🏹 箭速计算器（由 IBO 速度估算实际箭速和动能）Arrow Speed Calculator (Real Speed & Kinetic Energy from IBO)
用常见的经验规则，从复合弓的 IBO 额定速度、拉距、拉力、箭重和弦上附加物重量估算实际箭速，并给出动能（ft·lb、J）、动量和适合的狩猎等级参考。也可以直接由箭速和箭重算动能。本地处理。Estimate the real speed of an arrow from a compound bow IBO rating, draw length, draw weight, arrow weight and extra weight on the string with the usual rules of thumb, then get kinetic energy (ft·lb and J), momentum and a rough hunting guide. You can also go straight from a measured speed and arrow weight. Processed locally.
使用说明与常见问题How-to & FAQ
「箭速计算器（由 IBO 速度估算实际箭速和动能）」是什么？What is the Arrow Speed Calculator (Real Speed & Kinetic Energy from IBO) tool?
用常见的经验规则，从复合弓的 IBO 额定速度、拉距、拉力、箭重和弦上附加物重量估算实际箭速，并给出动能（ft·lb、J）、动量和适合的狩猎等级参考。也可以直接由箭速和箭重算动能。本地处理。Estimate the real speed of an arrow from a compound bow IBO rating, draw length, draw weight, arrow weight and extra weight on the string with the usual rules of thumb, then get kinetic energy (ft·lb and J), momentum and a rough hunting guide. You can also go straight from a measured speed and arrow weight. Processed locally.
如何使用「箭速计算器（由 IBO 速度估算实际箭速和动能）」？How do I use the Arrow Speed Calculator (Real Speed & Kinetic Energy from IBO) tool?
在「箭速计算器（由 IBO 速度估算实际箭速和动能）」中，填写「计算方式」、「IBO 速度 fps」、「拉距（英寸）」、「拉力（磅）」、「箭重（grain）」等参数，结果会随输入实时计算并显示在下方。In the Arrow Speed Calculator (Real Speed & Kinetic Energy from IBO): Fill in "Mode", "IBO speed fps", "Draw length (in)", "Draw weight (lb)", "Arrow weight (grains)"; results are recalculated instantly as you type.
IBO 速度是什么？What is the IBO speed?
IBO 是厂商标注的标准测试速度：拉距 30 英寸、拉力 70 磅、箭重 350 grain（每磅 5 grain）。实际配置不同，速度通常更低。IBO is the standard rated speed at a 30 in draw, 70 lb draw weight and a 350-grain arrow (5 grains per pound). Real setups differ and are usually slower.
动能怎么算？How is kinetic energy worked out?
动能 (ft·lb) = 箭重 (grain) × 速度² (fps²) ÷ 450240；1 ft·lb ≈ 1.356 J。动量 = 箭重 × 速度 ÷ 225400 (slug·ft/s)。Kinetic energy (ft·lb) = arrow weight (grains) × speed² (fps²) / 450240; 1 ft·lb is about 1.356 J. Momentum = weight × speed / 225400 in slug·ft/s.
估算准吗？How accurate is the estimate?
这是常用的经验规则，误差可能有 5–10 %。弓的效率、弦、附件都会影响结果，最好用测速仪实测。These are common rules of thumb and can be off by 5–10 %. Bow efficiency, the string and accessories all matter, so a chronograph is best.
能举个计算实例吗？Can you show a worked example?
例如在「箭速计算器（由 IBO 速度估算实际箭速和动能）」中填 计算方式 = 由 IBO 速度估算，IBO 速度 fps = 330，拉距（英寸） = 29，拉力（磅） = 60，箭重（grain） = 400，弦上附加重量（grain） = 10，结果区显示：箭速：283.3 fps；86.4 m/s；动能：71.3 ft·lb；96.7 J；动量：0.503 slug·ft/s；动能参考：最大型猎物；ℹ 规则：拉距每少 1 英寸减 10 fps；箭重每超过“5 grain/磅拉力”3 grain 减 1 fps；弦上每 3 grain 附加物减 1 fps。实际以测速为准。For example, entering Mode = Estimate from IBO rating, IBO speed fps = 330, Draw length (in) = 29, Draw weight (lb) = 60, Arrow weight (grains) = 400, Extra string weight (grains) = 10 in the Arrow Speed Calculator (Real Speed & Kinetic Energy from IBO) gives: Arrow speed: 283.3 fps; 86.4 m/s; Kinetic energy: 71.3 ft·lb; 96.7 J; Momentum: 0.503 slug·ft/s; Energy guide: The largest game; ℹ Rules: subtract 10 fps per inch of draw under 30 in, 1 fps per 3 grains of arrow above 5 grains per pound of draw weight, and 1…
哪些输入会被检查？Which inputs are validated?
「箭速计算器（由 IBO 速度估算实际箭速和动能）」会检查这些输入——「IBO 速度 fps」、「拉距（英寸）」、「拉力（磅）」、「实测箭速 fps」：所选方式用到时必须填写，须大于 0；「箭重（grain）」：必须填写，须大于 0；「弦上附加重量（grain）」：不能为负数；绝对值超过 10¹⁵ 的数也会被拒绝。不符合时结果区显示具体提示，不会给出数字。The Arrow Speed Calculator (Real Speed & Kinetic Energy from IBO) checks its inputs — "IBO speed fps", "Draw length (in)", "Draw weight (lb)", "Measured speed fps": required when the chosen option uses it, must be greater than 0; "Arrow weight (grains)": required, must be greater than 0; "Extra string weight (grains)": cannot be negative; numbers above 10¹⁵ in absolute value are rejected too. When a value fails, the result area names the problem instead of showing a number.
有哪些选项可以调整？What options can I adjust?
「箭速计算器（由 IBO 速度估算实际箭速和动能）」的设置：「计算方式」可选 由 IBO 速度估算、已知箭速（默认 由 IBO 速度估算）；「IBO 速度 fps」默认 330；「拉距（英寸）」默认 29；「拉力（磅）」默认 60；「箭重（grain）」默认 400；「弦上附加重量（grain）」默认 10；「实测箭速 fps」默认 280。每次生成结果都按当前设置处理。Settings in the Arrow Speed Calculator (Real Speed & Kinetic Energy from IBO) — "Mode": Estimate from IBO rating, From measured speed (default Estimate from IBO rating); "IBO speed fps" default 330; "Draw length (in)" default 29; "Draw weight (lb)" default 60; "Arrow weight (grains)" default 400; "Extra string weight (grains)" default 10; "Measured speed fps" default 280. The result always uses the current settings.
手机上能用吗？Does it work on mobile?
可以。「箭速计算器（由 IBO 速度估算实际箭速和动能）」支持触屏操作，在手机和平板浏览器中均可使用，无需安装 App。Yes. The Arrow Speed Calculator (Real Speed & Kinetic Energy from IBO) supports touch input and works in mobile and tablet browsers without installing an app.
「箭速计算器（由 IBO 速度估算实际箭速和动能）」免费吗？需要注册吗？Is the Arrow Speed Calculator (Real Speed & Kinetic Energy from IBO) free? Do I need an account?
「箭速计算器（由 IBO 速度估算实际箭速和动能）」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Arrow Speed Calculator (Real Speed & Kinetic Energy from IBO) is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.