Estes D12-3 Model Rocket Engines (2pk) - EST1566 66611A Strong metal gear train for

Strong metal gear train for added durability

Reedy 3300kV brushless motor

Automatic Flip Mode to easily perform 360° flips in any direction with the press of a button/stick

Interchangeable brass center rings

If your piston is damaged then the cylinder liner is more than likely damaged as well

Estes D12-3 Model Rocket Engines (2pk) - EST1566 66611A Strong metal gear train forThe Estes D12 3 is a single stage engine designed for model rocket flight. This engine is a standard engine designed for flights in rockets weighing less than 14 ounces, including the engine. Each package includes 2 engines, 2 starters, and 4 starter plugs.