Development
In 1960, U.S. airlines were disposing of their obsolete piston-engined Boeing 377 Stratocruisers in favor of the newer jet-engined airliners. NASA was finding that barge transport of their increasingly large space program components from manufacturers on the West Coast to test and launch sites on the East Coast was slow and expensive. Aircraft broker Leo Mansdorf was stockpiling surplus Stratocruisers at Van Nuys prior to resale, and ex-USAF pilot John M. Conroy realized the potential of these aircraft to transport the large but relatively light rocket components.
Conroy presented his plans for an extensively modified Stratocruiser to NASA, where an official commented that the bloated aircraft resembled a pregnant guppy. Although NASA was lukewarm on the concept, Conroy mortgaged his house and founded Aero Spacelines International in order to build and operate the concept aircraft.
Conversion work was undertaken by On Mark Engineering. The Pregnant Guppy (registered N1024V) was built from an ex-Pan Am airframe with a five-meter section from an ex-BOAC aircraft (G-AKGJ) added immediately behind the wing. The wing, engines, tail, nose and cockpit were unchanged, but a new upper fuselage of six meters diameter was added, giving the aircraft a "triple-bubble" appearance in front view. The entire rear section (including tail surfaces) was detachable to allow cargo to be loaded directly into the fuselage.
The aircraft first flew on September 19, 1962, piloted by John M. Conroy and co-pilot Clay Lacy. When Van Nuys traffic control realized that Conroy intended to take off, they notified police and fire departments to be on alert. However the huge aircraft performed flawlessly, the only difference in handling being a slight decrease in speed caused by extra drag of the larger fuselage.
Carrying the S-IV Saturn I rocket stage, the Guppy saved three weeks transit time versus barge, for a cost of $16.00 per mile.
Read more about this topic: Aero Spacelines Pregnant Guppy
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