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| Cross Country http://www.rcsail.com/forum/viewtopic.php?f=3&t=513 |
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| Author: | Stanley [ Mon Jul 11, 2005 7:10 pm ] |
| Post subject: | Cross Country |
上星期有機友說最近在鯉魚門上空見到有隻頗大隻的scale glider 由魔鬼山飛出去過鯉魚門到港島那邊再飛回。嘩！如果 |
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| Author: | Y C Lui [ Mon Jul 11, 2005 9:15 pm ] |
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興趣我估好多人有﹐ Stanley 不如你帶頭搞啦﹗我覺得越野飛行既條件未必一定要沿途可以搵到山坡升力﹐因為山坡升力好受地形影響﹐兼且托得隻機高極有限。我地係山坡上可以飛到隻機一粒骰咁細好多時都係因為熱氣流。我前個星期去海豐既獅山飛傘﹐果度個山對正南中國海﹐個日風向正兼風力夠﹐但由於地形麻麻﹐我地幾把傘飛極都高唔過山脊好多﹐教練教其中一把傘追著D雲黎飛﹐因為雲係由上昇熱氣流做成﹐雲下面一定有上昇氣流﹐結果個把傘過一陣就高到入雲﹐我地仲係山坡面死磨爛磨都無料到。尋日同D傘佬去大亞灣既小鷹嘴飛有同樣情況﹐我貼山飛囉盡山坡 lift 都頂龍只可以高過山脊幾十米。但突然間聽到高度表狂叫﹐我就遠離山坡都升得好快﹐升力無處不在。 跟著教練話我聽我俾頭頂舊黑雲吸緊上去﹐叫我快D降低高度。否則入雲就好大鑊。舊年我去維京賽有個德國佬同我講飛 F3F 都要睇熱氣流﹐因為只要有熱氣流﹐無風都可以飛到 fit fit 聲﹐我問佢點知有無熱氣流﹐佢就指著一片飄緊埋岸邊﹐好細既白雲﹐話D熱氣流就係果度﹐當時我唔明佢講也﹐依家先至知點解。 越野飛行另外一個重要元素就係要順風飛。呢排飛傘同班傘佬接觸多左﹐佢地話我聽係石澳飛落沙灘其實唔係一定得﹐一般秋冬季節吹東北風就無問題﹐因為落沙灘個方向係順風﹐但如果夏天吹東南風﹐佢地就未必落到﹐因為係有小小逆風。尋日同班傘佬去大亞灣飛﹐佢地又玩越野(應該係話越洋)﹐係飛行場先囉夠高度﹐然後越過幾公里既海面降落對面馬頭﹐航線一定要順風。途中仲要搵幾個 check point. 用 GPS 同高度表睇下高度有無損失過度﹐一覺得唔掂就要返轉頭。 |
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| Author: | Ah Pong [ Wed Jul 13, 2005 8:02 pm ] |
| Post subject: | |
Hi Stanley, I think most of the key players are interested in making this meaningful event sucess, and are waiting you to take the lead ( I am one of them)! Crossing the harbour might be not suitable for the first attemp, but flying from FNS to MOS is very attactive. Some points might be taken into consideration. First, the glider shall be thermal flyable, and big (3 meters or above), equipped with PCM receiver that set with fail-safe. A team of good players is a must ( I am not!!). Some sort of pre-event measurements on the gliding ratio to determine the route. I am not sure whether any device could tell the co-ordinator for the height of the glider so as to calculate the sinking rate. GPS might also be considered. Just my 2 cents, and I am always willing to be the runner ( you guys know I am good in hiking, but not flying) Any other comments?? Pong |
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| Author: | Stanley [ Wed Jul 13, 2005 9:45 pm ] |
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[quote]Hi, 做 |
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| Author: | Ah Pong [ Wed Jul 13, 2005 10:57 pm ] |
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Hi Stanley, Pardon me. As pointed out by YC, we shall aim for thermal but not slop's lift. As the old men said, "no pain, no gain". Despite the hot weather, I opin that we should try during summer. Regards, Pong. |
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| Author: | Stanley [ Thu Jul 14, 2005 12:03 am ] |
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I am not saying that we are not aiming for thermals. I think we need both. Slope lift for launching the glider and seek thermal to jump to the next handover point. In fact, you can find in the planned route that some routes do not have slope and we have to find a way to fly over these areas and seeking for thermals is definetely a possibility. Any idea how should we carry this plan? |
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| Author: | Willy Lim [ Thu Jul 14, 2005 3:48 pm ] |
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搵架電動滑翔機試啦。 山坡擲機，博捉到 thermal 滯空，10次都唔知有冇3次成功。 用架電機較保險。 |
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| Author: | Y C Lui [ Thu Jul 14, 2005 9:25 pm ] |
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我覺得由馬鞍山飛去飛鵝山可能會易D﹐因為係順風。我計過條數﹐順風同逆風既高度損失如下﹕ 假設﹕ 飛機空速( airspeed ): 40 km/hr 風速﹕ 25 km/hr 滑降比 ( glide ratio ) : 15 航線同風向既夾角﹕ 45度 航程﹕ 2.4 km 順風飛﹕跌 111m, 飛行時間 2.5 min 逆風飛﹕跌 289m, 飛行時間 6.5 min 可以見到逆風飛既高度損耗係勁好多﹐除非起點高過終點好多﹐否則順風飛係有著數。我研究過呢條航線﹐玩滑翔傘越野應該都 OK ﹐可惜我飛傘技術未到家﹐如果唔係就可以同隻機一齊飛﹐起碼地面D人搵隻機係邊都易D。 
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| Author: | Stanley [ Fri Jul 22, 2005 11:23 pm ] |
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Y.C., 我覺得你嘅提議幾好，不如揾日天氣冇咁熱和吹東風時上馬鞍山試吓。初步我哋可以三四個人作輪流交替式接控飛行，一個機師負責飛行時在上空盤旋，另一位機師就行山到下一個接棒點，當一切準備就緒時就把飛機飛過去。 |
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| Author: | Stanley [ Mon Nov 24, 2008 11:24 pm ] |
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重提舊事。上星期六晚BBQ時有機友話好有興趣重搞番個Cross Country飛行的活動，如果佢無飲醉的話，而人手又足夠的話，搞個由飛鵝山飛去馬鞍山的接力飛行壯舉真是富挑戰性。 我估計至少要有4個接力點，每個點要有兩名機手，還要步行上山探位，選擇視野清色適合的接力位置，人手方面起碼要有10個人以上才可！現在玩滑翔機的人買少見少，搞比賽都唔夠人參賽，點搞呀！ 各位有何意見？ |
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| Author: | Angus [ Tue Nov 25, 2008 12:25 am ] |
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I'll join. I think the 4m Thermik is good choice. |
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| Author: | Ah Pong [ Tue Nov 25, 2008 12:30 pm ] |
| Post subject: | |
Angus, do you have it ?? 
