Aircraft can do loops and depending on how much energy and or power and or altitude you have on hand you can do multiple loops one after the other as long as your angle of attack does not exceed the stall angle. (ie you still have to fly the aircraft within it's flight envelope)
I expect this would effect the 'going vertical' manuvers where the pilot just yanks back on the stick and expects all their aircrafts energy to be converted to height or violent break turns.
I found (what i thought) reasonable description of a dynamic stall at
http://psasir.upm.edu.my/3610/1/An_E..._Inception.pdf
Quote:
When an aerofoil is pitched through and beyond the incidence of static stall at a
sufficiently high pitch rate, the resulting series of events is often termed dynamic stall.
It is characterised by a significant lift overshoot, followed by a sudden loss of lift and a
major surge in pitching moment. Carr, (1977),
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Interesting reading.
cheers!