Guppy had amazing depth of knowledge.
ISTR there were suspicions that all his knowledge and (assumed) wisdom had been plucked from casual talk, probably on the internet, and little if any came from actual flying. Indeed the amount and quality of flying experience he reported here seemed incongruent with the, err, shall I say "enthusiast" style of writing that is usually associated with tenderer age.
I can remember being picked apart by him in one thread in a ruthless manner! After that I was always very wary of the accuracy of what I posted
Well, sorry to play the old schoolmaster, but it shouldn't require a person banned for whatever reason to teach us to post accurately.