各位，有些飛場如良景，你們覺得那一種斜坡方向定義比較適合(A, B or C)？有共識後我們以此作為以後定base方向和位置的依據。
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| 設定F3F航道方向的意見 http://rcsail.com/forum/viewtopic.php?f=2&t=2303 |
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| Author: | CM Cheng [ Mon Nov 26, 2012 9:56 am ] | ||
| Post subject: | 設定F3F航道方向的意見 | ||
各位，有些飛場如良景，你們覺得那一種斜坡方向定義比較適合(A, B or C)？有共識後我們以此作為以後定base方向和位置的依據。
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| Author: | K.Y.Mak [ Mon Nov 26, 2012 10:33 am ] |
| Post subject: | Re: 設定F3F航道方向的意見 |
模型机手多以個人主觀感覺飛行. 我選比較人性化的 "B" |
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| Author: | Kolosun [ Mon Nov 26, 2012 10:39 am ] |
| Post subject: | Re: 設定F3F航道方向的意見 |
Me too "B" |
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| Author: | Yeung [ Mon Nov 26, 2012 11:09 am ] |
| Post subject: | Re: 設定F3F航道方向的意見 |
用Ｂ方案時量100米好似要多些工作喎? |
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| Author: | donny [ Mon Nov 26, 2012 11:29 am ] |
| Post subject: | Re: 設定F3F航道方向的意見 |
個人愚見認為, A和C是沒有分別的. 正如麥兄所言, 大多數機手都以個人主觀感覺來判斷point 位, 距離感愈準, 飛行距離就愈短, 準確過point, 時間就愈快,這就成 了致勝的關鍵. 但如果採取A(或C)的話, 比方:向左斜15度, 那機手如何判斷出這15度呢? 在這時候便只好聽聲轉彎了, 如是者便會大大減低了F3F的技術性. A(或C)還有一弊處, 就是飛機很容易入了安全線而造成被扣分, 甚至對線審造成危險. 所以個人認為, (B)是較為恰當的. |
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| Author: | CM Cheng [ Mon Nov 26, 2012 11:33 am ] |
| Post subject: | Re: 設定F3F航道方向的意見 |
Yeung wrote: 用Ｂ方案時量100米好似要多些工作喎? 數學上唔難計嘅 . . .  大家有無留意我們以前測距無考慮高低？用什麼工具測量垂直角度呢？（水平我們用指南針） |
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| Author: | Wing [ Mon Nov 26, 2012 11:34 am ] |
| Post subject: | Re: 設定F3F航道方向的意見 |
Yeung wrote: 用Ｂ方案時量100米好似要多些工作喎? Good point  If the laser measurement of A / B point = 100M, then the flying track of "方案Ｂ" will be less then 100M which imply not compliant with the FAI standard  BTW, any guidelines from FAI or good lessons from international contest if "方案A" vs "方案Ｂ" should be the reference practice to consider ? |
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| Author: | CM Cheng [ Mon Nov 26, 2012 11:46 am ] | ||
| Post subject: | Re: 設定F3F航道方向的意見 | ||
1, Define N 2, Set Base A 3, Measure a and A 4, Calculate A' 4, Measure b 5, Calculate B 6, Set Base B  Assumed level ground. 
