This is a technical ops question. I was on holiday in AUS over your winter and we flew ADL-KGC-ADL 2142 of 29-Jul-22 and 2143 of 02-Aug-22. When looking at our flights on FlightRadar24, I noticed that the speed was very inconsistent and bounces around especially during takeoff and landing. In the attached graphs, the KGC end is not displayed, most likely due to unavailable data from a remote / lo volume airport. If you notice, in the takeoff from ADL, there are a few small areas where speed actually decreases.

Using a video I made out the window of our landings and takeoffs, I was able to plot some estimated points by comparing the image out the window to a google maps image, and using the time between points in the video. I got very similar results, with the speed carrying greatly.

A family member is a commercial pilot here in the USA so I asked him about this. His response was that many small aircraft lack auto-throttle and auto-pilot, but he couldn't speak for the QF DH3 (or any DH3 specifically). He said that a lack of these features could definitely cause variations like this. I thought maybe it had something to do with a plane with a smaller powered engine being affected more by the winds. My other theory is that the data is inaccurate most likely due to FR24's lack of access.

If anyone has any technical knowledge about this aircraft, could you please comment on these graphs and let me know what you think? I'd like to use these flights for a presentation project, but don't want to go to the trouble if the data is wrong.