The 1961 Guppy plane, referred to as the “Pregnant Guppy,” was a design conceived by former U.S. Air Force pilot Jack Conroy. It was essentially a modification of the Boeing Model 377. The cargo bay of the Guppy measured a particularly wide 20-feet in diameter, according to CNN.
Following the successful flight of the first Guppy plane, Conroy’s company, ASI, made another a second iteration of the aircraft three years later. It was named the “Super Guppy” as it came with a bigger, 25-meter-diameter compartment and better high-powered engines. Access to the cargo bay was also changed. Instead of disconnecting the tail, the Super Guppy featured a hinged nose for much easier frontal loading.
The last evolution of the Guppy planes is the Super Guppy Turbine (SGT) which was just like the Super Guppy but with upgraded engines (Allison T-56 turboprops). CNN noted that the SGT boasted a slightly bigger cargo floor of 13 feet Aero Spaceline to the Super Guppy’s nine feet. Only four SGTs were made, two by Conroy’s company and the last two by the aerospace company Airbus.
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