Rotor Wings Week 3 Fam Review PDF

Droop compensator is more complex than correlator. Correlator is a mechanical linkage between the collective and the throttle. Two different vibration cancelling 2 4 arm disks, is used by bifilar vibration absorber Weighted drum supported by three springs is used by a hub vibration absorber. In forc...

Droop compensator is more complex than correlator. Correlator is a mechanical linkage between the collective and the throttle. Two different vibration cancelling 2 4 arm disks, is used by bifilar vibration absorber Weighted drum supported by three springs is used by a hub vibration absorber. In force trim system device returning cyclic to previous position is the gradient spring. If all flight control systems have force trim, there are 4 gradient actuators, 2 for cyclic, and 1 for collective, and one for anti-torque. Servo flap is mounted on the trailing edge, and is 75 percent of the span, to take advantage of the aerodynamic airflow. Advantages of servo flap rotor blade Eliminates hydraulic system, adjustable tracking in flight, infinite life, quiter, reduces vibration, and more reaction for auto rotation. And reduces the amount of force required for pitch change. (makes it pounds of force and not 100 pounds of force) -when doing rigging on a hydraulic assisted helicopter, turn off the hydraulic, make sure all residual hydraulic pressure is bled down, ensure by moving one of the hydraulic assisted controls, it will consume residual pressure. Always rig the collective first, then cyclic, then anti torque. Before connecting the correlator to the collective, ensure that the throttle is rigged. If a helicopter has a fixed elevator it will be an inverted airfoil, directing lift in downwards direction. Elevator provides a more level flight attitude, more comfortable flight. Elevator will move with cyclic forward to maintain a level attitude. Moveable weights on ends of arms is for what vibration system Is the bifilar. Popout float aircrafts cannot take off on water. Ground, hover, then full flight then autorotation test at minimum after completing rigging.overtorque completed after attempting too heavy lift, anything in the drivetrain can be damaged. Overspeed is a concerning situation because it allows uncontrolled amounts of centrifugal force to be generated on the helicopter. You would find a chordwise mass balance weight on the leading edge between 35-55 percent of the span. It is placed by the manufacturer and only repair stations can adjust it. Span wise is located at the tip of the rotor blade. Before and aft of the spanline, are the tracking weights. Adding weights to the forward tracking weight, will make you fly lower in the lane of rotation. Adding weights to aft tracking weight makes the blade fly higher in the plane of rotation. Trim tab is 75 percent of span Bending the trim tab up makes the blade fly higher in the plane of rotation, and bedding lower makes the blade fly lower in the plane of rotation. Irreversible prevents force feedback from controls, and in event of hydraulic failure, will lock fluid in the hydraulic actuator, allowing pilots to have manual control of the hydraulic systems. -symmetrical has better aerodynamic pitching characteristics Get better aerodynamic pitching on asymmetrical by sweeping up trailing edge by 3 degree 2 planforms Uniform, and tapered. Manufacturers prefer uniforms because they can use the same rib and rib part number. Tapered produces more equal lift on its span line because of the converging span span Compensate the equal lift on uniform by twisting it, (look back up for rest of it) Single pocket is cheaper to produce than multi pocket, due to jigging and bonding required for construction. If single pocket is damaged, it will most likely be scrapped. Manufacturers prefer bonded construction with no mechanical fasteners because drilling holes through bond lines with mechanical fasteners weakens the strength of the bond. Special inspection required after autorotation. -hard landing inspection. Most common rotor blade materials Metal, composites, and wood. We might find additional double plates, at the root of the tip, they increase structural strength without increasing blade weight, or additional stiffness to the span of the blade. -Tapered produces lift more equal, because it accounts for the variation of speed. Negative Twist blade to have higher AOA at the root to produce the same amount of lift from the root and the tip, the twist goes from root to tip, higher angle where the for blade is spinning slower (uniform planform)