Accession Number : AD0668171

Title :   MOTIONS OF A FLOAT-SUPPORTED AIRCRAFT IN A SEAWAY.

Descriptive Note : Technical rept.,

Corporate Author : HYDRONAUTICS INC LAUREL MD

Personal Author(s) : Barr,R. A. ; Altmann,R. R. ; Wong,K. K.

Report Date : SEP 1967

Pagination or Media Count : 122

Abstract : An experimental investigation of three vertical float configurations was carried out and the results compared with theoretical predictions of the motions. The models considered correspond to: The A2 aircraft configuration considered by Wong in head seas; the A2 configuration in beam seas; and a configuration identical with the A2 configuration in beam seas but having tapered or flared floats. It was thus possible to compare the response for three configurations each having significantly different responses. Calculations of the heave, pitch (roll) and surge (sway) response were made using the non-linear methods developed by Barr and Martin. The measured heave and surge response are found to be in fairly good agreement with the theoretical predictions. The measured and predicted pitch (roll) responses are not in good agreement, although fair agreement was obtained for head seas by a modification of the estimated plate drag coefficient. For both roll and heave, the measured response was greater with tapered than with cylindrical floats. Further experimental investigation of float and damping plate forces and non-linear effects are needed to obtain improved predictions of response, particularly for pitch (roll). (Author)

Descriptors :   (*SEAPLANES, SEAPLANE FLOATS), (*SEAPLANE FLOATS, HYDRODYNAMICS), EQUATIONS OF MOTION, OCEAN WAVES, MODEL TESTS, HYDRODYNAMIC CONFIGURATIONS, CYLINDRICAL BODIES, TAPER, RESPONSE, FORCE(MECHANICS), BUOYANCY, SCALE, PITCH(MOTION), ROLL

Subject Categories : Aircraft
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE