The then Hughes demo party trick was ~120 knots at about 6 ft. Roll the throttle, zoom climb as described here previously, roll left when down to about 60 knots, haul it around in a descending turn and flare to touch down back where you started!!
Wow, 6' huh. I believe it.
I have done these form 120knots about 200' (180 touchdown autos back to the spot where the throttle was chopped, liked others said, you can get a 500' climb for almost 10 seconds, climb up to 350 or so' while doing a 180' turn. As Hughes 500 said, you leave the collective where its at until you get to the desired airspeed. A good 5-7 seconds If I remember correctly.