This cane (AR US A Tes Wilni ' J .MO!: AVl.M IHN S'rsiKMS Tl ;,T ACT I VI TV .\KIiS Al k i'liKCl i,.\sr, CAM I'DK.MA l Ci r).' t ■. "i^ietH^ttMAl.. l'.'JII-üfflrt: ■ .rr.K MI i.iciii'iKK incii-Ai.ri iriii: rvAi.i'.vi ic:;, IU.ACKHAI-.'K S-67 HKI.ICOI'TKK _ i ^:>AL iiLi'Liiil j Juii Lhruu^U U July IV/'Z u!,(iK(,i: M. V.-V-IAKAV.'A, i'ri'JL'rl (ifliriT .\1 ;.! KT i.. ' ,•.' 1 .'.!.■, I'rn j LT t LM ■ i iu-r r V.I 1.1,1AM ' ■. liHKTiiX, MA.!, FA, I'S ARMY IT.'Krt I'ih.L HI.V l l C y^ I'SAASTA l'i 'i IKCT \'(). 72-26 (''M I'KO.II iT :JI. 72-J<.
The design of a shore-recording wave amplitude measuring buoy that uses the changing geometry of its stressed but compliant mooring to determine wave heights is presented. Instrumentation is described to measure the angles of inclination and tension of the base end of the compliant mooring cable which supports the wave following buoy. Transducers, amplifiers and voltage-tofrequency converters are installed in pressure housings (at about 150 ft.).The data in the form of analog audio frequency is carried over a 1/2 mile hard wire cable to a shore station where it is converted to digital form and multiplexed on a seven track instrumentation type digital tape recorder. The computer program for data interpretation and wave-spectra results are discussed in a companion paper.
Airspeed calibration tests were conducted on an experimental model of the Elliott low-airspeed system to determine its suitability for use as a helicopter airspeed instrument. The airspeed system was mounted in various locations on the UH-IC helicopter., Emphasis was placed on the low-speed flight regimes where the sensor operated in rotor downwash. Testing was performed by the US Army Aviation Systems Test Acitvity at Edwards Air Force Base, California, between 21 June and 15 November 1971. The evaluation required 13.7 productive test flight hours. The system provides reliable, accurate airspeed data from hover to 120 knots in the direction for which the sensor is mounted, and results indicate an omnidirectional system is feasible. The system is simple, is highly reliable, should be relatively inexpensive in production quantities, and has high potential for development into a standard aircraft instrument. In addition to airspeed information, the system can provide data on downwash velocity, direction, and aircraft performance through measurement of induced flow. Iv r ~UNCLASSIFIED Securi:y Classification !DOCMVAX.T CC.OT. DAT A R t I c ity 455."Ific~tiol ofl itit fh-e cbeft
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.