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Foamy Advantages
Foam material is relatively new to model airplane hobby industry, but it has revolutionized the industry quite dramatically in recent years.

The foam materials for model airplane construction have proven their values both in the store and in the field because of certain advantages these materials have over the conventional one.In Model-Aircrafts.com some of these reletively distinctive advantages of foam material are outlined as follow
7 advantages of foam material:
[1] Foam material is usually inexpensive and widely available from most building supply or RC hobby stores. Therefore you don’t have to break the bank for building your own custom-designed model airplanes with foam materials.
[2] In general most foam materials that are suitable for building foamy model airplanes will have no troubles for being used as a clever combination with other conventional materials such as the balsa sheets or sticks, fiberglass etc.
[3] Physically it is waterproof, lightweight, strong and somehow or very flexible. Several advantages come out from these physical characteristics of foam material being that model airplanes made of foamy are in general easy to maintain, durable, tough and virtually crash-proof.
[4] Easy for handling, transporting and storage as implied by its physical characteristics (i.e. light weight etc.).
[5] Without having to concern about grain direction and splitting like with balsa wood.
[6] Foam material is very consistent and each sheet or block is almost indistinguishable to every other piece.
Therefore, you don’t have to worry about material selection or to spend hours at the hobby stores looking for suitable matching/identical pieces for your model airplane building project.
[7] It is easy to work with mainly as a result of its physical characteristics.
Hence the use of suitable foam materials make possible for the speed and accuracy of model airplane construction, even if it is for building the components of irregular shape such as the airfoils.