Following the crash, the European Aviation Safety Agency ordered that safety checks should be carried out on the tail rotors
of AW169 helicopters and similar models.
Because the rotary speed is constant, in order to study the noise of the ducted tail rotor
, we focus on the flow field in stable state.
According to the AAIB: "The investigation is therefore of the opinion that the helicopter did not enter an uncontrollable spiral immediately following loss of the tail rotor
NAVAIR viewgraphs subsequently showed VXX Increment 2 with new rotor blades, a refined tail rotor
and other structural changes.
10 in., diameter of main rotor 48 ft., diameter of tail rotor
Some of the ways of reducing noise levels generated by flying helicopters include the reduction of the number of revolutions of the main and tail rotor
, active control of the main rotor blades, replacement of the classical tail rotor
by the rotor of the Fenestron form or NOTAR (no tail rotor
The Squirrel had been forced out the sky on Tuesday after damaging its tail rotor
while doing mountain training in the area.
The tail rotor
failed on a helicopter being flown by Mr Dennis Kenyon, of Shoreham-by-Sea, Sussex, at the Biggin Hill Air Fair in Kent last summer.
For more than three decades, Chicago Rawhide has supplied helicopter manufacturers with elastomeric bearings for carrying the loads and motions of main rotor and tail rotor
The defects led to the tail rotor
blades' pitch being changed "till they reached the physical limit", said the Air Accidents Investigation Branch.
"The Australian flight crew was in the process of netting a cow elk, which jumped and hit the tail rotor
of the helicopter," according to a statement from Wasatch County Search & Rescue, (http://www.ajc.com/news/national/elk-downs-helicopter-crew-tries-capture-near-utah-reservoir/cEEZ1GT7Pkz7SugyDlKSbO/) AJC reported.