropped a perpendicular from one corner of the oblique spherical triangle to the meridian of the observer (or point of departure) to form two right triangles, and did a solution using secants and cosecants only. This was an advantage because the logarithms are always positive. To use this system, a special set of tables called the Ageton tables are required. It was also published by the U. S. Navy Hydrographic Office as publication «HO-211«.
When sailing from point 1 (L1, LO1) to point 2 (L2, LO2)
t = DLO = difference in longitude (degrees)
R = length of the perpendicular
K = distance from the equator to the perpendicular as measured along the meridian of point one
D = distance from point 1 to point 2 (degrees)
C = course angle at point 1
csc R = csc t * sec L2 ( R is less than 90 degrees )
csc K = csc L2 / sec R (note 1)
sec D = sec R * sec ( K-L1 )
csc C = csc R / csc D (note 2)
Turning the equations over and converting to the sine cosine format, we get a set of formulas usable on a calculator.
sin R = sin t * cos L2 ( R is less than 90 degrees )
sin K = sin L2 / cos R (note 1)(note 3)
cos D = cos R * cos (K-L1)
sin C = sin R / sin D (note 2)
(note 1) If t is greater than 90 degrees then K is greater than 90 degrees.
(note 2) If L1 is greater than K then C is greater than 90 degrees.
(note 3) If only the course angle is required, Tan C = tan R / sin (K-L1) If L1 is greater than K, C will be a negative angle and the correct answer will be C+180 degrees.
Комментарии к методу Ageton’s Tables for Sight Reduction
Таблицы в файле PDF
APPB.zip 2.25MB
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Примеры страниц
Position Plotting Sheet
Pos Plotting Sheet.zip 40.45KB
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