To: helmet fire.
I can only assume that Nick read the two textbooks I alluded to and that he would have to agree. The statements may not be word for word but they get the meaning across.
I did note the Blackhawk has more than four blades but I would find it difficult to describe the relative positions of the blades and compare these positions to some known quantity such as a peace sign.
Looking down on a four bladed helicopter in flight the advancing blade would be ahead of the lateral axis and the retreating blade would also be ahead of the lateral axis the other blades would be aligned with the longitudinal axis forming a peace sign.
