Quote:

starting at 270 degrees the linear force would be
very small , then at 180 degrees the linear force would
be very large then at 90 degrees the linear force would be very small again.


You can quantify "very small" using trig as in this picture. I might have measured my angles from a different direction to you but it doesn't really matter.


Oh, what I call "longitudinal" I think is what you call "linear". The component of the force parallel to the direction the pipe moves.

Last edited by kallog; 07/10/10 03:04 PM.