你想問mixing原理定應用呀﹖
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| Why wing waxing? http://www.rcsail.com/forum/viewtopic.php?f=3&t=320 |
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| Author: | WingDragon [ Thu Nov 25, 2004 11:50 pm ] |
| Post subject: | Why wing waxing? |
Why do people do it? Some say on the top only and some say on both side, what are the difference? Many thanks! |
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| Author: | MingFai [ Fri Nov 26, 2004 1:33 am ] |
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你想問mixing原理定應用呀﹖
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| Author: | dannywong [ Fri Nov 26, 2004 8:54 am ] |
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可能你真係問 waxing 打臘. 咁打完臘, 隻機咪靚仔 D 囉. 同埋, 可以令表面光滑 D, 減低風阻?? |
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| Author: | WingDragon [ Fri Nov 26, 2004 9:06 am ] |
| Post subject: | wing waxing |
Thanks all, I mean waxing, as someone told me before - waxing the wing bottom will decrease the lift of the plane, and waxing the top can increase the lift and speed. Don't know if that's true or not. 
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| Author: | Y C Lui [ Fri Nov 26, 2004 2:37 pm ] |
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打蠟要分翼底翼面我真係第一次聽﹐更加無實際經驗。不過純講理論﹐打蠟會令翼面更光滑﹐不論翼面翼底﹐都可以降低空氣既摩擦阻力﹐提昇速度﹐間接增加升力。 但翼面變得更光滑會影響氣流黏附係機翼表面既能力﹐有可能令機翼提早失速。好多空氣動力學既書都有提到 邊緣層(boundary layer) 呢樣野﹐邊緣層係指貼實翼既表面個層氣流﹐一般都希望係做到呢層空氣係紊流( turbulent flow ) ﹐呢度唔係講失速個陣氣流完全脫離翼面個種大範圍紊流﹐而係好薄好薄既一層紊流﹐再打上就係層流 ( laminar flow ). 邊緣層係紊流既壞處就係增加阻力﹐但好處係令空氣更黐翼面﹐延遲失速﹐有D真飛機既翼前緣裝左一排好似牙既 vortex generators ( http://www.newenergy.org.cn/english/guide/index-9.htm) ﹐目的就係要製做一層翼面紊流﹐延遲失速。同樣既裝置都有用係模型上﹐譬如有D自由飛飛機既翼前緣做到起?#29399;牙?﹐又有D人貼條 zig-zag 形既厚膠紙係翼前緣既上面﹐都係咁既作用。所以如果打蠟真係要揀位﹐就應該唔好打翼面。 翼底唔會有氣流分離現像(反飛除外) ﹐所以係越滑越好﹐無也理由係度打蠟會降低升力。 其實飛機上面好多裝置都只係會對性能帶黎好小改善﹐對一程飛十幾個鐘既長途客機黎講﹐呢D小改善可以節省燃料﹐所以有用﹐但用係我地D模型上﹐作用係好難感覺到。所以我覺得未必需要睇到咁仔細。 |
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| Author: | WingDragon [ Fri Nov 26, 2004 3:07 pm ] |
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Thank you Y C for the detailed explaination on aerodynamic. 
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| Author: | CM Cheng [ Fri Nov 26, 2004 4:11 pm ] |
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唔 ~ 呢個可能係 Stanley 隻舊爛 Sting 飛到咁既快原因 . . .
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