Got an A65-powered Taylorcraft up to 10,000 ft (11,200 when I switched to 1013), just to see the number on the altimeter. Took me about 20 minutes to get back down for fear of shock-cooling the engine. It was mighty cold up there, if I remember correctly.
Had the Pitts up that high over Norfolk one time, too. Amazing cloud formations on that day, which was what got me to climb that high on that day.
I have to admit I felt a bit uncomfortable being that far away from the ground, as daft as that sounds.
Well done!
Pitts2112