{"url":"https://enerupu.hatenadiary.org/entry/20120223/1330026473","version":"1.0","provider_url":"https://hatena.blog","published":"2012-02-23 04:47:53","blog_url":"https://enerupu.hatenadiary.org/","width":"100%","blog_title":"\u3082\u30fc\u306b\u3093\u3050\u3050\u308d\u30fc\u308a\u30fc","image_url":"https://cdn-ak.f.st-hatena.com/images/fotolife/e/enerupu/20120224/20120224030647.jpg","author_name":"enerupu","categories":["\u6c34\u30ed\u30b1\u30c3\u30c8\uff08water rocket\uff09"],"type":"rich","html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fenerupu.hatenadiary.org%2Fentry%2F20120223%2F1330026473\" title=\"\uff18\uff0e\u30d1\u30e9\u30b7\u30e5\u30fc\u30c8\u56de\u53ce\u306b\u5411\u3051\u3066 - \u3082\u30fc\u306b\u3093\u3050\u3050\u308d\u30fc\u308a\u30fc\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","title":"\uff18\uff0e\u30d1\u30e9\u30b7\u30e5\u30fc\u30c8\u56de\u53ce\u306b\u5411\u3051\u3066","author_url":"https://blog.hatena.ne.jp/enerupu/","height":"190","provider_name":"Hatena Blog","description":"\u6700\u8fd1\u3084\u306a\u3053\u3068\u3070\u3063\u304b\u308a\u3067\u3059\u3002 \u3044\u3044\u3053\u3068\u306a\u3044\u304b\u306a\u30fc\u3002\u672c\u683c\u7684\u306a\u30d1\u30e9\u30b7\u30e5\u30fc\u30c8\u56de\u53ce\u306b\u3080\u3051\u3066\u3061\u3083\u3093\u3068\u843d\u4e0b\u901f\u5ea6\u3092\u8a08\u7b97\u3057\u3066\u307f\u307e\u3057\u305f\u3002 \uff2e\uff21\uff33\uff21\u306e\u30e2\u30c7\u30eb\u30ed\u30b1\u30c3\u30c8\u306e\u8cc7\u6599\u304c\u843d\u3061\u3066\u3044\u305f\u306e\u3067\u3001\u53c2\u8003\u306b\u3057\u307e\u3057\u305f\u3002drag coefficient of parachute\uff1aCd=1.75 air density : r=1.229kg/cube m \u3068\u3057\u3066\u3001\u8a08\u7b97\u3002\u30d1\u30e9\u30b7\u30e5\u30fc\u30c8\u9762\u7a4d\u306f\u3001\u4eca\u56de\u306f\u516b\u89d2\u5f62\u306b\u3057\u305f\u3064\u3082\u308a\u3060\u3063\u305f\u306e\u3067\u3059\u304c\u3001\u5186\u307d\u304b\u3063\u305f\u306e\u3067\u3001A=\u03c0R^2 R=240mm\u7dcfWeight=154\uff47 \u306a\u306e\u3067recovery\u4e2d\u306f\u3001Drag=Weight\u3088\u3063\u3066\u901f\u5ea6\u306f\u3001\u3068\u306a\u308a\u3001\u9014\u4e2d\u8a08\u7b97\u5c11\u3057\u3089\u304f\u306b\u3059\u308b\u3068\u3001 0.43m/s = 1.5km/h\u305f\u2026"}