CS,
I agree with you reference the long run-on distance after the deceleration high pitch attitude. Nick can probably offer a more articulate answer; however, the answer to stopping or significantly reducing the ground run distance at touch down is to perform the autorotation similar to the way the US Coast Guard used to teach the manuever for the H-52 (S-62 civilian version).
The coast Guard had a full instrument package and radio altimeter, which were all necessary to properly perform the maneuver. The decelration would start at 200 feet AGL, as the airspeed decreased below 50 knots, the nose was leveled with the horizon. By this point the aircraft was somewhere around 50 feet off the water, The pilot had to control rotor rpm by reducing collective as the nose was being leveled. At an appropriate point above the ground (as I vaguely recall 20 to 25 feet) the rest of the collective pitch was positively nicreased to allow the aircraft to settle in the water without forward airspeed.
We used to do the same manuever with our S-62s in the GOM, but wuithout SAS or radar altimters. The maneuver is a cheap thrill on the first try, but it works. We modified the maneuver to reflect more of a profile like the US Army would perform with the UH-1H (B205). Deceleration somwhere around 75 feet, hold to 30 feet, take out most of the decelration attitude and tounchdown in the water with an approximate2 degree pitch up attitude. Same result and still floating.
Army pilots rule!
Nick,
Any suggestions on an autorotation profile to the water to minimize forard movement on landing?