I would point out gents that most Instructors I flew with were prepared to fly in far more than 12kn. Early in my training on 152 one day wind was some 20kn+ at about 45deg to CL. Instructor was quite happy, flew me for 45mins then stopped the clock on me & did a couple of t&g to keep himself current on crosswinds. It was just that 12kn was what was writ.
Also some of us students were & are well aware of what causes stalls (AofA caused by wt, bankangle, low power+AofA, etc & not really related to speed) I'm trying not to say stall "speed" cos there really isn't one is there? Staggering over trees at TO on a hot summer day with my son in law on board & full tank was anticipated & dealt with, but demonstrated another story.
As an aside, you guys obviously being instructors. I once asked a gliding instructor "How do you calculate lift?" Answer "Half Ro V squared" & he walked away with the look that says "aren't I clever"
OK, pressure 15psi = 7.5 x 60sq (3600)= 27000. 27000 what? pounds, Kg, inches, cubits? My car weighs less than 27000lb so it should fly???