By mid 1915, the introduction of the trusted gun synchronizer from the Imperial German Flying Corps manufactured it achievable to fire a shut-bolt machine gun ahead via a spinning propeller by timing the firing of the gun to skip the blades. The Allies had no equivalent system till 1916 https://machinegunadventure47912.actoblog.com/38942378/5-simple-statements-about-sig-spear-lt-explained