A model of a helicopter rotor has four blades, each of length 3.90m from the central shaft to the blade tip. The model is rotated in a wind tunnel at a rotational speed of 480rev/min . A.) What is the linear speed of the blade tip? given R= 3.9 T = 480 would it just be V= 2*pi*R/t and got = .05105 someone helped me(not at this forum) and the answer is wrong. can someone help? isnt it just asking for the velocity?