840 Propellor
840 Propellor. Pilot-Valve. Flyweights. Speeder Spring. Basic Prop Control ON-Speed. Pilot Valve Blocks Oil, Ports Prop to Gear-case. Basic Prop Control OVER-Speed. Pilot Valve Blocks Oil Dump, Ports Oil to Prop. Note Port in Beta Tube. Basic Prop Control UNDER-Speed.
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