Did some calculations on the ingenuity-heli, using this model:
https://mars.nasa.gov/resources/25043/m ... -3d-model/
I tried to reconstruct the wing-profile from the obj-file.
At 2400 rpm the wing segment in the middle moves with approx 75 m/s. At this speed
and this Angle of Attack the segment produces practically no lift.
heli-mass=1,8 kg, required lift on Mars approx 6,8 N (equals 680 gramm).
Sounds like nothing, but atmospheric density is only 0,015 kg/m^3 (earth 1,25 kg/m^3).
How do they handle this?
At 2400 rpm a imbalance of 1/10 gramm at rotor-tip produces more than 3 N horizontal force.
Half of the heli-weight.
Solar input at mars ground level approx 500 W/m^2.
Solar-panel area approx 640 cm^2. Efficiency 25%, gives power output of 10 Watt to reload accus.
Thats not much...
Only one fixing at the gear, how is it balanced? Active control?