To workout the distance travelled you need ….

1. Speed, in Knots which is nautical miles per hour. 

2.  and a Time in minutes.

In this example we have calculated your speed to be 120 Knots and you have been flying for 45 minutes.

On the Wizz wheel, Distance is on the outside and time is always on the inside.

1. Speed of 120kts on the outside (which is Distance travelled in an hour)

2. so, Time is on the inside, line-up the Hour [60 MIns].

Now we have a Distance and Time Ratio setup …

3. Find the time of 45 minutes on the inside (as time is on the inside).

4. Read off the Distance on the outside of 90 nm.

18.22.8 List and explain the uses of:
(a) a Mercator projection;
(b) a Lambert's conformal projection;
(c) the various New Zealand aeronautical charts;
(d) the aerodrome charts and associated operational data pages.

.

a

18.8.6 State the speed provided by a GNSS and inertial system.

.

(a) time and distance to the point of no return (PNR)

The Point of No Return (PNR) is the greatest distance that an aircraft can proceed and return to ADEP with the required reserve fuel.
After passing the Point of No Return the remaining fuel will not be sufficient for a return to the point of departure.
The flight can only be continued to ADES or to an alternate airfield.

To have a quick look at how to calculate your Point of No (safe) Return,
lets consider a flight from Auckland to Norfolk Island a Distance of around 580nm.
And the aircraft TAS is 200 kts and 4 Hours safe endurance.

No wind

In a no-wind situation it is easy it is the PNR point is just half of your endueance which is 2hours.  2hours at 200kts = 400nm.

We loose out when we have wind in to the situation which we always seem to have.

Head wind

Tail Wind 

To work out the time required you need ….

1. Speed, is in Knots which nautical miles per hour.

2. Distance to intend to travel.

In this example we have calculated a Speed of 120 Knots and a Distance of 60 nautical miles to fly.

On the Wizz wheel, Distance is on the out side and time is on the inside.

1. Speed of 120kts on the outside (which is Distance travelled in an hour)

2. so, Time on the inside finds the Hour [60 MIns].

Now we have a Distance and Time Ratio set up you can easily work out the time required as follows

3. Find the Distance on the outside.

4. Read off the Time on the in side.

Notes: easy to work out any Distance and Time relationship

a

18.10.8 Locate a position on a chart.
(a) from an NDB given magnetic direction to and distance from;
(b) from a VOR given radial and DME distance.

.

18.8.4 Explain how TAS is affected by changes in pressure altitude, air temperature and air
density.

Quizz One