The object of this test was to determine the practicability of mounting a 3-inch Davis nonrecoil cannon on an airplane and firing it in the air. The test show that the blast effect or concussion was not harmful to the gunner but seriously inconvenienced the pilot. The gun is easily maneuvered since the wind pressure is balanced. The operation of loading and unloading is not particularly difficult. For use as a bombardment gun this type is much better than the conventional type of cannon, due to the absence of recoil and low weight.