Why is the J-35 prototype painted in ‘green skin’? This is closely tied to standard practices in aerospace development. The term ‘green skin aircraft’ refers to prototypes or early test aircraft coated only with a green primer—typically an epoxy zinc chromate anti-corrosion base coat—without the final tactical paint scheme. This approach is common in both domestic and international military aircraft programs.Firstly, the green primer primarily protects the aircraft’s metal airframe from oxidation and corrosion during prolonged ground tests and initial flight trials, especially critical in coastal or high-humidity environments. Secondly, during the testing phase, the aircraft undergoes frequent disassembly, inspection, and modifications. Applying a full finish paint would be costly and easily damaged during these adjustments, leading to unnecessary waste. Moreover, the green primer offers excellent adhesion, making it ideal for subsequent application of operational camouflage.Importantly, the ‘green skin’ does not indicate inferior capability or outdated technology; rather, it signifies that the aircraft is in a crucial engineering validation phase. As flight testing progresses, the J-35 will eventually receive low-visibility gray or other mission-specific paint schemes before entering formal service and mass production. Thus, the ‘green skin’ is a hallmark of a next-generation fighter’s developmental journey and reflects the rigorous discipline of modern aviation engineering.
歼-35试飞机为何采用“绿皮”涂装？这其实与航空工业中的标准试飞流程密切相关。所谓“绿皮机”，是指在原型机或早期试飞阶段，飞机表面仅喷涂一层具有防腐蚀功能的绿色底漆（通常为环氧锌黄底漆），而未进行最终的战术涂装。这种做法在国内外军用飞机研发中十分常见。首先，绿色底漆主要作用是保护机体金属结构在长时间地面测试和初期飞行中免受氧化和腐蚀，尤其在沿海或高湿环境中尤为重要。其次，在试飞阶段，飞机还需频繁拆装、检测和改装，若喷涂完整面漆，不仅成本高，而且每次改动都会破坏外观，造成资源浪费。此外，绿色底漆具有良好的附着力，便于后续喷涂正式涂装。值得注意的是，“绿皮”并不代表性能或技术落后，反而说明该机正处于关键的工程验证阶段。随着试飞任务推进，歼-35将逐步换上低可视度灰色或其他作战涂装，进入定型和量产阶段。因此，“绿皮机”是先进战机诞生前的“成长印记”，也是航空研发严谨流程的体现。
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