Accession Number : ADA250517


Title :   Polyalphaolefins: A New Improved Cost Effective Aircraft Radar Coolant


Descriptive Note : Aircraft materials rept.


Corporate Author : AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA)


Personal Author(s) : Stropki, Michael A


Full Text : http://www.dtic.mil/dtic/tr/fulltext/u2/a250517.pdf


Report Date : Jun 1991


Pagination or Media Count : 21


Abstract : The use and potential problems associated with silicate ester (Coolanol) dielectric coolants in US military applications such as aircraft radar and missile systems are highlighted. These fluids have caused significant and sometimes catastrophic problems due to their hygroscopic nature and subsequent formation of flammable alcohols and silica gel. In some of the more advanced stages, a gelatinous precipitate has caused component malfunctions such as electrical arcing, filter clogging, and fires. Extensive and costly fluid monitoring procedures have brought the malfunction under control, but this has not eliminated the problem. The US Air Force and Navy have investigated the replacement of these silicate-ester-based fluids with a hydrogenated polyalphaolein-based (PAO) fluid in order to solve these material system problems. This report includes a brief historical perspective of silicate-ester related problems, the advantages and disadvantages of PAO, specific US Air Force/Navy aircraft system flight test programs, and current status of the US PAO conversion.


Descriptors :   *RADAR EQUIPMENT , *COOLANTS , AUSTRALIA , ALCOHOLS , FLAMMABILITY , HYGROSCOPICITY , SILICA GELS , FIRE HAZARDS


Subject Categories : Air Condition, Heating, Lighting & Ventilating
      Active & Passive Radar Detection & Equipment


Distribution Statement : APPROVED FOR PUBLIC RELEASE