I mentioned in my December acknowledgement of SP's efforts that he is pretty much 'flying solo' in terms of overall responsibility for Rotorheads since the departure of Heliport - and there are several forums with a single moderator so this is no exception.
However, my understanding is that moderators from other forums overlap their efforts, most especially when the principal forum moderator is offline.
By contrast, the Rumours & News Forum has no advertised moderator!