I've said it before, been round the circuit at least twice with the pitot cover still on. I can't recall what the threshold speed is that I use. All down to my instructors beating "attitude" into me. Gliding I remember an old Polish guy who flew with almost no instruments in the panel being asked " how do you know how high you are?" "When my fag goes out it's high enough". Reliance on a bunch of numbers in a light aircraft is a nonsense. What is Vr? FFS.