Over here:
https://github.com/paulross/pprune-c...ster/A340-SBKP It concludes that the aircraft became airborne with 198 ±25m of runway left.
Specifically:
- The takeoff started 34.2 ±1.4 seconds before the beginning of the video with the aircraft 75 ±159m from the start of the runway.
- At the start of the video the ground speed is 113 ±5 knots. The aircraft is 1110 ±25m from the start of the runway with 2130 ±25m of runway remaining.
- When the nose wheel comes off the ground speed is 159 ±5 knots with 865 ±25m of runway remaining.
- The rotation rate at this point is +1.4 degrees/second for the next 5 seconds to +7 degrees.
- When the main wheels come off the ground speed is 176 ±5 knots with 198 ±25m of runway remaining.
- The takeoff roll took 59.8 ±1.4 seconds.
- The aircraft crosses the end of the runway 2.2 seconds later at a ground speed of 180 ±5 knots.
- At 29 seconds there is a further pitch increase of +1.4 degrees/second from +7 to +12 degrees.
- The useful part of the video ends at t=35.7 seconds, the ground speed is 193 ±5 knots and the aircraft is 755 ±25m beyond the end of the runway 15.
- The observer is within 25 metres of Latitude -23.011945, Longitude -47.115872
Here is the data plotted on an image of Viracopos International Airport from Open Street Map. The red boxes illustrate the accuracy of the position estimate. The probable location of the observer is also shown, the black lines are transits that establish that position.
The annotations in blue contain:
- v= The ground speed in knots.
- t= The time as video time, followed by [...], the estimated time from start of takeoff.
- d= The distance from the start of the runway, followed by [... to go], the distance to the end of the runway.
Annotated OpeStreetMap image of Viracopos International Airport