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Why are helicopter blades straight?
A helicopter’s rotors allow it to do things an airplane cannot. Unlike an airplane, a helicopter does not have to move quickly through the air to have lift. That fact means it can move straight up or down.
Why do helicopters look weird on camera?
Long exposures make the helicopter blades look blurry, while faster shutter speeds will create everything from normal-looking patterns to the appearance of individual blades. Frame rate-per-second (FPS) also affects the way images appear on film and video.
Why do airplane propellers look weird on camera?
Normally, the effect of this rolling shutter is unnoticeable, but when you’re taking a picture of something that’s moving as fast as a propeller, that lag time becomes noticeable and manifests as surreal distortion. A longer shutter speed or a camera with a more expensive charge-couple device (CCD) sensor.
Do plane propellers Bend?
A: A propeller is a spinning wing. Torque bending force, in the form of air resistance, tends to bend the propeller blades in the direction opposite that of rotation. A Propeller “Lifts” an Airplane Forward Like a wing, it produces lift, but in a forward direction—a force we refer to as thrust.
Why do you need so many blades on a helicopter?
The blades, like wings, affect air to a significant distance above and below them, so you don’t need many blades to use all air within the rotor area. But no matter how many blades you add, they will still only affect the air within the rotor area, so the efficiency won’t change much.
Why are longer rotors better for a helicopter?
My understanding of helicopters is that, despite theoretically increasing efficiency, longer blades are worse in practice than short ones in every respect (except, perhaps, cost): Longer blades are more prone to vibration and resonance dynamics, if for no reason other than that their rigidity is reduced by length, holding all else constant.
Why are long blades bad for an airplane?
Longer blades provide less operating clearance. Longer blades not only stall before shorter blades (retreating), but also hit the Critical Mach number at lower air speeds (advancing).
Why are longer blades better for aerodynamics than shorter?
Longer blades not only stall before shorter blades (retreating), but also hit the Critical Mach number at lower air speeds (advancing). Fewer blades require higher rotational speeds for a given “rotor disk” area, which is inefficient from not only an aerodynamics perspective but also, presumably, a transmission-and-control perspective.