Two helicopter reports:
G-RFUN: R44
"The helicopter took off at close to its maximum weight. It then flew to a hilly area, where the pilot made a downwind approach, with full carburettor heat applied, to an Out-of-Ground-Effect (OGE) hover. The manufacturer’s performance figures show this to be outside the declared flight envelope of the helicopter. The helicopter was unable to sustain the hover and descended, probably entering a vortex ring state, before it landed heavily and rolled onto its side. The occupants escaped from the aircraft with one passenger sustaining a minor injury."
G-SAIG and a Spitfire
"The Robinson R44 helicopter hover taxied across Runway 28 as the Spitfire was completing its landing roll. The propeller of the Spitfire contacted the empennage of the helicopter but neither pilot was aware there had been contact, although a bump was felt in the R44. The helicopter returned to the apron for an inspection, where damage to its empennage and tail rotor guard was discovered"