To Dave
To save on (potential) victims the following thoughts:
- as the blades cone progressively the pen will show the increase from rest to max coning
- if they would flap then they have to go negative, which in view of the hard stops (remeber the not pull down instruction) will create victims even without putting BIC pens to the bolts
The reason/conditions why they are coning is
- The blades are sufficiently equal in weight
- The excentricity is small but not too small so the the centrifugal forces have some leverage
- No unreasonable frictions (bolts stuck or so)
Then
- the centrifugal force will create an equilibrium that makes the hub take the average position between the two blades (try this out on a static model, the centrifugal forces will flatten it so to speak)
Remember centrifugal force are at the root the dominant forces. These forces are equal because any inbalance in centrifugal forces great enough to make the hub unequilibred will be able to shake the heli apart.
Delta3