Flying model rockets

Jun 17th, 2015
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Flying model rockets is a relatively safe and inexpensive way for students to learn the basics of forces and the response of a vehicle to external forces. A model rocket is subjected to four forces in flight; weight, thrust, and the aerodynamic forces,lift and drag. There are many different types of model rockets.

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Flying model rockets is a relativelysafeand inexpensive way for students to learn the basics offorcesand theresponseof a vehicle to external forces. A model rocket is subjected tofour forcesin flight;weight,thrust,and theaerodynamic forces,lift and drag. There are many different types of model rockets. One of the first and simplest type of rocket that a student encounters is the bottle, orwater rocket. The water rocket system consists of two main parts, the launcher and the rocket.On the figure we show a genericlauncher, although launchers come in a wide variety of shapes and sizes. The launcher has abaseto support the rocket during launch. A hollowlaunch tubeis mounted perpendicular to the base and is inserted into the base of the rocket before launch. The launch tube is connected to anair pumpby a hollowfeeder line. The pump is used to pressurize the inside of the body tube to providethrustfor the rocket. We have attached apressure gageto the feeder line to display the change in pressure in the system. This part of the system is very similar to the simplecompressed airrocket.The other part of the water rocket system is therocketitself. Usually the rocket is made from a 2-liter soda pop bottle. Before launch, the bottle is filled with some amount of water, which acts as the "propellant" for the launch. Since water is about 100 times heavier than air, the expelled water produces more thrust than compressed air alone

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