Variable pitch propellers

[Ceppo]

Hi all. I would like to ask one of you clever cookies out there whether you can explain the mechanisms of a variable pitch propeller. I.e. how do they have the pitch vary whilst the thing is spinning. (I don't mean the aerodynamics behind it, just the mechanism) If it's an electrical motor which does the pushing and pulling (so to speak) how can something stationary i.e. the motor move something that is spinning? i.e. the prop

Thanks


oh and while i'm here, to stop me from having to start up another thread. On average, how many take offs and landings do short haul and long haul pilots make each day/week/month.

Thanks a lot