The Convair XC-99
This is one more monster plane that is considered a pioneer. The Convair XC-99 is only bested by Hercules as the largest piston engine-powered aircraft in history. It has a wingspan measuring 230 feet and six rear-mounted turbines. Clearly, it is a force to be reckoned with! During one mission, it delivered cargo weighing 40,000 tons. It was retired in 1957 and now resides in Ohio.
The Convair XC-99
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