be shure your comments are useful
i calculated the centrifugal force with a blade weight of 4 kg and a tip speed of 900 kmh, i found a result about 8 tons, i will take 10-12 tons as data.
yes there are a lot of harmonics, and i have no skills to study them, so i try to damp where i can, i actually study elastomeric dampers and alot have a very low frequency.. should be ok for lag damping.. for the blades, i plan to place the weights in an odd place (not the middle for example) to "cut" the inner resonnance freq
about ground resonance, the ideal should be rigid skids or fully dampened wheels,
i actually focus on rotor, i will show the airframe soon,
solidworks allows me to perform simulations, the blade should be ok, the blade holder also (the rod is 2 cm diameter), my concern is about the cissors effect on the nuts..
i agree with you the ball (3 cm diam) may be weak, and honestly i miss some data on this point.
the plates you see are titanium ( i checked the prices, i can have a sheet of 3 mm thickness for about 40 $) between them is a core of elastomer (the air ducts made of reinforced air hoses are drowned in it)
dont worry, i dont discourage, i m sketching paper foor about 10 years, stopped, continued.. now i ll go until i succeed ot loose
just go on, throw the stones
i ll try to catch them
thanks