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| Author: | Albert [ Mon Nov 26, 2012 1:09 pm ] |
| Post subject: | Re: 設定F3F航道方向的意見 |
B 方案對機手會比較易判斷 point 位。飛機飛出些，飛入些都沒有影響距離感。 |
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| Author: | Wing [ Mon Nov 26, 2012 2:30 pm ] |
| Post subject: | Re: 設定F3F航道方向的意見 |
See if can simply the set up like this : 1. Set up Base A 2. Use laser measurement (or similar precision tools) to judge the distance Base B for exactly 100m 3. Consider the virtual line linking up Base A & Base B as the "Baseline" check the exact orientation angle 4. Install the reference flags for Base A & Base B, with orientation both needs to perpendicular (i.e. 90 degrees) with respect to the "Baseline" * In other words, the measurement of orientation will make reference to the "Baseline" and NOT x degree E nor y degree NE etc 5. In such case, the flying course theoretically should comfort to 100m; and the inclination of the "Baseline" with respect to pilot's feeling on the slope can be determined or re-aligned by calibrating the physical position of Base A & Base B |
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| Author: | K.Y.Mak [ Mon Nov 26, 2012 4:02 pm ] |
| Post subject: | Re: 設定F3F航道方向的意見 |
Why not make it simple, and use GPS to mark the base point location ? GPS signal in open area (on the mountain) is more accurate. We can measure the GPS results against that of a laser device on a level ground. If they confirm, than GPS results can be used. |
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| Author: | CM Cheng [ Mon Nov 26, 2012 4:13 pm ] |
| Post subject: | Re: 設定F3F航道方向的意見 |
The error of GPS is too large for the 100m course. |
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| Author: | CM Cheng [ Mon Nov 26, 2012 4:20 pm ] |
| Post subject: | Re: 設定F3F航道方向的意見 |
如果大家覺得（B）好啲，咁就易辦！下次上山，大家係機師位同意一個面向嘅方向，用指南針測量並記錄，Set A B時就用指南針定方向就可以。 至如測距係第二個問題，亦唔難解決。 |
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| Author: | K.Y.Mak [ Mon Nov 26, 2012 5:28 pm ] |
| Post subject: | Re: 設定F3F航道方向的意見 |
CM Cheng wrote: The error of GPS is too large for the 100m course. 你地成日都話 GPS 唔準, 其實有無試過o架 ? 大家都知 GPS 嘅 absolute positioning 有誤差. 10m ? 20m ? 但我們量度距離,只需要 relative positioning 準確便可. i.e. 跑手由 0m 跑至 100m 與 由 20m 跑至 120m 是沒有分別的 ! 點都好啦, 等個天停雨, 等我用 "GPS"同"拉尺"量度,比較吓就知啦! |
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| Author: | CM Cheng [ Mon Nov 26, 2012 7:47 pm ] |
| Post subject: | Re: 設定F3F航道方向的意見 |
阿麥，如果GPS測距OK就唔買Laser喇，GPS平Laser好多！ 快啲試！！ 
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| Author: | K.Y.Mak [ Mon Nov 26, 2012 9:06 pm ] |
| Post subject: | Re: 設定F3F航道方向的意見 |
頭先出去量尺, 皮尺 100m = 手机GPS 97.6m 我下次試吓部正式o既 GPS (可同時對7粒星), 睇吓會唔會準o的
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| Author: | Albert [ Tue Nov 27, 2012 12:04 am ] |
| Post subject: | Re: 設定F3F航道方向的意見 |
民用GPS 定位, 好似正負一米... 會唔會唔夠準? |
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| Author: | Albert [ Tue Nov 27, 2012 12:06 am ] |
| Post subject: | Re: 設定F3F航道方向的意見 |
另... Android 手機有APPS 叫 Smart Compass, 可以用鏡頭望住兩支旗竿睇 "指南針", 超好用! |
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| Author: | Angus [ Tue Nov 27, 2012 12:44 am ] |
| Post subject: | Re: 設定F3F航道方向的意見 |
最好每次比賽用A，B，C不同方法至有新挑戰。香港飛場實在不多，如果每個場地只有ㄧ個固定設法，我們只會記住場地的轉彎點而失去新場地的適應能力，出外比賽會大為不利。 阿拔，民用GPS誤差好大，做唔到1m。 |
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| Author: | Stanley [ Tue Nov 27, 2012 1:27 am ] |
| Post subject: | Re: 設定F3F航道方向的意見 |
適應新場是去適應不同的地形、風速、風向、上升氣流，並非去適應枝杆set到嗎嗎斜斜。試問如果無一個標準，set到斜到無輪，跟本就飛唔到。國際賽set場都以賽道直線向外拉直角90度為準側的。 
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| Author: | Stanley [ Tue Nov 27, 2012 2:04 am ] |
| Post subject: | Re: 設定F3F航道方向的意見 |
我個人愚見認為A和C都並不理想，因為桿的角度與主斜坡面不是直角，但B的方案亦未算最理想，因為base b 地形突出，為兔panalty入了base b後，大家一定要飛得好出，事實上過去好多飛友都不知不覺飛入攞咗panalty。如果能夠將base b向內移入十多尺，base judge座後少少，問題就可以解決，飛友可選擇飛高D或飛出D都可以，唔撞山就得。 |
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| Author: | K.Y.Mak [ Tue Nov 27, 2012 10:27 am ] |
| Post subject: | Re: 設定F3F航道方向的意見 |
 另外話題 : 萬事以安全為上呀 ! 我都唔知點解成日都有人,把個base judge 放到支棋咁近 ? 開港都有話 "君子不立危牆之下". 上次比賽我去坐 B點時,見佢地坐到好近支棋, 我都立刻把個 judge 位拉後至行人路邊. 果度重有棵樹可以檔住由A點剎過嘅飛机. 安全好多o架! 我建議日後set位時, 支棋有咁出、放咁出, 人就有咁入、收咁入
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