Accession Number : AD0001642


Title :   DEVELOPMENT OF HIGH PERFORMANCE ROTARY WING, TIPMOUNTED PULSE-JET ENGINE COMPONENTS


Descriptive Note : Quarterly engineering rept. No. 4


Corporate Author : FAIRCHILD ENGINE AND AIRPLANE CORP COSTA MESA CA FAIRCHILD ELECTROTECHNICS DIV


Personal Author(s) : BARRETT, W K


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/001642.pdf


Report Date : 15 Nov 1952


Pagination or Media Count : 17


Abstract : A 35% increase in cooling air inlet duct area increased the structural strength of the conical engines. Aluminum proved inadequate for fabrication of the cooling air baffle. The XPJ-49-AH-1 (AJ-7.5) inlet valve was tested 38 hrs. without failure. The valve tensiometer was fabricated, and the spring elements were calibrated. A set of lower frequency reeds and a multiple-pointfuel- injection system were designed and fabricated for the 10.0-in.-diam.engine. The thrust performance of 4 cowling configurations was evaluated and the high-speed superiority of the short-lip circular type proven. Three designs of 6.75-in.- diam. development engines, as well as the XPJ-43-AH-1 (AJ-9.4) and XPJ-49-AH-1 (AJ-7.5) engines, were tested at high tip speeds on the special low-g test stand. The XPJ-43-AH-1 engine was tested to 450 ft./sec. and the smaller engines were tested to 550 ft./sec. The altitude effect on cowling parameters, inlet valve parameters, venturi parameters and tube geometry was investigated.


Descriptors :   *CONICAL BODIES , *ENGINES , COOLING , GEOMETRY , VALVES , ALTITUDE , THRUST , INLETS , SPRINGS , TUBES , TENSIOMETERS , BAFFLES , VENTURI TUBES , AIR , PARAMETERS


Subject Categories : Aircraft
      Numerical Mathematics


Distribution Statement : APPROVED FOR PUBLIC RELEASE