Some pet calculations for division..

For example what is 15 / 3 = ??

To calculate this on the wizz wheel, setup 15 over 3 and now you have a ratio. Simply find the 1 or 10 on the inside and, the  answer is on the outside.

Example 1. 

1. Find the 15  on the outside scale 

2. On the inside line up the 3 or 30

18.48.8 Estimate and calculate an aircrafts position given bearing and distance from an
identified ground position.

18.46.8 State the legal minimum fuel reserves required on a VFR cross-country flight.

The AIP VOL4 contains information on aerodromes and procedures, as well as much more. Each airport in NZ has a page in the VOL4 with all the information you would need to visit there and fly the local procedures. 

An example of an aerodrome in VOL4 is as follows

The VOL4 symbols are as follows

Pressure altitude is the altitude displayed when 1013 hPa is set on the altimeter sub scale barometer. It is the height above a standard datum. 

Pressure Altitudes are commonly referred to as Flight Levels. 

Latitude describes the location of a place north or south of the equator. The North Pole is +90 degrees and the South Pole is -90 degrees. A line connecting all the points with the same latitude value is called a parallel of latitude

Longitude describes the location of a place east or west from the Prime Meridian, a line which runs between the poles and through Greenwich, England. Longitude increases as you leave the Prime Meridian (0 degrees) going east (0 to 180 degrees) and decreases as you head west (0 to -180 degrees), until they meet at 180 degrees. 

Calibrated airspeed, is IAS corrected for pressure or position error (sometimes referred to as instrument error); which arises from the location of the static port (where we read the static pressure) 

Latitude describes the location of a place north or south of the equator. The North pole is +90 degrees and the South pole is -90 degrees. A line connecting all the points with the same latitude value is called a line of latitude; creating parallels of
latitude, lines parallel to the equator. 

Here we will look at the Formula for the Equi-Time Point.

Equi-Time Point = ( frac{Distance x Ground Speed Home}{Ground Speed Out + Ground Speed Home} )

Start by focusing in on the right side of this formula, where they have set up a ratio using the Ground Speeds.

( frac{1}{1+1} )  or ( frac{1}{2} ) Which Halfway or .5 
( frac{GS Home}{GS out +GS Home} )  GS Out and GS Home are the same the then equal to Halfway or .5 

Working with a Head Wind our ground home is more than our ground speed out

( frac{GS Home=2}{GS out=1+GS Home=2} ) = ( frac{2}{1 +2} ) = ( frac{2}{3} ) now our ETP is passed Halfway or .66

Working with a Tail Wind our ground home is less than our ground speed out

( frac{GS Home=1}{GS out=2+GS Home=1} ) = ( frac{1}{2 +1} ) = ( frac{1}{3} ) now our ETP is before Halfway or .33

Complete the formula by just multiplying the flight distance with this Ratio to get your Equi-Time Point.

To get this to work on your Nav Computer there is a slight change,

( frac{Equi-Time Point}{Distance} = frac{Ground Speed Home}{Ground Speed Out + Ground Speed Home} )

Start off with setting up the Ratio.

With “Ground Speed Home” on the outer side scale.

and  “Out Speed Home” + “Ground Speed Home” on the inside scale.

then look around on the inside scale for your flight’s distance

and read the Equi-Time Point / distance off on the out side scale.

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