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Wednesday, December 16, 2009


You guy sure got play paper plane in ur childhood life is it? yeah~~ everyone do...^^
here's a question for u guys...^^

为什么小时候玩纸飞机要先哈一口气?
A. 吹平机头毛刺,飞得更远
B. 湿润机头,保持平衡
C. 提前加热,减少能量



answer: B. 纸飞机起飞前先哈一口气,和空气动力学有关。纸飞机机头较小,虽然能减少阻力,但又使机头质量过轻、机身质量不平均。先哈一口气,湿润后的飞机头稍重一些,能够使机身整体保持平衡,这样飞机才能在空中飞行较长时间。此外,机头稍重能起到带动作用,如果机身后部质量过重,纸飞机在飞行过程中则容易后翻。

i found it so interesting so i post it here..XD

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