By mid 1915, the introduction of the reliable gun synchronizer from the Imperial German Flying Corps built it possible to fireside a closed-bolt machine gun ahead via a spinning propeller by timing the firing of the gun to miss the blades. The Allies experienced no equivalent system till 1916 https://elliotuogsb.dm-blog.com/35811494/the-smart-trick-of-machine-gun-that-nobody-is-discussing