Lots of interesting responses...prob Nick Lappos would have a REAL answer...I personally think that is is just a convenient convention so as to allow the Captain of the A/C the ability to keep his hand on the cyclic at all times. As for the CHC rescue S76 in Oz the commander of the 'rescue' sits in the LH seat because the A/C command pilot is (still) sitting in the RHS seat. The Hu500 civillian version certainly seats the pilot on the LHS...however the OH6 (loach) seated the driver on the RHS... in the end I guess it really depend on the engineers who get the suckers certified! .....may the conjecture contine ...