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The Advancing Blade Concept system consisted of two rigid, contra-rotating rotors (30 inches apart) [9] which made use of the aerodynamic lift of the advancing blades. At high speeds, the retreating blades were offloaded, as most of the load was supported by the advancing blades of both rotors and the penalty due to stall of the retreating ...
Dragonfly is designed as a rotorcraft lander, much like a large quadcopter with double rotors, which is known as an octocopter. [3] The rotor configuration provides redundancy to enable the mission to tolerate the loss of at least one rotor or motor. [3] Each of the craft's eight rotors is 1.35 m (4.4 ft) in diameter.
After damaging a rotor blade, NASA’s Ingenuity helicopter mission ends on Mars. Ashley Strickland, CNN. January 25, 2024 at 9:57 PM. Sign up for CNN’s Wonder Theory science newsletter.
[1]: 2–14 Rotor blades are designed to flap: the advancing blade flaps up and develops a smaller angle of attack due to a change in relative wind vectors, thus producing less lift than a rigid blade would. Conversely, the retreating blade flaps down, develops a higher angle of attack due to a change in relative wind vectors, and generates ...
Rotor map of dynamic stall locations for all conditions. Stage 4: full separation of the flow on the upper surface of the airfoil can be observed, accompanied by the peak of nose-down pitch moment. Stage 5: the full flow reattachment is achieved as the AoA gradually decreases until it is fairly smaller than the static stall angle. [10]
A rotor blade produces more lift in the advancing half. As a blade moves toward the direction of flight, the forward motion of the aircraft increases the speed of the air flowing around the blade until it reaches a maximum when the blade is perpendicular to the relative wind. At the same time, a rotor blade in the retreating half produces less ...
Sikorsky developed the X2 helicopter on a $50 million budget. The design includes expertise gathered from several earlier design projects. The S-69/XH-59A Advancing Blade Concept Demonstrator had shown that high speed was possible with a coaxial helicopter with auxiliary propulsion supplied using two jet engines, but that vibration and fuel consumption was excessive; [2] [3] [4] the Cypher UAV ...
The joint NASA/Army project began in December 1970, first flight on October 12, 1976, with the first of two aircraft arriving from Sikorsky to NASA on February 11, 1979. One notable test performed with the RSRA was the use of the main and tail rotor load measurement system to determine the vertical drag of the airframe.