Another big motor that actually got a lot of use.
• Aero Spacelines Mini Guppy
• Aero Spacelines Pregnant Guppy
• Boeing 377 Stratocruiser
• Boeing B-50 Superfortress
• Boeing C-97 Stratofreighter
• Boeing KC-97 Stratotanker
• Boeing XF8B
• Boeing XB-44 Superfortress
• Convair B-36
• Convair XC-99
• Curtiss XBTC
• Douglas C-74 Globemaster
• Douglas C-124 Globemaster II
• Douglas TB2D Skypirate
• Fairchild C-119 Flying Boxcar
• Fairchild C-120 Packplane
• Goodyear F2G Corsair
• Hughes H-4 Hercules ("Spruce Goose")
• Hughes XF-11
• Lockheed R6V Constitution
• Martin AM Mauler
• Martin JRM Mars
• Martin P4M Mercator
• Northrop B-35
• Republic XP-72
• Republic XF-12 Rainbow
• SNCASE SE-2010 Armagnac
• Vultee A-41