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Samples in periodicals archive:
Boeing-Sikorsky is building the SB-1 Defiant, a coaxial helicopter featuring counter-rotating rigid main rotor blades on top and a pusher propeller in the rear
] coaxial design, a fly-by-wire controlled helicopter that features counter-rotating main rotor blades for lift and forward flight, and a pusher propeller for high speed acceleration and deceleration.
Contract Awarded for The repair of 12 gearbox assemblies, 12 Cobra main rotor hub assemblies, 60 Cobra main rotor blades, 11 right hand stub wings, and 10 left hand stub wings required to support the H-1 helicopter
Designed by Sikorsky to test main rotor blades that rotate either clockwise or counterclockwise, the bi-directional whirl tower will enable helicopter operators and manufacturers to rebalance their rotor blades in the U.
The equipment rolled toward a taxiing helicopter a short distance away and inevitably headed under the tip-path of the rotating main rotor blades.
4/19/2011 SH-60B Main rotor blade damaged during fold evolution using blade fold test set.
Fourteen passengers and two crew were returning from BP's Miller platform when the helicopter crashed in the sea, 11 miles north east of Peterhead, The main gearbox suffered a "catastrophic failure" which caused the main rotor blades to shear off.
The main rotor blades struck each other and as a result Puma One's tail boom broke and debris from the broken blades was launched into the air.