Accession Number : AD0907180

Title :   Flutter Analysis and Recommended Testing of the F-4/C/D/E Aircraft Carrying Mk 84 or Mk 82 Bombs on the Outboard Wing Stations.

Descriptive Note : Final rept. Jun-Aug 72,

Corporate Author : MCDONNELL AIRCRAFT CO ST LOUIS MO

Personal Author(s) : Johnson, C. E. ; Smith, J. R.

Report Date : SEP 1972

Pagination or Media Count : 126

Abstract : Flutter analysis of the F-4C/D/E wing were conducted for two types of low-drag general purpose bombs mounted on the outboard wing pylons to investigate possible carriage to 650 knots equivalent airspeed or M - 1.4, whichever is less. The bombs analyzed were the MK84 suspended directly from the pylon and the MK82 installed on the multiple ejector rack (MER). Analytical wing flutter stability trends were investigated for a number of parameters for carriage of the two bomb types. The investigation included evaluation of effects on wing flutter of aircraft internal fuel, tolerance variations in bomb inertia characteristics, flight altitude, and Mach number for symmetric and antisymmetric modes. Studies were made of MK82 bomb loading configurations resulting from the normal bomb release sequence from a fully loaded MER and from hung bombs, which occasionally occur on the MER shoulder positions. Basic data which were utilized in these analyses are included in this report. Results of the flutter analyses indicate that the MK84 bomb, the fully loaded MER with six MK82 bombs, and all but three of the MK82 bomb partially loaded configurations can be cleared for carriage to 650 knots equivalent airspeed or M = 1.4, whichever is less. For these three MK82 bomb loading configurations, flight testing is recommended to establish if adequate damping and/or velocity margins exist for the potentially critical modes throughout the flight envelope goal. (Author)

Descriptors :   (*FLUTTER, JET FIGHTERS), (*SWEPTBACK WINGS, GENERAL PURPOSE BOMBS), EXTERNAL STORES, BOMB RACKS, MATHEMATICAL ANALYSIS, TEST METHODS, VELOCITY, DAMPING, AIRSPEED, VIBRATION, STABILITY, LOADS(FORCES), ALTITUDE, INERTIA, FREQUENCY, WEIGHT, AERODYNAMIC CHARACTERISTICS, MATHEMATICAL MODELS, MACH NUMBER.

Subject Categories : Attack and Fighter Aircraft
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE