- #1
nautica
a) calculate the centipetal acc at the tip of a 4.00 m long helicopter blade that rotates at 300 rpm.
300 rpm = 31.42 rad/s = w
Centrip Acc = rw^2
Ac = (3.41 rad/s)^2 * 4 m
Ac = 3948.87 m/s^2
b)compare linear speed of the tip with the speed of sound which is 340 m/s
v=rw
v = 4m * (31.42 rad/sec) = 125.28 m/s
So the blades are slower than the speed of sound.
This does not sound right to me I figured the blades would be faster - but maybe just not at the tip?
Thanks
Nautica
300 rpm = 31.42 rad/s = w
Centrip Acc = rw^2
Ac = (3.41 rad/s)^2 * 4 m
Ac = 3948.87 m/s^2
b)compare linear speed of the tip with the speed of sound which is 340 m/s
v=rw
v = 4m * (31.42 rad/sec) = 125.28 m/s
So the blades are slower than the speed of sound.
This does not sound right to me I figured the blades would be faster - but maybe just not at the tip?
Thanks
Nautica