The A-10 Warthog is built around a 30 mm cannon that fires depleted uranium rounds, 65 of them per second.
I heard from someone who worked on the flight controls a long time ago, that when the cannon is fired it provides more thrust than the engines. Is this true? What are the effects of this?
The original question was answered by @Gypaets: thrust of the cannon is comparable to thrust of one engine. The wikipedia article on the GAU-8 cannon mentions that effects of thrust of the cannon are well accounted for by placing the firing barrel at the centre line of the air frame. Ron Gordon's answer reveals some interesting side effects from spooling the cannon up and down when operating - the aircraft bucks. It's a big cannon.