Accession Number : AD0462744


Title :   JOINT ARMY-NAVY AIRCRAFT INSTRUMENTATION RESEARCH (JANAIR) ROTOR BLADE RADAR ANTENNA - PHASE 2


Descriptive Note : Final interim rept.


Corporate Author : BELL HELICOPTER TEXTRON INC FORT WORTH TX


Personal Author(s) : Palmer, James E ; Young, David W


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/462744.pdf


Report Date : Feb 1965


Pagination or Media Count : 78


Abstract : This report covers a research project to investigate the feasibility of using the main rotor blade of a helicopter as a high resolution radar antenna. Fifteen-inch antenna sections were built and tested to study detailed leading and trailing edge array element environments. A full length, 173-in. array was built and tested. A jig was constructed to accept the full length array, and radiation pattern measurements made of beamwidth, focus, sidelobe levels, and front-to-back ratios. Beamwidth and aidelobes were measured under deflections simulating maximum flight loads. Photographs of thin radar sector slices emphasizing elevation and azimuth obstacle sensing capabilities taken from a modified PPI were compared with optical photographs. The array was then installed, covered with an erosion boot and tested in the leading edge of a used UH-1B rotor blade.


Descriptors :   *HELICOPTER ROTORS , *RADAR ANTENNAS , *ROTOR BLADES(ROTARY WINGS) , AERODYNAMIC LOADING , ANTENNA LOBES , ANTENNA RADIATION PATTERNS , AZIMUTH , CONTROL SYSTEMS , DEFLECTION , DISTRIBUTION , ELECTRONIC SWITCHES , FOCUSING , JIGS , MEASUREMENT , PHASE SHIFT CIRCUITS , PLAN POSITION INDICATORS , RADIOFREQUENCY POWER , RELAXATION OSCILLATORS , SLOT ANTENNAS , TRIGGER CIRCUITS , VIDEO AMPLIFIERS , WAVEGUIDES


Subject Categories : Helicopters
      Active & Passive Radar Detection & Equipment


Distribution Statement : APPROVED FOR PUBLIC RELEASE