Recoil[edit]
Because the gun's recoil forces could push the entire plane off target during firing, the weapon itself is mounted laterally off-center, slightly to the port side of the fuselage centerline, with the actively "firing" barrel in the nine o'clock position (when viewed from the front of the aircraft), so that the firing barrel lies directly on the aircraft's centerline. The firing barrel also lies just below the aircraft's center of gravity, being bore-sighted along a line 2 degrees below the aircraft's line of flight. This arrangement accurately centers the recoil forces, preventing changes in aircraft
pitch or
yaw when fired. This configuration also leaves space for the front landing gear, which is mounted slightly off-center on the starboard side of the nose.
[19]
The GAU-8/A utilizes recoil adapters. They are the interface between the gun housing and the gun mount. By absorbing (in compression) the recoil forces, they spread the time of the recoil impulse and counter recoil energy transmitted to the supporting structure when the gun is fired.
The A-10 engines were initially susceptible to
flameout when subjected to gases generated in the firing of the gun. When the GAU-8 is being fired, the smoke from the gun can make the engines stop, and this did occur during initial flight testing.
[2] Gun exhaust is essentially oxygen-free, and is certainly capable of causing flameouts of
gas turbines. The A-10 engines now have a self-sustaining combustion section. When the gun is fired the igniters come on to reduce the possibility of a flameout.
[20]
The average recoil force of the GAU-8/A is 10,000
pounds-force (45 kN),
[3][21] which is slightly more than the output of each of the A-10's two
TF34 engines of 9,065 lbf (40.3 kN).
[22] While this recoil force is significant, in practice a cannon fire burst slows the aircraft only a few miles per hour in level flight.
[
If I were to mount this gun on my car facing backwards,
put the car in neutral and hit the trigger, my car would break
the interstate speed limit in less than 3 seconds.
