Accession Number : ADA255071


Title :   Evaluation of Alternatives for Increasing A-7D Rearward Visibility


Descriptive Note : Interim rept. Aug 1988-May 1990


Corporate Author : DAYTON UNIV OH RESEARCH INST


Personal Author(s) : Frank, G J ; Stenger, G J


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a255071.pdf


Report Date : Apr 1992


Pagination or Media Count : 172


Abstract : Experience has shown that the present A-7D canopy provides poor rearward visibility for defensive maneuvering against an adversary behind the A- 7. Alternatives were identified and evaluated for increasing rearward visibility, including: increasing the length of the canopy transparency; adding external mirrors; modifying the existing internal mirrors; using a refractive lens; and altering the canopy profile. This evaluation showed that increasing the transparency length would provide the greatest increase in rearward visibility with the least distortion. The feasibility of extending the transparency was analyzed using a finite element model which showed that the transparency could be extended without increasing the maximum stress levels. Advanced composites were used to design an alternate canopy frame to allow the transparency to be extended by five inches. This frame was designed to be as stiff and strong as the current aft frame. The design required no modification to the surrounding fuselage and did not change the overall canopy weight.


Descriptors :   *VISIBILITY , *AIRCRAFT CANOPIES , TEST AND EVALUATION , MIRRORS , MODELS , MODIFICATION , WEIGHT , FRAMES , DISTORTION , TRANSPARENCIES , PILOT STUDIES , EXTERNAL , FUSELAGES , PRESSURE MEASUREMENT , PROFILES , INTERNAL , LENGTH


Subject Categories : Aircraft
      Optics


Distribution Statement : APPROVED FOR PUBLIC RELEASE