Robinson R44

[rotors88]

As far as cyclic friction 'in flight' goes in the first instance, refer to the Flight Manual. Secondly if holding the cyclic of a hydraulic powered machine is so tiring then maybe some gym time would elevate the problem. And it aint no aeroplane. I fly 4-6 hours every day in a hydraulic boosted machine with legs up 3hrs if a get bored I sometimes swap hands or fly with my knees. I would never resort to applying friction to the cyclic in flight in the event of the unexpected, or an emergency, I little collective friction applied is different as in does not require the control finesse the cyclic does.