在航空模型制作領域，材質選擇猶如交響樂中的樂器編配，既需要遵循科學原理，又要展現藝術創造力。從傳統木材到現代復合材料，每種材質都是工程師與自然對話的媒介，承載著將設計藍圖轉化為飛行藝術的使命。

　　In the field of aviation model making, material selection is like the arrangement of musical instruments in a symphony, which requires both adherence to scientific principles and artistic creativity. From traditional wood to modern composite materials, each material is a medium for engineers to communicate with nature, carrying the mission of transforming design blueprints into flying art.

　　木質樂章：自然賦予的飛行基因

　　Wooden Symphony: The Flying Gene Endowed by Nature

　　木材作為航空模型的元老級材質，至今仍在專業領域占據重要地位。輕木以0.15-0.36g/cm3的密度成為翼肋制作的優選，其獨特的細胞結構在減輕重量的同時，仍能保持足夠的抗剪強度。在競速機翼梁設計中，東北紅松展現出驚人的力學性能，這種木質纖維沿順紋方向排列的木材，其抗拉強度可達木材平均值的1.8倍，成為承受飛行載荷的關鍵結構件。

　　Wood, as a veteran material for aviation models, still holds an important position in the professional field. Light wood at 0.15-0.36g/cm3 The density has become the preferred choice for wing rib production, and its unique cell structure can reduce weight while still maintaining sufficient shear strength. In the design of racing wing beams, Northeast Korean pine exhibits amazing mechanical properties. This type of wood fiber arranged along the grain direction has a tensile strength that can reach 1.8 times the average value of wood, making it a key structural component that can withstand flight loads.

　　桐木與輕木構成蒙皮材料的黃金組合，前者0.2-0.4g/cm3的密度與后者的超輕特性形成完美互補。在制作像真機模型時，椴木層板通過0.5-3mm的厚度變化，既能實現機身曲面的精確造型，又可保證結構強度。這種自然材料的溫度適應性更令人驚嘆，某型實木模型在-20℃至40℃環境中，仍能保持90%以上的原始抗彎剛度。

　　The golden combination of paulownia and light wood for skin material, with the former ranging from 0.2-0.4g/cm3 The density of the latter perfectly complements its ultra lightweight characteristics. When making a model resembling a real machine, the basswood layer board can achieve precise shaping of the body surface and ensure structural strength through a thickness variation of 0.5-3mm. The temperature adaptability of this natural material is even more amazing. A certain type of solid wood model can still maintain over 90% of its original bending stiffness in an environment of -20 ℃ to 40 ℃.

　　泡沫革命：輕盈之舞的現代詮釋

　　Foam Revolution: Modern Interpretation of Light Dance

　　聚苯乙烯泡沫板（KT板）以0.02-0.03g/cm3的密度，將模型制作帶入全民航空時代。這種材料在熱絲切割下可實現毫米級精度，某教育機構用KT板制作的太陽能無人機，機翼厚度誤差控制在±0.2mm以內，完美驗證了空氣動力學設計。更令人稱奇的是其表面處理潛力，EPO泡沫通過化學發泡工藝，表面粗糙度可達Ra0.8，直接噴漆后的光澤度可媲美注塑件。

　　Polystyrene foam board (KT board) with 0.02-0.03g/cm3 The density brings model making into the era of national aviation. This material can achieve millimeter level accuracy under hot wire cutting. A solar unmanned aerial vehicle made of KT board by an educational institution has a wing thickness error controlled within ± 0.2mm, perfectly verifying the aerodynamic design. What is more amazing is its surface treatment potential. EPO foam has a surface roughness of Ra0.8 through the chemical foaming process, and the gloss after direct painting is comparable to that of injection molded parts.

　　發泡聚丙烯（EPP）在3D特技機領域創造奇跡，其獨特的蜂窩狀結構可吸收70%以上的沖擊能量。某特技飛行隊在測試中，EPP機翼在30米高度墜落試驗后，僅產生0.5mm的永久變形，遠低于傳統木結構的5mm形變量。這種材料在-40℃低溫下仍能保持85%的沖擊強度，成為極地科考模型的首選。

　　Expanded polypropylene (EPP) has created a miracle in the field of 3D stunt machines, with its unique honeycomb structure capable of absorbing over 70% of impact energy. During testing, a certain aerobatic team found that the EPP wing only produced a permanent deformation of 0.5mm after a 30 meter drop test, which is much lower than the 5mm deformation of traditional wooden structures. This material can maintain 85% impact strength at low temperatures of -40 ℃, making it the preferred choice for polar research models.

　　復合材料：未來飛行的先聲

　　Composite materials: the prelude to future flight

　　碳纖維增強塑料（CFRP）將模型制作推向新高度，其比強度達到鋼材的5倍，比模量更是鋁合金的3倍。在某型競速機設計中，采用CFRP蒙皮的機翼重量減輕60%，扭轉剛度卻提升2.3倍，使滾轉速率突破300°/秒大關。更令人驚嘆的是其疲勞性能，經過10萬次循環加載后，強度保持率仍達92%。

　　Carbon fiber reinforced plastic (CFRP) has pushed model making to new heights, with a specific strength of 5 times that of steel and a specific modulus of 3 times that of aluminum alloy. In the design of a certain type of racing aircraft, the wing weight is reduced by 60% using CFRP skin, while the torsional stiffness is increased by 2.3 times, resulting in a roll rate exceeding the 300 °/s threshold. Even more astonishing is its fatigue performance, with a strength retention rate of 92% even after 100000 cycles of loading.

　　玻璃纖維（GFRP）在海洋環境模型中大放異彩，其耐鹽霧性能通過ASTM B117標準4000小時測試，表面僅出現0.3%的銹蝕面積。某水上飛機模型采用GFRP船體，在淡水環境中浸泡2年后，吸水率仍控制在0.5%以下，遠優于傳統木質結構的15%吸水率。

　　Glass fiber reinforced plastic (GFRP) shines in marine environmental models, with its salt spray resistance tested for 4000 hours according to ASTM B117 standard, and only 0.3% of the surface area shows corrosion. A certain seaplane model adopts GFRP hull, and after soaking in freshwater environment for 2 years, the water absorption rate is still controlled below 0.5%, far better than the traditional wooden structure's 15% water absorption rate.

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