Reinventing the wheel

Actually, they have these. See:

http://www.kamov.ru/second/52.html

Катапультируемые кресла с ракетно-парашютной системой позволяют обоим членам экипажа в аварийной ситуации покидать вертолет на всех режимах полета, во всем диапазоне скоростей и высот полета.

Which Google says means:

Ejection from the rocket and parachute system allows both members of the crew in an emergency situation, to leave the helicopter at all regimes of flight, the entire range of speeds and altitude.

Still, these wheels are a stupid idea. And I wouldn't want to try that seat either!