# "THE De HAVILLAND HYDROMATIC AIRSCREW / INSTALLATION" WWII AIRCRAFT PROPELLER FILM 75764

This Royal Air Force ground crew educational film "The DeHavilland Hydromatic Airscrew" describes the installation of that propeller, which entered production in the late 1930s and was used during WWII on many different aicraft. The Hydromatic Air Screw consists of three main assemblies: the barrel and blade assembly, the distributor valve housing with its oil conductor sleeve, and the dome assembly, which are carefully installed in sequence. The constant speed unit is mounted behind the air screw and driven by a quill shaft, with a special gasket ensuring a secure joint. During assembly, precise alignment and proper lubrication of components, including splines and oil seals, are crucial. The air screw nut is tightened to a specific torque, and the distributor valve housing is secured with a left-hand thread and locking wire to prevent loosening. Before mounting the dome, the blades are feathered using a torque bar, and the dome assembly is carefully aligned and fastened. After installation, engine runs are conducted to check and adjust the air screw operation, including filling the dome with oil, verifying blade movement across pitch settings, and ensuring RPM limits are met using the constant speed governor. Feathering and unfeathering procedures are tested to confirm proper functionality, with attention to oil pressure effects that may cause occasional unfathering after operation. The reliability of the system depends heavily on skilled craftsmanship during both…

- Kind: Film
- Genres: War, Industrial and advertising
- Archive: [Internet Archive](https://archive.org/details/75764TheHydromaticAirscrew)
- Licence or status: none stated by the archive
- Who can watch: Teens profiles and older (the archive gives no rating; placed by Invisible Network from its collection and subjects)

[Watch now](https://invisiblenetwork.ai/watch/archive/ia/75764TheHydromaticAirscrew?play=1)