The original 12,000 meter record setting ran out of fuel on purpose, as the highest altitude would be achieved at the lowest weight, and you can't get much lower in weight!
TangoMikeYankee,
The effort that you mention, whhich is clearly marked on that photo is not listed by the FAI. The word "record" is normally applied to those that are homologated by the Federation Aeronautique Internationale by use of their experts and instruments. Otherwise, the records could become food fights among parties with few standards. I wonder why that climb is not mentioned. Could be that the flight was not sanctioned by the FAI.
For some of those other records requested by Thomas Coupling, we will have to wing it because the FAI doesn't recognize the classifications. For unofficial sideward and rearward, let me toss my hat in the ring, the S-76B Fantail demonstrator went 85 knots backwards and 89 knots sidewards during our trials.
The heaviest helicopter ever was the Mi-12 or V-12, which carried a payload of 40,000 Kg, and must have weigheed about 80,000 kg MGW for that record. The Mi-26 is 56,000 kg, and the CH-53E is about 33,500 Kg.
I ran the Sikorsky S-76 record trials back in 1982, and got to watch the process in action, it is interesting!