Why doesn’t my rocket need an engine hook?

Many Estes model rockets are designed without an engine hook. Instead they rely on friction fit to hold the engine in place. If an engine is too loose in a model rocket that utilizes friction fit, a piece of masking tape can be wrapped around the engine to make it fit more tightly. The engine should not fall out of the rocket during flight—unless designed to do so, as in featherweight recovery model rockets.