The probe issue was pretty much settled for me when Bob observed that
the fuselage probe works better in practice than in theory. Thanks
for the advice.

I'm curious about the "sport canopy". Do you refer to flying with the
canopy removed? Is this something people talk about? I saw some
video of guys parachuting from a Blanik from which the canopy was
removed. It looked cool for the summer. I've flown with the canopy
of a 2-33 opened and enjoyed the breeze. Will a B4 explode if you fly
it with the canopy removed?