KS-1 air-to-surface missile (piloted prototype)
I-270 (powerplant: 3,570 lbs of nitric acid, 970 pounds of kerosene, and 132 pounds of hydrogen peroxide)
SP-10 (MiG-17PF modified for new cannon tests)
YE-6T3 (MiG-21F with canards for testing)
105-11 (prototype for shuttle program handling & procedure tests)