Back in my blanket stacking days in, I think it was 1965 or 1966, I was in the left hand seat of our trusty Bedford 3 Tonner heading down the tree-lined road from AMQ's towards the RAF Ternhill entrance when a rotor blade sailed through the tree tops above us. As we approached the main road the remains of the Sycamore had settled into the corner of the airfield in front of us and both aircrew were doing their best efforts at a sprint upwind. I can only assume that they were attempting a "confined area" landing or had a blade strike on a nearby tree but I would guess it was the dreaded ground resonance. Anyway it didn't put me off applying for SAR a few years later but then things had moved on to the Whirlwind.