I am most grateful for the answers offered to my question ,
LU your answer re the lag and this being taken up in the hinge or flapping mechanism does that mean the rotor blade is always rigidly straight at its leading edge( which in theory should be the strongest part) upon advancment and retreating, or could there be any minute bending ie, rotor tip slightly beind on advance but straightening on retreat, if this is the case the flexing and bending of the rotor leading edge would be the same as bending a spoon backwards and forwards until somthing breaks because of the weakening of the grain structure of the leading edge, now if you take the metal used in most leading edges it is normally die drawn or mould pressed, if it is die drawn then the grain is running laterally from Rotor hub tho blade tip this in theory is the weakest form of granular structure for 90dg stress at he leading edge, I know this must sound like a lost cause but has any research been carried out but blade manufacturers to look at this sort of stress. again I must than all for good answers and ask you guys out there for more help.
My Regards
Peter R-B