Rocketry Starter Sets & Engines > Estes 24mm D Size   Estes C11-0 24mm (3-pak) model rocket engine The Estes C11-0 engine is a booster stage engine (red label) designed for model rocket flight and has to be used with a standard engine. This engine is for flights in rockets weighing less than 6 ounces, including the engines. Retail Price: $ 11.79 *** SAVE: $ 2.84 *** $ 8.95          Available: 1      More Information      Quantity:     Estes C11-3 24mm (3-pak) model rocket engine The Estes C11-3 engine is a single stage engine (green label) designed for model rocket flight. This engine is a standard engine designed for flights in rockets weighing less than 6 ounces, including the engine. Retail Price: $ 11.79 *** SAVE: $ 2.84 *** $ 8.95          Available: 2      More Information      Quantity:     Estes C11-5 24mm (3-pak) model rocket engine The Estes C11-5 engine is a single stage engine (green label) designed for model rocket flight. This engine is a standard engine designed for flights in rockets weighing less than 5 ounces, including the engine. Retail Price: $ 11.79 *** SAVE: $ 2.84 *** $ 8.95          Available: 2      More Information      Quantity:     Estes C11-7 24mm (3-pak) model rocket engine The Estes C11-7 engine is an upper stage engine (purple engine) designed for model rocket flight. This engine can also be used as a single stage engine in lightweight rockets. Retail Price: $ 11.79 *** SAVE: $ 2.84 *** $ 8.95          Available: 3      More Information      Quantity:     Estes D11-P 24mm (3-pak) model rocket engine Plugged engine (blue label) - used for R/C gliders and contains no delay or ejection charge. Retail Price: $ 14.49 *** SAVE: $ 3.50 *** $ 10.99          Available: 4      More Information      Quantity:     Estes D12-0 24mm (3-pak) model rocket engine Booster stage engine (red label) - contains no delay or ejection charge. $ 11.95          Out of Stock      More Information Estes D12-3 24mm (3-pak) model rocket engine Single stage engine (green label) $ 11.95          Available: 5      More Information      Quantity:     Estes D12-5 24mm (3-pak) model rocket engine Single stage engine (green label) $ 11.95          Out of Stock      More Information Estes D12-7 24mm (3-pak) model rocket engine Upper stage engine (purple label) - can also be used as a single stage engine. $ 11.95          Available: 2      More Information      Quantity: