The wind hits the kite at an angle making an area of high pressure on the front side of the kite, where the air is "squeezed together", and a low pressure area on the back side of the kite. Since objects try to go in the direction of the lowest pressure, lift is created, keeping the kite in the air.
Gliders do not have any engine or source of power.
How does a glider fly?
Gliders fly using the currents of the wind, and the special shape of their wings.
List 2 ways a glider can be launched.
1) A giant elastic band shoots the glider into the air like a sling shot. 2) They are towed in the sky behind an airplane, and at a certain point, and unhooked from the plane so that it can glide.
Describe how a glider's wings work.
When the leading edge of the wing goes through the air, the air is split by the wing. The air moving over longer, curved top of the wing travels faster than the air under the bottom of the wing. Objects try to go in the direction of low pressure air, which provides lift for the glider.
What controls the direction of the glider, and where is it located?
Direction is controlled by the rudder, which is located at the back of the glider.
What controls the up and down movement of the glider, and where is it located?
Up and down movement is controlled by moving the elevators, which are located at the back of the glider.
What are thermals, and how are they used to keep gliders in the air?
Thermals are rising air currents. They are caused by areas that heat up quickly in the sun, like a dark field. Because hot air rises, it will help the glider stay in the air.
How do mountains/hills help a glider fly?
If wind were to hit a mountain/hill, the wind would be deflected upwards, causing air currents to go up and lift a glider very high.
They both use the special shape of their wings to fly.
What is a Propeller-Driven Airplane?
They are airplanes that use a propeller to move the plane through the air.
How do blades on an airplane help with flying?
When the blades spin, they "bite" into the air in the front of the plane and push it towards the back of the plane. This makes the plane move forward, moving air over the wings and creating lift.
When were jet engines developed, and where?
During World War II, in Germany.
How does a jet-driven airplane work?
First, a turbine in the front of the engine spins and "draws" cold outside air into the engine. Next, the air is mixed with jet fuel. A spark lights the jet fuel, and the air is heated and expands. Then, the spinning turbine at the front stops the heated air from escaping from the front, so the air would instead escape at the rear engine. The escaping gases go backwards, sending the plane forwards. (Newton''s Third Law)
What are 2 advantages that a propeller-driven plane have over a jet plane?