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| Author: | Yeung [ Tue Nov 25, 2008 12:49 pm ] |
| Post subject: | |
Geroge has already maidened his 5m Thermik XXXL. It has been sleeping in his hanger for a year. He will be interested in this activity. http://www.rcsail.com/forum/viewtopic.p ... 7318467577 |
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| Author: | Ah Pong [ Tue Nov 25, 2008 6:28 pm ] |
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Glad to know someone is having it. However, some questions from me: Whether Geroge is willing to use his model ( I think so ) What RC system is he using? JR or Futxxx ? How many channel are needed? Since we need four to five controls with identical setting, we have to figure out these issues first. Pong |
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| Author: | Angus [ Tue Nov 25, 2008 9:47 pm ] |
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Would someone ask George? For radio, it is easier to have a collection of 5 Futaba transmitters but JR radio provides longer range. I think both Futaba 9C or JR 9XII are sufficient. In order to land easily, shall we change the flight path from FNS to MOS instead? I don't mind take the mid-way position. BTW, can we apply Guinness World Records? |
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| Author: | Stanley [ Tue Nov 25, 2008 10:09 pm ] |
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I also suggested the flight path from FNS to MOS not only just for easy landing. The height of FNS is 500m and the height of MOS is only 340m, so there will be some help if we take off from FNS. We can choose a day with southeasterly wind in order to minimize head wind. We need to survey some hand-over points in the flight path first before making the final attempt. Few years ago, we did try to do a hand-over between FNS and 大東山 using two FM transmiters. The distance between these two points however is rather short, so it is easy because it is within ordinary eye sight. I think we better use PCM transmitters because of the fall safe function, last time when we switched transmitters, the plane lost control momentary for one or two seconds, it wasn't a big problem since we got sufficient height. From the planned flight path, I think we need at least three hand-over points, one is in 大東山, one is in 芙蓉別， and one in the unnamed mountain top near 麥理浩徑 as inidicated in the flight path diagram shown above. Can we go up to these points for checking the flight path and trying to fly a model glider there to confirm the location first? In one Sunday, we may start to walk to 芙蓉別 from FNS and then walk along the flight path to MOS and fly our gliders in the planned locations to confirm the possibility. Should we form a team, choose one Sunday and get it moves? By the way, can we install a camera on board the 4m Thermik to record the whole event? |
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| Author: | CM Cheng [ Tue Nov 25, 2008 10:31 pm ] |
| Post subject: | |
I can provide the camera. I have a DV which has an external weather proof camera. It uses SD for storage and is very light. 
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| Author: | King [ Wed Nov 26, 2008 7:55 am ] |
| Post subject: | .. |
| I will suggest you put three little LED flash light (1 red, 2 white) underneath the sailplane for easy reference.
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| Author: | GEORGE [ Wed Nov 26, 2008 11:40 am ] |
| Post subject: | Re: .. |
嘩!! 無上兩日就搞單大野， 有得玩梗要預埋我，隻機有10個SERVOS我裝左套14MZ不過Spoilers同Flap可以試下改用Ｔ插變為8CH,搞掂隻機後還有很多細節要安排同測試，定個日期上馬鞍SET 好隻機再傾下餘下安排ＯＫ？ |
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| Author: | Yeung [ Wed Nov 26, 2008 12:32 pm ] |
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亞堅你套12 channel 可以同George 溝通到 
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| Author: | K.Y.Mak [ Wed Nov 26, 2008 1:55 pm ] |
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將啲 landing 至用嘅 servo 轉去 ch.10, 11,12 咁9仔都可以飛到
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| Author: | Angus [ Wed Nov 26, 2008 11:17 pm ] |
| Post subject: | |
阿楊,我哋個新10仔適用啦 
一於東風上馬鞍山試機 
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| Author: | Yeung [ Thu Nov 27, 2008 12:06 am ] |
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But I think George is using G3 2048 PCM receiver 
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