| After the successful flight of the man-carrying vehicle | | | | located ¼ of the wing chord. Balancing it is by |
| made by the Wright brothers, interest in aviation | | | | placing your fingers on both sides of the wing, then |
| spread rapidly and many models were made. Model | | | | relocating the receiver, batteries and servos until the |
| airplane enthusiasts are already existing in the early | | | | airplane is balanced. |
| 1900s'. Most of the models are rubber powered, | | | | You may ask why the center of gravity is located |
| twining type with double stick fuselages that are | | | | ¼ of the wing chord? It has something to do |
| common in Europe. But even in the early days of | | | | with aerodynamic center, neutral point that can be |
| model flying, small petrol and compressed air engines | | | | explained in detail with some illustrations by following |
| are already being used. The materials used in model | | | | the link on the bottom. |
| constructions are birch strips, veneer, spruce, piano | | | | When you look at the cross section of the wing, the |
| wire or bamboo and oiled silk covering. | | | | shape is called an airfoil. Basically the airfoil consist of |
| Then balsa structure and tissue covering appeared in | | | | upper and lower camber, leading and trailing edge. |
| the United States in the late 1920s'. So much for the | | | | When the airplane is flying, there are aerodynamic |
| history of model aircraft. So you see, even today, | | | | forces that interact with the wings, vertical and |
| the airplane structure and how it fly is nodifferent | | | | horizontal stabilizers because the airplane is going |
| from the one we are flying today. The wings, | | | | against the air or commonly called "relative wind". |
| fuselage, vertical and horizontal stabilizers, propellers, | | | | Then it creates a variance of pressure on the upper |
| engines, landing gears are the same. The airplane, to | | | | versus the lower camber of the airfoil (or the wing |
| fly and have control during flight uses them. The | | | | itself) which generates lift. The air that passed the |
| wings are obviously responsible why the airplane | | | | lower camber should have a higher pressure against |
| canstay in the air for a long time. With proper design | | | | the upper camber to sustain flight. This has |
| of the airplane, dimensions, weight considerations and | | | | something to do with law of continuity. The air |
| aerodynamic design characteristics it will fly | | | | molecules that separates from the leading edge, |
| successfully. The aerodynamic principles behind it is | | | | going to the upper and lower camber, should meet at |
| what really makes it fly. But even though it has a | | | | the trailing edge at the same time. Since the upper |
| good design, weight and balance plays a major role. | | | | camber has a greater curve than the lower camber, |
| There was a saying that "a feather flies better than | | | | the distance on the upper camber is longer and |
| a brick" which is true because a very heavy airplane | | | | therefore requires more velocity to meet the air on |
| won't fly if it cannot be sustained by its power plant | | | | the lower camber. This creates a lower pressure on |
| (engine, propeller, and fuel tank). And with regards to | | | | the upper camber based on the Bernoulli's theorem, |
| balancing, a well-balanced airplane is controllable during | | | | "as the velocity of air increases, pressure decreases" |
| flight. Usually the fulcrum or center of gravity is | | | | Hope my brief explanation is understandable. |