Model aircraft are flying or non-flying models of existing or imaginary aircraft, often scaled-down versions of full size planes, using materials such as polystyrene, balsa wood, foam and fibreglass. Designs range from simple glider aircraft, to accurate scale models, some of which can be very large. Models may be built either as static non-flying models, or as flying models. Construction techniques for the two are usually very different. Static model aircraft Fokker F28 Schabak Modelle US Airways Airbus A330 Tamiya 1/48 scale Brewster Buffalo aircraftStatic model aircraft (i.
e those not intended to fly) are scale models are built using plastic, wood, metal or paper. Some static models are scaled for use in wind tunnels, where the data acquired is used to aid the design of full scale aircraft. Collectors can buy models that have already been built and painted, models that require construction, painting and gluing, or models that have been painted but need to be snapped together. Snap models require minimal construction and are becoming increasingly popular.  Promotional useMost of the world’s airlines allow their fleet aircraft to be modeled as a form of publicity.
 In the early days, airlines would order large models of their aircraft and supply them to travel agencies as a promotional item.  Scale In static models, the most popular scales are 1:72 and 1:48, followed closely by 1:32. 1:144 is popular for civil airliners, and there is a growing range of military subjects.  More detailed models are available at 1:32 and 1:24. Some manufacturers introduced 1:50 scale and 1:30 scale. Japan offers 1:100.The French firm Heller SA is the only manufacturer to offer models in the scale of 1:125.
Herpa and others produce promotional models for airlines in scales including 1:200, 1:400, 1:500, 1:600, 1:1000 and more. A few First World War aircraft were offered at 1:28 by Aurora. Other less popular scales are 1:50, 1:64, 1:96, and 1:128; however, old models are often revived in these scales. Many older plastic models, such as those built by Revell do not conform to any established scale.
They are sized to fit inside standard sized boxes.These kits are often called “box-scale” and are often reissued in their original, unusual scales.  Some helicopters used to be offered in 1:32 scale, similar to some fixed-wing aircraft models. The trend is to issue helicopters in 1:35 scale, similar to most land vehicle models.  Media The most common form of manufacture for kits is injection molded polystyrene plastic, using carbon steel molds. Today, this takes place mostly in China, Taiwan, the Philippines, South Korea, and Eastern Europe.
Injection molding allows a high degree of precision and automation not found in other manufacturing processes.Smaller and cheaper runs can be done with cast copper molds, and some companies do even smaller runs using cast resin molds, but the quality and precision is of a lower standard than carbon steel. The next most common form of manufacture is cast resin, using silicone rubber molds placed in vacuum chambers to reduce the incidence of bubbles in the castings. This form of manufacture is labor-intensive and involves a degree of waste because the resin attacks the silicone and the molds can only be used about 20-30 times before a new mold needs to be made.
The flexibility of the mold does allow shapes and undercuts not possible with any other manufacturing method. This sort of manufacture is reserved for unusual or esoteric subjects in relatively small production runs, and are consequently far more expensive than injection molded plastic kits.  Vacuum-formed polystyrene kits are still being made, but a greater amount of effort is required by the consumer to produce an acceptable model compared to the aforementioned methods. citation needed] There is a handful of photo etched metal kits which allow a high level of detail but can be laborious to assemble.  Specialized kits cast in resin are available from companies such as Anigrand, Collect Aire, CMK, and Unicraft. Scale models can be made from paper (normal or heavy) or card stock.
Commercial models are printed by publishers mainly based in Eastern Europe. Card models are also distributed through the internet, and several are offered this way for free. Card model kits are not limited to ust aircraft, with kits being available for all types of vehicles, buildings, computers, firearms and animals. From the World War I through the 1950s, model airplanes were built from light weight balsa wood and often covered with tissue paper. This was a difficult, time consuming procedure that mirrored the actual construction of airplanes through the end of World War II. The Cleveland Model and Supply Corporation made the most challenging kits, although many model makers became adept at creating models from actual aircraft drawings. 7] Ready-made models (desk-top models) include those produced in fibreglass for travel agents and aircraft manufacturers, as well as collectors models made from die-cast metal, mahogany and plastic.
. Snap Fit plastic plane models are manufactured by Wooster, Long Prosper, and Flight Miniatures  Flying model aircraft Main article: Radio-controlled aircraft A free-flight hand-launched glider. Flying models are usually what is meant by the term aeromodelling. Most flying model aircraft can be placed in one of three groups: