vrhc.co.ukvrhc.co.uk/heli history/1980/1980-02 - hovering about.pdf · known as...

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Page 1: vrhc.co.ukvrhc.co.uk/Heli History/1980/1980-02 - Hovering about.pdf · known as "whirling" between the bearings and So reduces the required number of bearings. This ' 'whirling",
Page 2: vrhc.co.ukvrhc.co.uk/Heli History/1980/1980-02 - Hovering about.pdf · known as "whirling" between the bearings and So reduces the required number of bearings. This ' 'whirling",