technical question R22/R44

[mecheli]

I've noticed that the tailrotors on the R22 and the R44 turn opposite to each other (the R44 being the 'conventional' way?)

Anyhow; what’s the reason, they appear very similar to each other in other aspects with the size being the difference.

Is there any aerodynamical advantage in having the tailrotor spinning clock/anti-clockwise?

Can anyone enlighten me?

// mecheli