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what are the physics of an elastic launched glider?

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Adrian aguiler

on 5 November 2014

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Transcript of what are the physics of an elastic launched glider?

what are the physics of an elastic launched glider?
How to angle the glider
The four forces of flight
The four forces of flight are

*Weight (Gravity)
how do you make a glider
here's a video showing how to make a balsa wood glider
glider blueprints
A far better method of controlling the launch height is a process called "shortening". What you do is start with a relatively loose loop of elastic that, when stretched as far as your arms will allow, does not get the glider all the way to the ceiling. Once you are at the competition area, test-launch by pulling this loose loop back as far as you can, and launching the glider. If the glider does not make it as high as you want it to, shorten the elastic, perhaps by looping it around the launch handle, and launch the glider again by pulling the elastic back as far as your arms allow. Repeat this process until the glider ascends to the desired height.

How to controll launch height
How to grip the Glider
One very easy problem to fix, but one that could cause legitimate damage to your glider if not acknowledged, is how to hold your glider in the launch. With the simple simon design, one easy way to hold your glider is by gripping it from the top behind the wings, with your thumb on one side and fingers of the other, with none of your fingers going further than the plane of the bottom of the fuselage. This way, when the glide shoots upward out of your hand, the elevator goes beneath your fingers, and the rudder goes between your fingers and your thumb, and no part of the tail is damaged
As stated in other parts of this article, the launching of the glider into the air is ballistic, not aerodynamic; i.e. the glider is not flying to the ceiling, you are throwing it there. However, it is very important to note that aerodynamics are involved in the ascent. If the glider were to be simply launched into the air without any thought, it would likely stall and fall back to the ground. Instead, what you want to do is launch it in such a way that it aerodynamically corkscrews to the ceiling without stalling. The spiral will only contain a small number of rotations; maybe 1 to 1.5 turns (this is why it might be hard to observe in videos). Now, as each glider is different, the exact angle of launch will be different for success, but in general it goes like this:

1. Hold the launcher in one hand and glider attached to the elastic loop in the other.

2. Stretch the elastic the desired amount, and hold the system vertically. The elastic loop should be in a vertical line.

3. Move the glider a small distance horizontally away from the launch handle. This way, when you the glider is less likely to hit the handle.

4. Tilt the system so that it is not vertical but 70 to 80 degrees in respect to the ground. This is so the the glider does not go straight up and thus can transition into its glide.

5. Roll the glider (rotate it about the axis of the fuselage) about 45 degrees. Make sure to roll the launch handle (i.e. rotate your wrist of the hand with the launch handle) the same amount! This is what gives the corkscrew ascent.

6. Launch and pray.

>You will need the following
*wood (balsa in the video)
*A rubber band to launch the glider
*& a kno age on airplanes

the propulsive force of a jet or rocket engine
is the component of the total aerodynamic force perpendicular to the flow direction, and drag is the component parallel to the flow direction.
During a flight the aircraft burns up its fuel, so the weight of the airplane constantly changes
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