The 6 engine (4 Turbo Prop, 2 Jet) A6-Anura, Amphibious Cargo/Tanker. Designed by a team of gloriously drunk aero-engineers, their mums, and a bloke called Ron (who wandered in off the street), was built from 1949 to 1960. Great numbers of these giant seaplanes were produced, despite the annoying glitch of the Anura's complete inability to fly!
Despite it's fondness for terra firma, in 1953, A squadron of Anuras proved their durabilty and ruggedness, by becoming the first aircraft to sail around the world!
Sadly the Anura production line was closed down on January 10th 1960, after it was discovered (in a simulation) that the Anura might possibly blow up if it flew higher than 129,000 feet. This was disputed by devotees of the Anura, who pointed out that the same scientist who proclaimed the high altitude explodability of their beloved plane, had said exactly the same thing about the Melbourne Trams! Yet they were still running! (A story persists, though unproven, that said scientist was unreliable, because of depression bought on by his fiance blowing up at pre-nuptual picnic)
As the last A6 rolled off the line, a commemorative stamp was issued showing the 'Flying Frog' as it was affectionately known, soaring through the air. (This was of course an artist's conception)