Accession Number : AD0473192


Title :   INVESTIGATION OF A-4 SIGHT IN F-86E AIRPLANE


Corporate Author : NORTH AMERICAN AVIATION INC LOS ANGELES CA


Personal Author(s) : Holton, E C ; D'Amico, J A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/473192.pdf


Report Date : 18 Jul 1952


Pagination or Media Count : 41


Abstract : A previous report concluded that the major cause of reticle vibration was excessive free play, mirror unbalance and lack of inherent system stiffness. The rework accomplished by the sight manufacturers was effective in reducing high frequency reticle vibration. The predominant range of vibration was 3 - 5 mils in azimuth and in elevation, with a peak of approximately 6 - 8 mils in both azimuth and elevation. Low frequency reticle oscillation occurred during air and ground firing tests. An A-4 adapter assembly, incorporating a removable combining glass, was devised to eliminate removal of the sight head for the purpose of cleaning the aft face of the windshield and the forward face of the combining glass. This configuration was mounted in the F-86E airplane, in conjunction with an N-9 sight, and subjected to gun fire vibrations. In azimuth, the predominant range of reticle vibration was 1 - 2 mils with a peak of 2 - 3 mils. In elevation, the predominant range was 1 - 2 mils with a peak of 3 - 4 mils. The removable combining glass was also checked for retention of boresight position. The thumb screws which retain the combining glass in the adapter were tightened in various sequences to determine the best procedure to follow. It has been found that if the thumb screws are tightened simultaneously, or reasonably so, the maximum variation from the original boresighted position is approximately 1/2 mil.


Descriptors :   *JET FIGHTERS , *OPTICAL SIGHTS , MIRRORS , FLIGHT TESTING , VIBRATION , EXPERIMENTAL DATA , PERFORMANCE(ENGINEERING) , FIRING TESTS(ORDNANCE) , DEFLECTION , RESONANCE , BORESIGHTING , ADAPTERS , OSCILLATION , PHOTOGRAPHS , AERIAL GUNNERY , RETICLES , MODIFICATION KITS


Subject Categories : Optical Detection and Detectors
      Fire Control and Bombing Systems


Distribution Statement : APPROVED FOR PUBLIC RELEASE