Helicopters, cars etc.... right hand drive, it's the only way.
Look at the fast jet jockeys their little beasts are all laid out for right hand on the stick and left hand on the throttle where they should be.
The moral is: all half way decent vehicles HAVE to be right hand drive. Anything else is heracy.
But even more seriously, it's all about ergonomics. Left hand drive helicopters are simpy a pain, try changing frequency from tower to ground just as they put you in a hover on a hot day with a load of pax with only one radio with no pre-select and you will know why!