@prefix ns0: . @prefix skos: . ns0:resource [ ] ; skos:changeNote """2018-04-05 15:21:39.0 [sritz] update Resource (image); insert WeightedRelation (id: null related concept uuid: f59652c5-eaa8-49c0-b65f-a0166048b1dd relationship type: null relationship value: null generated by: null); """ ; ns0:altLabel [ ] ; skos:definition """When the world's first jet airliner, the De Havilland Comet, was introduced in 1949, Douglas held a commanding position in the aircraft market. Although Boeing had pointed the way to the modern all-metal airliner in 1933 with the 247, it was Douglas that, more than any other company, made the promise a reality. Douglas produced a succession of piston-engined commercial aircraft through the 1930s, 1940s and 1950s: 138 DC-2s, 10,928 DC-3s (mostly for military service in World War II), 1453 DC-4s, 537 DC-6s and 226 DC-7s. Given the success of their designs, Douglas took the view that there was no reason to rush into anything new, as did their rivals Lockheed and Convair. Most air transport manufacturers expected that there would be a gradual switch, from piston engines to turbines and that it would be to the more fuel-efficient turboprop engines rather than pure jets. In contrast, Boeing took the bold step of starting to plan a pure jet airliner as early as 1949. Boeing's military arm had gained extensive experience with large, long-range jets through the B-47 Stratojet (first flight 1947) and the B-52 Stratofortress (1952). With thousands of their big jet bombers on order or in service, Boeing had developed a close relationship with the U.S. Air Force Strategic Air Command (SAC), and could count on having preference when the time came to replace SAC's fleet of piston-engined KC-97 Stratotankers. For Boeing, this was an opportunity to build a jet aircraft for air-to-air refueling that could be turned into a commercial transport. [Text provided by: http://en.wikipedia.org/wiki/Douglas_DC-8 ] [Photo provided by: http://www.aerospaceweb.org/ ] Group: Platform_Details Entry_ID: DC-8 Group: Platform_Identification Platform_Category: Aircraft Short_Name: DC-8 Long_Name: Douglas DC-8 End_Group Group: Platform_Associated_Instruments Short_Name: CAPS Short_Name: PRESSURE TRANSDUCERS Short_Name: TEMPERATURE PROBES Short_Name: PITOT-STATIC SYSTEM Short_Name: INS Short_Name: ROSEMOUNT PROBES Short_Name: CDP Short_Name: PIP Short_Name: DC8 DROPSONDES Short_Name: DROPSONDES End_Group Creation_Date: 2008-07-14 Online_Resource: http://www1.nasa.gov/centers/dryden/news/FactSheets/FS-050-DFRC.html Sample_Image: http://www.aerospaceweb.org/aircraft/jetliner/dc8/dc8_06.jpg Group: Platform_Logistics Primary_Sponsor: NASA End_Group End_Group"""@en ; skos:prefLabel "DC-8"@en ; skos:inScheme ; skos:broader ; a skos:Concept . skos:prefLabel "Aircraft"@en ; a skos:Concept ; skos:narrower .