請問公路車換刀輪適合嗎?? - 公路車
By Heather
at 2014-04-21T15:46
at 2014-04-21T15:46
Table of Contents
: → WuDhar :我覺得你有物理觀念上的問題,試問兩輕重物體在無阻 04/21 05:41
: → WuDhar :力狀況下「保持」等速度前進需要多少力?答案兩者都 04/21 05:41
: → WuDhar :是零,不受力狀況動者恆等速度移動,故巡航時兩輪只 04/21 05:42
: → WuDhar :是同樣在抵抗風阻罷了。而風阻的概念你也有問題,風 04/21 05:42
: → WuDhar :阻跟流體/形狀/速度有關但跟重量無關,簡單例子,只 04/21 05:42
: → WuDhar :載一個人跟裝滿人的小客車同速度下是一樣的風阻,你 04/21 05:42
: → WuDhar :說的地面阻力是啥不是很清楚,不過一般來說設純滾動 04/21 05:42
: → WuDhar :條件下類似打滑之類的情形都先忽略 04/21 05:43
: → WuDhar :另外如果有100k不用停的平路路線,不要說5kg輪 04/21 07:22
: → WuDhar :我還挑10kg的來用,頂多起步慢一點而已~ 04/21 07:22
地球重力圈內沒有無阻力這回事,重力造成的對地面磨擦力(輪胎)、零件傳動的磨
擦力(齒輪鍊條培林內外胎花轂幅條輪框)都需要列入考量。這還是不考慮車架零件
剛性的部分。
而且如果要討論現實情況,地球上沒有哪條路能連續100公里都不用停還是全平面加直
線又沒風。
以實際情況來看,低重量高剛性低空氣阻力的輪組一直是實務上在挑戰的目標,為什
麼?就是因為沒有哪條路線能符合平坦直線無風這些要求,特別是以台灣來說,多起
伏不平坦又滿是叉路,這三點要能同時滿足才能真正對應,就算能達成要求價格也會
嚇死人。
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公路車
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