Formulas Flashcards by Izzy F | Brainscape

Q

How many feet in 1 NM?

A

6080ft

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Q

How many km in 1 NM?

A

1.852km

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Q

What is the ICAO definition of NM?

A

1852metres

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Q

How many KG to a lbs?

A

0.454kg

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Q

How many NM in 1ø of latitude?

A

60NM

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Q

How many NM in 1’ (minute)?

A

1’ = 1 NM

As 1ø = 60NM, then 1’ = 1NM

So 1’ = 1NM = 6080ft = 1852m

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Q

What is the radius of the earth?

A

5400 NM or 10,000km

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Q

What is the circumference of earth?

A

21,600NM or 40,000km

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Q

What is the ellipticity, or 1/f?

A

Compression axis 1 in 298

298 major axis
297 minor axis

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Q

What is the length of the equatorial radius (ER)

A

3444nm or 6378km

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Q

What is the length of the polar radius (PR)?

A

3432nm or 6356km

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Q

What is the formula for Departure?

A

Departure (NM) = Chlong’ (mins) x cos lat

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Q

What is the formula for convergency?

A

Convergency = Chlong˚ (degrees) x sin (mean) lat

Where mid lat is the average between the 2 given latitudes.

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Q

How many ft in a km?

A

3280ft

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Q

How many feet in a statute mile?

A

5280ft

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Q

How many lbs to a KG?

A

2.205lbs

Q

A NM is longer at the EQ or poles?

A

The poles because the earth is flatter at the poles.

Q

What is the length of a NM at the poles?

A

1852m (ICAO std) or

6108ft

Q

What is the length of a NM at the EQ?

A

1843m or

6046ft