It is vital that only flame-resistant materials be used as recovery wadding to prevent the ejected wadding from causing fires. Recovery wadding is typically chemically treated tissue paper or cellulose insulation. The ejection charge would melt a plastic parachute, so this protections is necessary. Recovery wadding is flame-resistant material that protects the parachute (or other recovery system components) from the hot blast of the motor ejection charge. More shroud lines can cause a simple flat parachute (a "parasheet") to form into a more nearly spherical shape, and therefore be more efficient. The number of shroud lines varies, but is typically 6 or 8 lines on a model rocket parachute. The shroud lines on most model rocket parachutes are made of strong thread, such as carpet thread, but they may also be made of other material. The shroud lines connect the parachute canopy to the rest of the rocket. Other recovery systems include streamer, featherweight, glide, helicopter, body drag, and tumble. The parachute is expelled from the body tube by the ejection charge of the rocket motor after a delay to allow the rocket to reach apogee and be traveling at a relatively slow speed. The parachute may be made from thin plastic or cloth. The most common type of recovery system is the parachute. Typical materials for shock cards are sewing elastic, rubber, nylon, and Kevlar.Īll model rockets require a recovery system to slow their descent and return them safely to the ground. The shock cord may be made of an elastic material to help absorb the shock of the separating parts coming to a halt at the ends of the cord, or it could be made from a non-elastic line (in which case it is normally longer). The shock cord holds the parts of the rocket together after they separate at ejection. It is also common to connect the shock cord (or a separate anchor line) to the front of the motor mount in larger-diameter rockets. There are many ways to do this, but the most common used in model rockets is a folded-paper mount glued to the inside of the body tube. The shock cord must be attached to the body of the rocket. In the model shown, the bottom of the transition is where the rocket separates when the parachute is elected. Transition sections are typically made from plastic, balsa wood, hardwood, fiberglass, or paper. The transition could be used to either increase or decrease the rocket's diameter at that point. Not all rocket designs incorporate a transition. The payload section can be used to carry a variety of payloads, such as electronic altimeters or cameras.Ī transition section is used to connect body tubes of different diameters. The model shown has a clear plastic payload section that allows any payload inside to be easily inspected visually. The nose cone is typically made from plastic, balsa wood, hardwood, fiberglass, or styrofoam. It could be conical in shape, but at subsonic speeds a rounded shape gives lower aerodynamic drag. The nose cone of the rocket has a shape that causes the air to flow smoothly around the rocket. Click on the part to learn more about it. Parts of a Model Rocket Point at a part of the rocket to learn its name.
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