@ PEI_3721
... the dominant issues were age, incentive ...
I think they were just finishing up those studies when i was at Cranfield. I seem to recall there was a five pound "prize" for being in the first 50% out of the aircraft. That alone was sufficient incentive to prompt some truly noteworthy enthusiasm to get out the aircraft. I recall being told one particularly keen chap basically took a "superman" dive through the doorway ...