🤓 In the 1915 air war the Allies didn't yet have their own version of the mechanical interruptor gear, which fueled the Fokker scourge. Early allied planes used metal deflectors on their props, though the Airco DH2 solved the problem being driven by a push prop behind the pilot and the guns.

Synchronization of the guns was solved by the deployment of the Nieuport 17 and Airco DH5, both biplanes that brought an end to the Eindekker scourge. /🤓

PS: You are right, that the mechanical synchronizers weren't perfect, and there was like some periods of both used on the same plane. Eventually, props were made that spun at consistent rates and the synchronizer was electric and worked very well.