Every helicopter AFM will have a best range Indicated Airspeed / RRPM combo same as does every fixed wing have a best glide speed and propellor setting when the donk stops.
Just learn to go for it automatically first while finding a spot (oh yes you should already have a spot in mind with your mind and eyes in continual, where will I go now mode) and yelling for hellup, otherwise you might miss that - onespot.
Aim to recover by three hundred AGL for the final run in best auto speed /RRPM if possible. Try also to have as long an approach as possible in a straight line so that excess energy is not being used up in turning, which of course will speed up the ROD.
Minimum ROD is life with the collective on the bottom, everything else I believe is second preference.
Last edited by topendtorque; 24th Jul 2012 at 11:41.