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SOLID ROCKET MOTORS

Aerotech Single use motor ..................Ceserione Pro38 reloadable motor

The propellant for high power solid rocket motors is usually ammonium perchlorate. It is cast into cylinders of propellant these are called grains, and as such many of the motor case sizes are governed by how many grains they hold.

Solid rocket motor come in two basic types, single use motors and re-loadable motors.

The single use motors are as the name imply's, are single use after they have been used the remains including the case go in the bin. they come in a number of sizes but due partly to cost are only really available up to G class.

Re-loadable Solid Motor consist of a reusable case and forward and rear closures, to uses a re-loadable motor you must buy a motor reload kit applicable to the size of motor case you have. re-loadable motor start from D class and go up to O class and above.

There are lots of motor manufacturers and each sells there own hardware sets, but the reload kits are not interchangeable you can not use a Pro38 kit in a 38mm Rousetech Case.

Anatomy of a rocket motor.

Propellant (Red)    Nozzle (Gray)

Case (L/Blue)       Delay charge (Green)

Ejection charge (Bright/Green)

 

The propellant(Grain) provides the thrust to the motor and is made up of an oxidizer and fuel.

  • ·         The oxidizer provides oxygen to drive the combustion chemical reaction. (Combustion, an oxidation reaction, is the combination of oxygen with some other substance.)
  • ·         The fuel is the substance witch actually "burns" (is oxidized). This reaction between the oxidizer and fuel generates gas and heat, which provides the thrust for the rocket.

The nozzle directs the gas formed by the reaction out the back of the rocket. The nozzle is formed such that the gasses are accelerated as they pass through the nozzle and provide efficient thrust.

The Case holds all the components of the motor together, and is made to withstand the pressure exerted upon it during the motor burn. 

The Delay Charge is a slow burning fuse, they come in fixed times of 3, 5, 7 or 10 seconds, alternatively they may be S, M, F (Slow, Medium or fast). On some motors it is possible to adjust the delay charge with a special delay adjusting tool.

The Ejection Charge is what separates the rocket into two halves in order to deploy the recovery device (parachute, streamer etc.)