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Mark _australia said..
Geez, even real planes have limits on how long they can fire a full auto cannon for as it slows airspeed drastically,.
Works the other way too....
WW2 British Coastal Command aircrews flying AVRO Ansons were woefully under-gunned, with only 1 x fixed .303 machine gun in a wing, 1 x .303 Vickers drum fed machine gun in the mid turret.
They were up against Messerschmitt's with multiple machine guns and cannon.
The Anson crews "borrowed" a heap of weaponry from a ship that ran aground near their base.
Before long they were bristling with assorted belt fed goodness - and poking out the bottom of the fuselage was a rearward facing magazine fed 20mm cannon
Firing off the mag. gained them another 5 knots or so - and scared the bejeezus out of the pursuing jerry pilots
As for recoilless weaponry - how about strapping something like these under a drone?
recoil-less "Davy Crockett"
75mm recoil-less rifle mounted on a [French] paratroopers Vespa
stephen