愚笨的悶人無聊地看到吊掛在樓底的風管，
忽發奇想那些彎頭應如何繪畫，如何展開，
在這裡提出討論，望高手們指點一下悶人，
悶人先貼出毫不完整的構思只為發起討論。

隨手拉個曲面
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逐一化為鈑金
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裝配起來
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爆炸圖
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工程圖+展開圖
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悶人來個設變動畫。
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