PROCEDURE:
- Climb to 2000 MSL (or nearest thousand foot increment above ground level).
- Slow to minimum controllable airspeed (MCA).
- Find a prominent landmark, and create a waypoint for it on a GPS.
- Fly south of the landmark for one minute, then turn to pass directly over the landmark.
- Upon crossing over the landmark, turn to a heading of 360 degrees and begin timing.
- As soon as your GPS indicates one mile from the landmark, create another GPS waypoint, and stop the stopwatch.
- Fly past the fix for one minute, then turn to pass directly over the fix.
- Upon crossing the one mile fix, fly a heading of 180 and start timing again.
- Upon crossing over the original landmark, stop timing.
- Add the two times, and divide by two. This will give you the average time to fly one mile (the average will negate the effects of wind).
- Speed = (Distance / Time), so your actual airspeed will be (1 mile / average time between fixes).
- Repeat for every ten MPH increment between MCA and Vne.
