Fellow SCFer 'tnichols' has been kind enough to submit his "
Illustrated History of the DC- 4 SkyMaster Aircraft Design Used on United States Airmail Postal Material Between 1946 and 1958" exhibit for publication on Stamp Smarter.
It can be viewed here
http://stampsmarter.com/Learning/al...yMaster.html
DC4 Skymaster SpecsFirst Flight: Feb. 14, 1942
Wingspan: 117 feet 6 inches
Length: 93 feet 5 inches
Height: 27 feet 7 inches
Operating Altitude: 10,000 feet
Range: 4,200 miles
Weight: 82,500 pounds
Power Plant: Four 1,450 horsepower Pratt & Whitney R-2000 "Twin-Wasp" engines
Speed: 207 mph
Don