I've been trying out this problem for hours and cant figure it out. A helicopter is moving horizontally to the right at a constant velocity. The weight of the helicopter is W = 52100 N. The lift force vector L generated by the rotating blade makes an angle of 21.0° with respect to the vertical. Find the magnitude of the Lift force. And find the resultant vector R. http://img237.imageshack.us/img237/9747/0455vd2.gif [Broken] At first i tried doing 52100sin69 for the lift..but that is not the correct answer...STUCK!