Abstract

Abstract : A comparison is presented between the efficiency and weight of the UH-1 helicopter gear transmission and speed reducer systems to a hydraulic power transmitting system for the UH-1. The hydraulic transmission system is composed of a 'turbine speed' hydraulic pump and a hydraulic motor. The hydraulic transmission system utilizes recently developed non-Newtonian, viscoelastic fluids which greatly reduce fluid friction losses, increase hydraulic component volumetric efficiency, and allows a substantial reduction in connecting fluid line sizes without the usual high fluid friction losses which normally result from use of small lines. The results of the comparison show the hydraulic transmission system efficiency closely matches the gear system efficiency, and the hydraulic transmission system is lighter than the gear system. A limited aircraft effectiveness study shows that the flexibility of design which is possible with a hydraulic transmission can result in an increase in useful engine horsepower, reduced infrared signature, improved foreign object damage protection and a reduction in engine/airframe vibration. The hydraulic transmission system is based upon hydraulic components which were chosen from an industry and government agency wide search for the best hydraulic components. Design data and calculated and test performance are shown for the hydraulic components. Test data is shown for the fluid flow friction reducing hydraulic fluid. Vulnerability, maintenance, logistics and operational considerations for a hydraulic transmission are presented.

Talk to us

Join us for a 30 min session where you can share your feedback and ask us any queries you have

Schedule a call

Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.