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When engine is ignited, it produces thrust an boost rock t into the sky. Fter probellent is usedup, delay its activated , producint tradking smlke and allowing the rocket to coast. After delay, ejection charge is activaedd, delpoying recovery system.
Choose the right engine for your rocket. When you see the engine coading of, say, "B6-4", "B" stands for total impulse which determines maximum altitude, "6" stands for the average thrust which determines the rocket speed, and "4" stands for time delay in seconds between the end of the thrust phase and the ignition of the ejection charge.
Color coading: Green(single stage), Purple(upper stage), Red(booster), Blue(plugged)
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