Dave,
Thats interesting. (the coning hinge wear)
To change the subject... Dave I was looking on your website (nice data base)for your list of engineering books... could not find the list. Are there any books that would help with helo mechanical engineering? (detail design of the mast loads etc.)
I am ready to build the mast and transmission assembly but not sure if I will do the design by eyeball engineering or if a more accurate means are available.
I want to build a test stand first like Igor did. No need to design the rotor now, I will do that later.