In article , Peter Duniho
writes

Well, regardless of the conversion, a 850 pound recoil thrust would
certainly hurt your airspeed. Hard to say exactly how much, since it would
depend on how long that 850 pounds of thrust was acting on the airframe.

Seems to me that there's a pretty good chance the force would just tear the
gun from the airframe, or break the airframe. Assuming a structure strong
enough to withstand it, you might find you can't take off with your 160hp
engine.

What is needed to assess that effect better is
1. The mass of each shell
2. The muzzle velocity
3. Rate of fire
4. Time for shell to accelerate down the barrel and/or effective
muzzle length.

Rapid but short applications of force might shake the airframe violently
rather than stop it in mid air. 3000 ft/sec in 5 ft might only take less
than .007 secs.

As long as the weapon is rigidly fixed to the airframe it is the
momentum change that the airframe feels in terms of velocity.
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