Flying model rockets is a relatively
and inexpensive way for students
to learn the basics of forces and
the response of a vehicle to external forces.
Like an airplane, a model rocket is
subjected to the
forces of weight,
thrust, and aerodynamics
On this slide we show the parts of a single stage model rocket. We have laid
the rocket on its side
and cut a hole in the body tube so that we can see what is inside.
Beginning at the far right, the body of the rocket is a green cardboard
tube with black fins attached at the rear. The fins can be made of either
plastic or balsa wood and are used to provide
stability during flight.
Model rockets use small, pre-packaged,
solid fuel engines
The engine is
only once, and then is replaced with a new engine for the next flight.
Engines come in a variety of
and can be purchased at hobby stores and at some toy stores.
The thrust of the engine is transmitted to the body of the rocket through
the engine mount. This part is fixed to the rocket and can be
made of heavy cardboard or wood. There is a hole through the engine mount
to allow the ejection charge of the engine to pressurize the body tube
at the end of the coasting phase
and eject the nose cone and the recovery system. Recovery wadding is
inserted between the engine mount and the recovery system to prevent the hot
gas of the ejection charge from damaging the recovery system. The recovery
wadding is sold with the engine. The recovery
system consists of a
parachute (or a streamer) and some lines to connect
the parachute to the nose cone. Parachutes and streamers are made of thin
sheets of plastic. The nose cone can be made of balsa wood, or plastic,
and may be either solid or hollow. The nose cone is inserted into the body
tube before flight. An elastic shock cord is connected to both the
body tube and the nose cone and is used to keep all the parts of the
rocket together during recovery.
The launch lugs are small tubes (straws) which are attached to the
body tube. The launch rail is inserted through these tubes to provide
stability to the rocket during launch.
Types of Rockets:
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