Many Years ago I recall seeing a video of an R22 Mariner in the U.K
The pilot was showing his wife his factory from the air and during the flight he began to suffer carby ice, the result was he began to settle with power and continued to raise the collective until he suffered blade stall.
The video clearly shows the blades slowing and then folding up vertically before the aircraft fell from the sky. both Pilot and Pax dead.
