I don't fly helicopters in real life but Ironically, I had flown them extensively in a commercial simulator used in flying schools and practiced various in flight emergencies and recovery procedures. I've also taken the hobby of flying RC helicopters in the past and I flew them "manually" that is without relying on electronic aids.
My observation and analysis of the accident is that the tail rotor or tail boom seemed to have failed first or the pilot or the passenger at the front seat either accidentally or deliberately pushed the rudder pedals (the one that controls the tail rotor) to the limits until the tail boom broke off due to large inertia and aerodynamic forces.
The violent response of the helicopter from the tail failing and/or swinging violently caused the main rotor to separate and doomed the flight.
My recommendation not to fly nor learn on Bell 206 or any two bladed main rotor helicopters like Bell 212 (UH-1 in the armed forces) or Robinson R22/44 comes next.
Two bladed rotor helicopters are simply much more vulnerable in more flight conditions (including high levels of turbulence, accidental large unintended control inputs, in-flight failures) that 3 or more bladed rotor helicopters are not.
If you accidentally kicked the control column and got stuck in that position for a moment, 3+ bladed helicopters would probably just dive which can be corrected and the flight saved if not too late. Do this on a 2 bladed rotor helicopter, the rotor blade would probably start tilting down at extreme angles until the rotor separated from the helicopter or the blades slicing the cockpit and decapitating the occupants at the front seat.
The only reason the industry are still producing two bladed rotors is because they're the cheapest type of helicopter rotor. Except for the cheapest and simplest, new helicopter models for manned operation have discarded two bladed rotors.
It's so easy to make fatal mistakes on 2 bladed rotor helicopters even in perfect flying conditions with the helicopter in perfect mechanical condition. The rotor system is a horrible design from a safety perspective.
If the Hudson river helicopter tail failure occurred on a 3+ bladed helicopter. The main rotor would probably remain attached even if the tail boom broke off. there's a slim chance of survival if the pilot is able to react quickly and correctly to the situation. As long the main rotor is attached and the helicopter is still in a relatively level attitude, it has good chance of making a survivable crash landing or even a soft landing even with missing tail boom via "auto rotation"
Unfortunately, on the 2 bladed rotor Bell 206 helicopter, their fate was sealed the moment the tail boom broke because it would be expected the violent event would cause highly vulnerable 2 bladed main rotor to break off.
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