One thing that you really need to understand before you can build a toy plane that actually flies is what it is that makes planes fly in the first place. Luckily, with a little explanation, the basic scientific principles of plane flight arent too difficult to understand.
The key to flight, understandably, is the wings. Instead of flapping their wings like birds do, however, planes propel themselves forwards using an engine in much the same way a car does, and then rely on the shape of their wings to slowly lift them off the ground.
But why do a planes big, flat wings lift it off the ground? The answer is all to do with how the air travels over and under the wings. A planes wings are flatter on the bottom and more rounded on the top, which means that air takes longer to travel over the wings than under them. The higher air speed under the wings means that there is always more space for air to travel under than over effectively, the air is being forced to go under the wings. When the plane is moving fast, enough air is being forced under the wings that the plane takes off.
Once the plane is in the air, it can either glide using its wings and a little...
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