A $350,000-conversion kit, expected to prolong the life of the Convair 240 Airliner into the 1960′s, has been offered by Convair. The program reaches turboprop power in two steps: first, an improvement program on the current piston-powered 340′s offering passenger-capacity increases ranging from 10 to 27%, a 15-mph increase in cruising speed, and a reduction in cabin noise; second, conversion of the basic 340 airframe to turboprop power by late 1955.
The converted military version designated YC-135, will have a top speed of 380 mph and a maximum cruising altitude of 30,000 ft. The best cruising altitude will be approximately 20,000 ft., where a cabin pressurization equivalent to 8,000 ft. altitude can be maintained.
Gross weight of the turboprop 340 will increase from 47,000 to 53,200 lb. Considerable improvement in takeoff and climb characteristics is expected.
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