Why are helicopters are so noisy???
2 answers:
Answer:
The res earchers ex plained that most of the noise is g enerated by the h elic opter's main rotor. When the rotor spins, a ir pres sure
d ecr eases a bove it and increases below it. This is what causes the helicopter to ri se. A ir flows around the blade to even out the
pre ssure dif ference and cre ates a concentrated vor tex.
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