Accession Number : AD0818980

Title :   PILOT STUDY OF RESPONSE OF CV-2 AIRCRAFT TO IRREGULAR TERRAIN.

Descriptive Note : Final rept. Sep-Oct 65,

Corporate Author : ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS

Personal Author(s) : Green, Andrew J., Jr. ; Rush, Edgar S.

Report Date : JUL 1967

Pagination or Media Count : 108

Abstract : The investigation reported herein was a pilot study undertaken to develop means of predicting the performance of a CV-2 aircraft on irregular terrain and of quantifying surface roughness. Special tests were conducted to ascertain the natural frequency and damping characteristics in both the vertical and horizontal directions of the elements of the aircraft. Landing, takeoff, and taxi tests were conducted at 15 field sites in three general areas; accelerometers and strain gages were used to record responses of 12 critical components of the aircraft. Simple mathematical models to predict the dynamic responses of certain of the aircraft components were developed for solution by both analog and digital computers and were verified by comparison with measured data. Because of certain assumptions used in the development of the models, the predicted data did not agree exactly with the actual data. Although the predictions were of useful accuracy, it is recommended that an analog model, excited by measured terrain data, be used to determine the adequacy of a surface for landings of the CV-2 aircraft. To obtain the terrain input, an outrigger trailer dynamometer with an actual prototype aircraft tire as the terrain follower is proposed. (Author)

Descriptors :   *LANDING FIELDS), (*SHORT TAKEOFF AIRCRAFT, CANADA, TERRAIN, SURFACE ROUGHNESS, TAKEOFF, AIRCRAFT LANDINGS, TAXIING, MATHEMATICAL PREDICTION, COMPUTER PROGRAMS, MATHEMATICAL MODELS, FLIGHT TESTING, LANDING GEAR, RESPONSE(BIOLOGY), ARMY AIRCRAFT.

Subject Categories : V/STOL
      Terminal Flight Facilities

Distribution Statement : APPROVED FOR PUBLIC RELEASE