Model aircraft

Model planes are small versions of real planes.

Some models are for flying. You can use paper or light wood to make them.

Other models do not fly. They are for looking at on a shelf.

People build them from kits. You might use glue to put them together. You can also use paint to make them look real.

Making models is a fun hobby for many people.

Model aircraft are small versions of real planes.

Some models look like real planes. Others look like birds or bats. People build them for fun or for work.

There are two main types of models. The first type is non-flying. These are called static models. People put them on shelves for display. Some are simple toys made of plastic. Other models are very detailed. They can take thousands of hours to make.

Scientists also use them. They put models in a wind tunnel to test new designs.

The second type is flying models. Some are simple gliders made of paper or foam. Others use engines to fly.

You can control them in different ways. Some fly on their own. Some use strings to fly in circles. Others use a radio controller.

Modern models even use computers to help them fly. Builders use many materials like wood, plastic, or metal. They must make them strong but very light.

Model aircraft are small versions of real or imagined planes.

People build them for many reasons. Some build them for fun or to show off. Others use them for serious research. There are two main groups of models. These are flying models and non-flying models. Non-flying models are also called static or shelf models.

They are great for looking at or learning about history.

Building a model can happen in many ways. Static models often come in kits made of plastic.

These kits use injection-molded polystyrene. This is a way to melt plastic pellets into liquid. The liquid is forced into steel molds under high pressure. This makes many identical parts very quickly. Some people build models from scratch using wood or metal. Flying models must be very light and strong.

Builders use balsa wood, foam, or even thin tissue paper. Some even use carbon fiber to make them tough.

Model making has a long and interesting history. In 1932, a company called Skybirds introduced the 1:72 scale.

This scale became very popular later on. During the Second World War, the US War Department used it too. They wanted people to learn how to recognize real planes. They used 1:72 scale for single-engine planes. They used 1:144 scale for planes with many engines. This helped people learn through practice and play.

There are many specific sizes called scales for these models. A scale like 1:48 means one inch equals four feet. Some models are huge, while others are tiny. Plastic kits often come in sizes like 1:72 or 1:24. Metal models can be as small as 1:600 scale. Airlines sometimes use large models to promote their business. They might give them to officials or travel agencies. These models help celebrate new flight paths or big achievements.

Flying models use different ways to stay in the air.

Some are free-flight models that fly on their own. Others use control lines, which are strings tied to a pivot. These models fly in circles around the person holding them.

Modern models use radio controllers to send signals. A receiver in the plane hears the signal from a transmitter. This moves small parts called servos to steer the plane. Some even use computers to help them fly smoothly. This is how many modern quadcopters work today.

Model aircraft are physical representations of real or imagined flying machines.

People build these models for various purposes. Some create them for amusement or display. Others use them for scientific research or engineering. These models are divided into two primary categories. The first group consists of non-flying models, also called static or shelf models.

The second group includes flying models, which are designed for aeromodelling. Aeromodelling is the practice of building and operating aircraft that actually fly.

Static models serve many important functions in the world of aviation. They are used for education and museum displays. Aircraft manufacturers also use them for research in wind tunnels.

In a wind tunnel, these models help scientists test aerodynamic properties. They can test how air flows around a new design. Researchers may even build models of only part of an aircraft. These models often have parts that can be swapped. This allows engineers to compare different fittings or configurations. They might also use sensors to take specific measurements during these tests.

There are several ways to manufacture the parts for these models. Many plastic kits use a process called injection molding.

In this process, plastic pellets are heated until they become liquid. This liquid is forced into steel molds under high pressure. The molds use "trees" to hold all the individual parts together. This method allows for very fast and automated production. For smaller production runs, companies might use copper, resin, or rubber molds. While these are cheaper to make, they are less durable. Some highly detailed models are even made using photo-etched metal.

Scale is a vital concept in model making to ensure accuracy. A scale defines the ratio between the model and the real aircraft. For example, a 1:48 scale model means one inch represents four feet. Common plastic kit scales include 1:72, 1:48, and 1:24. Metal die-cast models can be much smaller, reaching scales like 1:600. Some older models did not follow set scales. These were simply sized to fit the box and are called "Box Scale." Scales are generally based on either the Metric or Imperial systems.

The history of model scales is tied to the growth of aviation. The 1:72 scale was first introduced by Skybirds in 1932.

This scale was later used by the Frog brand starting in 1936. During the Second World War, the US War Department popularized 1:72 scale. They used it for single-engine aircraft to help people learn aircraft recognition. For multi-engine aircraft, they requested a 1:144 scale. These sizes provided a good compromise between size and fine detail. After the war, manufacturers continued to use these established scales.

Flying models require different construction methods to manage weight and strength.

Builders often use light woods like balsa or bamboo. They might also use foam polystyrene or even carbon fiber. To create a smooth surface, they may use aircraft dope or tissue paper. For very light models, builders use a special microfilm covering. This is made by spreading lacquer over water and lifting a thin film. Larger, powered models often use heat-shrinkable synthetic fabrics. Some modern kits are sold as "Almost Ready to Fly" (ARF) to save time.

There are three main ways to control a flying model.

Free-flight (F/F) models are uncontrolled and rely on natural stability. They are often unpowered gliders or rubber-powered planes.

Control line (C/L) models are tethered to a central pivot by wires. The pilot controls the plane as it flies in circles. Finally, radio-controlled aircraft use a transmitter and a receiver. The transmitter sends signals to servos that move the flight controls. Modern models even use flight control computers to fly autonomously. This technology is very similar to how quadcopters operate today.