When I was doing ab-initio instructing for CPL students, I used to demonstrate engine offs in the R22 from downwind 20 feet at around 70-90 knots and doing it like that there's no need for any zoom climb; just lower the lever as you initiate a gentle flare and carry out a 180 degree turn with 30 degrees of bank. You end up doing a fairly gentle engine off, usually to a zero speed touchdown abeam the start point. Naturally this was only demonstrated to students nearing the end of their course.