I’ve decided that the dual rotor setup is the way to go because it is simple and it better utilizes the ellipse footprint under the balloon. I would need propellers regardless and larger propellers are the only ones I can get quiet. The rotors are large but they don’t extend beyond the edges of the balloon which will hopefully make it safer. The large diameter props require less RPM to generate the lift needed and they are very quiet. The issue is that they aren’t perfectly balanced which creates some vibrations. They are very quiet other then these vibrations so I should be set once this issue is solved.

The current demand is also concerning though. The Esp32 and the motors will probably pull a combined 10 watts so I’ll need to get creative with the battery power. It stands upright when on a desk because all the weight is at the bottom. I’m sure I could have it fly over and land where you are sitting. Then it would be completely silent and this would be a funny part of its personality (similar to an attention seeking pet). It is very light so it falls slowly and the propeller hubs hit the ground first. The lightweight, low RPM propellers are harmless and it could probably take off again if I design the propellers correctly. It might even be able to “walk” while grounded if I toggle the motors because of how light it is.