介紹大型航空模型制作結構材料的選擇前，先闡述一下選材的原則。除了那些用于專門競技或科研項目的模型外，航模大都屬于消費品范疇，控制制造成本非常重要。特別是進行大批量生產時，選材要易獲取、易加工。

Before introducing the selection of structural materials for the manufacture of large aviation models, the principles of material selection should be described first. In addition to those models used for special sports or scientific research projects, most aircraft models belong to the category of consumer goods, and it is very important to control manufacturing costs. Especially for mass production, material selection should be easy to obtain and process.

其次，航模對結構重量的控制非常敏感，因此要盡量選擇密度較小的材料，材料密度應顯著低于地面及水下交通工具。在確保強度足夠的情況下，要多使用輕薄的板材，并設計大量減重孔。固定翼類模型的翼展通常在一兩米，尺寸大的可達四五米甚更長。

Secondly, the aircraft model is very sensitive to the control of the weight of the structure, so we should try to select materials with smaller density, and the material density should be significantly lower than that of the ground and underwater vehicles. Under the condition of ensuring sufficient strength, more light and thin plates should be used and a large number of weight reduction holes should be designed. The wingspan of fixed-wing models is usually one or two meters, and the size can reach four or five meters or even longer.

這其中，大多數模型飛行速度較低，機翼的展弦比可達10以上，一些模型滑翔機的展弦比甚高達30以上。這類模型結構尺寸很大，通常采用薄壁結構，為保證在空氣動力作用下不發(fā)生較大的變形，必須選擇剛度大的材料。

Among them, most models have low flight speed, the aspect ratio of wings can reach more than 10, and some model gliders can even reach more than 30. This type of model has a large structure size and usually adopts a thin-walled structure. In order to ensure that no large deformation occurs under the aerodynamic action, the material with large stiffness must be selected.

受航模制造條件和使用范圍所限，在選材過程中，除上述要求外，在科研或比賽中使用的各類航模，因用途不同、級別不同，對結構材料的要求也不同。從用途上分，有教練機、滑翔機、特技機、競速機、載重飛機等;從動力上分，有電機驅動、活塞發(fā)動機驅動、渦噴發(fā)動機驅動、太陽能驅動（終也由電機驅動）等。

Limited by the manufacturing conditions and scope of use of aircraft models, in addition to the above requirements, various aircraft models used in scientific research or competition have different requirements for structural materials due to different purposes and levels. In terms of use, there are trainer aircraft, glider, stunt aircraft, racing aircraft, heavy aircraft, etc; In terms of power, there are electric motor drive, piston engine drive, turbojet engine drive, solar energy drive (also driven by electric motor eventually), etc.

這些模型對結構材料提出的要求都有差別。例如，與由電機驅動的航模不同，采用活塞發(fā)動機驅動的航模須考慮諧振及發(fā)動機安裝等問題，對結構材料抗震性能的要求較高，發(fā)動機的固定也要進行額外的加強處理，需配套安裝包括諧振管、油箱等一系列組件。

These models have different requirements for structural materials. For example, unlike the aircraft model driven by the motor, the aircraft model driven by the piston engine must consider the problems of resonance and engine installation. The requirements for the seismic performance of the structural materials are high. The fixing of the engine also needs to be strengthened. A series of components including resonance tube, oil tank and so on need to be installed.

有些模型為了保證可靠性，甚會在關鍵部位安裝角鋁、角鐵等進行加強。對于一些模型滑翔機，減輕結構重量的要求更突出。為使滑翔距離更遠、下墜速率更低，在結構強度允許的情況下，應盡量降低結構重量，如有些模型的機翼僅保留維持翼型和位置的少量支撐件。更多相關內容就來我們網站http://zaiguo.cn咨詢吧！

In order to ensure reliability, some models will even install angle aluminum and angle iron at key parts to strengthen. For some model gliders, the requirement of reducing structural weight is more prominent. In order to make the glide distance longer and the fall rate lower, the structural weight should be reduced as much as possible if the structural strength allows. For example, the wing of some models only retains a small number of supports to maintain the airfoil and the center of gravity position. Come to our website for more relevant content http://zaiguo.cn Ask!