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Flying Machines Long before we had aeroplanes, people had been experimenting with different flying machines.Hot-air balloon s pilots steer their aircraft by ascending or descending into air currents that move the balloon.Helicopters first appeared during World War II. A helicopter hasn't got wings, but, like an aeroplane, it's got an engine that makes its blades spin at high speeds.The pilot controls the balloon's movement by heating the air inside the balloon, or by allowing it to cool naturally.Hot-air balloons and gliders use air currents, for movement.A glider also uses air currents to soar and glide.?????????????????????

Flying Machines
Long before we had aeroplanes, people had been experimenting with different flying machines. We still use some of those flying machines today. Some depend on air for movement, while others use engines.
تيارة الهواء
Hot-air balloons and gliders use air currents, for movement. Hot-air balloon s pilots steer their aircraft by ascending or descending into air currents that move the balloon. The pilot controls the balloon's movement by heating the air inside the balloon, or by allowing it to cool naturally. A glider also uses air currents to soar and glide. Small planes pull gliders along a runway to help them take off. But once in the air, gliders use the currents, not an engine, to move. Their long wingspan and strong 10 body give riders a safe, smooth flight. Hot-air balloons and gliders are most often used for fun and adventure.
المكان
احمد
Helicopters first appeared during World War II. A helicopter hasn't got wings, but, like an aeroplane, it's got an engine that makes its blades spin at high speeds. This allows the helicopter to ascend into the sky. Unlike an aeroplane, which has 15 to keep moving, helicopters can stay in one place in the sky for a long time. Today, helicopters are mostly used by medical teams and the military. But you can also take a helicopter ride for fun. Many tourist destinations offer helicopter rides for sightseeing.
So before your next plane ride, remember that planes aren't the only 20 way to fly. Which type of flying machine would you most like to travel in?