I asked this a few pages back but didn't get an answer - what would happen if in a critical situation, already too low and with no engine power, the pilot had to clear a tall building directly in front of him?
I looked at the crash site again today from a distance, and if the witness at Glasgow Cross who saw the helicopter flying unusually low and apparently only just above the Osborne St railway viaduct (accepting that this may have been a line-of-sight error with it further away and slightly higher, but even if this is true) is correct, it would have only just cleared the glass-roofed building immediately to the east of the Clutha. This building looks to be about 35 feet high.
Could trying to gain even a tiny bit of height to clear the top of this building cause a rotor stall? If so, would the impact point be about the same distance beyond the building, give or take a bit?
See
for a typical light helicopter flight path in autorotation and flare for touchdown. If you're in autorotation and at or below the height of an obstacle in front of you, the only option is to dodge it.