Reconsider the helicopter in Prob. 6–36, except that it is
Chapter 6, Problem 34P(choose chapter or problem)
Problem 34P
Reconsider the helicopter in Prob. 6–36, except that it is hovering on top of a 2800-m-high mountain where the air density is 0.928 kg/m3. Noting that the unloaded helicopter blades must rotate at 400 rpm to hover at sea level, determine the blade rotational velocity to hover at the higher altitude. Also determine the percent increase in the required power input to hover at 3000-m altitude relative to that at sea level. Answers: 451 rpm, 13 percent
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