SWASH PLATES VIBRATIONS

anach05 - please do not use upper-case throughout - this is the 'web' equivalent of shouting.

Here are some things you should have read before posting (they were on your screen):

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Question is oversimplistic...there could be virtually uncountably many was to make the measurement. That is why (for copter developers) it's a design and test problem, not a fixed formula. Your question needs to fit inside of some envelope, so to speak.