The Rocket and Recovery System

Giovanni Lavermicocca
Engineering
Period 5
Oct, 18 210
The rocket and recovery system
Is a missile, spacecraft, aircraft or other vehicle which obtains thrust from a rocket engine. In all rockets, the exhaust is formed entirely from propellants carried within the rocket before use. Rocket engines work by action and reaction. Rocket engines push rockets forwards simply by throwing their exhaust backwards extremely fast. Usually the rocket are propellant by chemical, and this rockets store a large amount of energy in an easily released form, and can be very dangerous.
All rockets have Thrust is the force that makes a rocket move off the launch pad. This is a demonstration of Newton’s Third Law of Motion:“For every action there is an equal and opposite reaction.” The action of the gas escaping through the engine nozzle leads to the reaction of the rocket moving in the opposite direction.
The most of rockets return to earth through recovery system, but What is a recovery system? This is an assembly of components that enable the launcher, coiffed or payload to be recovered undamaged and reusable.
Some methods are the Featherweight recovery: is only appropriate for the tiniest of rockets, is to let the rocket flutter back to earth after ejecting the motor. Also these method destabilize the rocket to prevent it from entering a ballistic trajectory on its way back to earth.
Other method is collapsible impact absorbing structure: That is either sacrificial, this it has honeycomb that Impact absorbent structures that absorb the high energy deceleration loading. It is like the legs of the NASA moon lunar Lander module where made from hollow telescopic legs filled with light aluminum honeycomb. That simply crushed on landing as the leg strut telescoped. Here the energy required to plastically collapse the aluminum honeycomb can be used to absorb the impact energy of the rocket and reduce severe levels of deceleration.
The most used recovery system is Parachute deployment at fixed point during rocket flight in the models full scale flight systems and we built (Estes Rockets). The process in both are similar. when the propellant is used up, the engine’s time delay is activated. The engine’s time delay produces a visible smoke trail used in tracking, but no thrust. The fast moving rocket now begins to decelerate (slow down) as it coasts upward toward peak altitude (apogee). The rocket slows down due to the pull of gravity and the friction created as it moves through the atmosphere. The effect of this atmospheric friction is called drag.
When the rocket has slowed enough, it will stop going up and begin to arc over and head downward. This high point or peak altitude is the apogee. At this point the engine’s time delay is used up and the ejection charge is activated. The ejection charge is above the delay element. It produces hot gases that expand and blow away the cap at the top of the engine. The ejection charge generates a large volume of gas that expands forward and pushes the recovery system (parachute) out of the top of the rocket.
The recovery system is activated and provides a slow, gentle and soft landing. The Estes's rocket can now be prepared for another launch and the real rockets, the peole can open the door and exit outside or pick up the good parts by rockets for study its damage.
Example of model rocket flight by Estes.