To: ShyTorque
I think Lu is very well aware of the design and reason for bifilars. He is fishing for something.....Eh, Lu?
No, I explained why I wanted the information. I could have expanded on the original question by asking why the damper arms are not disposed at 45-degrees as opposed to how they are disposed at least according to the drawing.
As far as Bifilar dampers and their function I am very familiar with their use on large radial engines. I never worked on a helicopter that used them.
Here is an oddity and I hope I get it right. On the S-58 T they reduced the hydraulic pressure to the two servo systems and at the same time added a Bifilar damper to the head. I had a lot of experience on the S-58 and its' variants and it never had any vibration problems requiring inplane vibration isolation.
Another bit of education. Did you know that Bifilar means double threaded?
