Accession Number : AD0867806

Title :   Research on Flight Control Systems. Volume I. The Flow Difference Sensor.

Descriptive Note : Final rept. 16 Aug 68-14 Nov 69,

Corporate Author : HYDRAULIC RESEARCH AND MFG CO VALENCIA CA

Personal Author(s) : Jenney, Gavin D.

Report Date : JAN 1970

Pagination or Media Count : 40

Abstract : Battle damage studies on U.S. aircraft operating in Southeast Asia have pointed out that a significant percentage of aircraft losses have been caused by ground-fire hits on the aircraft hydraulic systems. Isolation devices which shut off the damaged branch of a hydraulic system with a minimum loss of fluid offer a solution to the vulnerability problem. To meet the requirement for a battle damage isolation device for hydraulic systems, the flow difference sensor was designed and developed. The operation of the flow difference sensor is based on the fact that in a correctly operating hydraulic system, return flow is in a fixed ratio to supply flow. Deviation from the correct flow ratio must be a leak. The flow difference sensor uses orifices to measure the return and supply flow and shuts off the pressure line flow when a flow difference above a design detection threshold exists. (Author)

Descriptors :   (*JET FIGHTERS, ANTIAIRCRAFT GUNNERY), (*FLIGHT CONTROL SYSTEMS, VULNERABILITY), (*HYDRAULIC EQUIPMENT, LEAKAGE(FLUID)), DETECTORS, HYDRAULIC FLUIDS, DAMAGE, ORIFICES, FLIGHT TESTING.

Subject Categories : Attack and Fighter Aircraft
      Military Operations, Strategy and Tactics

Distribution Statement : APPROVED FOR PUBLIC RELEASE