Rolling take offs in a Helicopter
I understand that in limiting conditions of density altitude / heavy weight a helicopter can use a rolling take off rather than a vertical one
My question is how this works, particularly in reference to control inputs
Do you start the roll with a little forward cyclic and full up collective, lifting into the air when enough lift has been achieved or start with a little forward cyclic, full down collective and slowly bring the collective up as you gain speed and lift off ?
Additional questions, will you have achieved translational lift before lifting off ? Is this necessary?
Do helicopter manufacturers endorse and or certify their aircraft for this generally and do they provide recommended flight manual techniques ?
Do I have this correct in when you might use this type of take off ?
Finally would you ever perform a run on landing for similar reasons ?
Fixed wing pilot here, trying to understand this ( rare ?) aspect of helicopter flying