I've got a lot of hours sitting in the back of rotary aircraft but only 30 mins of flying one. As a low hours fixed wing PPL the flying it straight and level and turns was almost exactly the same even though it works completely differently but my two attempts in the hover were, as expected laughably brief and useless... I couldn't even manage one of the three main flight controls whilst the instructor did the other two, but I think almost every one gets that. Speaking to rotary pilots they say the main issue is the hover which apparently is similar to balancing a pool cue on your finger, really hard till you get the knack for it it then quite easy. But then landing a fixed wing is the only difficult thing about the mechanics of flying (Not the planning and management of safe flying). There is also a state to avoid called ring vortex in the hover which basically means the rotors can't get lift and it can 'really fuck you up' - a technical aviation term.
Lots (most) of skills are the same, navigation, fuel management, weather etc. I think, but someone who knows more about it than me can confirm, most military rotary pilots do about 20/30 hours fixed wing first before transitioning to helicopters
DownwardDog ?. Also there are loads of ex-rotary pilots flying for the airlines.
From memory I think if you have fixed wing PPL you have ten hours less in the minimum requirement for a rotary PPL and vice versa But most people need to minimum time or a not more anyway, And eight of the nine exams are the same so you don't have to redo them.
But at least £450 an hour to learn even in an R22 I don't think I will ever know first hand.
What's the difference between a helicopter pilot and and a helicopter engine? The engine stops whining at the end of the flight.