Small update on this one:
Reworked it with Newton Fields on each propeller marker Used as Source which push it upwards on each propeller. The top fins also use the same field, but a little less strong. Now it’s being held in the air by seperate pin constraints on the front fins with translation constraints only. And a pin on the front body that only constraints rotation slightly to keep it upright. The fields are also limited by attenuation and max distance.
Fun thing that I’ve discovered is that markers weight increase with rotation as mentioned somewhere in the documentation. So the Newton Field pushes the drone higher the faster the propellers rotate as their mass increase and has more influence on the rest of the markers.
Additionally there is a semi custom Speed rig running that tracks drone’s speed and tilts the drone forward/ backwards depending on the percentage of change in it’s speed to replicate breaking/ accelerating.
The tip we discussed here about adjusting marker’s pivots was life saving when working with this and other rigs, which are mostly not bones based.