ESTES E16-6 29mm Model Rocket Engines, (2pk)EST10034 E16 6 29mm Model Rocket Engines, (2pk) The E16 6 Engine (29 mm) by Estes Rockets is a powerful and versatile engine designed for single stage and upper stage flights. With a total impulse of 33. 68 N sec and a 6 second delay, it's perfect for mid to high power rockets requiring precise parachute deployment and reliable performance. Capable of lifting rockets up to 16 ounces (453 grams) to impressive altitudes, this engine is ideal for