For the record, here’s 9 sequential flights, with each lasting 10s: 3s ascent at 0.3m/s, 4s hoverand 3s descent at 0.3m/s. The drift is different in each. There are actually only 8 flights in the video; the 9th is not in the video: she never took off and lost WiFi so I had to unplug her and take her indoors. I may post it tomorrow, though it mostly consists of me grumbling quiets while I pick her up with my arse facing the camera!
Hermione had Garmin and RaspiCam disabled – videoing the ground for lateral tracking is pointless if the height is not accurately known.
On the plus side, the new foam balls did an amazingly successful job of softening some quite high falls.