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PostPosted: 10 Jun 2004 06:38 pm 

Joined: 15 May 2004 10:48 pm
Posts: 29
各位師父:

請問低尾,中尾,高尾和V尾機有什麼不同呢??? 但見好多人用V尾機, 係快d定其他原因呢???

:oops:


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PostPosted: 10 Jun 2004 07:31 pm 
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Joined: 26 Feb 2004 05:31 pm
Posts: 741
Location: 沙田
低/中十字尾係一般佈局﹐係呢度作為對照佈局。

V 尾﹕比起同樣效應既十字尾﹐V尾既尾翼面積較細﹐所以條尾可以輕D﹐仲有個好處係落地個陣尾翼唔會咁易揩到D草。但V尾唔好在俾 rudder 個陣會 couple 埋個 aileron.同時間俾多D rudder 同 elevator 個陣一邊控制面好多時都會唔夠行。依加咁多機用V尾既原因多數係因為V尾睇落靚仔﹐high-tech。但最近潮流已經轉左﹐好多名種賽機好似 NYX 同 Pike咁都紛紛轉用十字尾﹐用係山坡機上﹐V 尾同十字尾既分別幾乎係零

T 尾 (高尾) : 多見於真滑翔機﹐作用係令尾翼遠離主翼產生既下衝氣流 (down wash)﹐令俯仰控制可以穩定D﹐但由於垂直尾翼要支撐水平尾翼既重量同運動慣性﹐一定要做得夠紮實﹐即係話尾部既重量會較高﹐所以 T 尾極小被用于純講性能既模型滑翔機上。降落如果太重手﹐T 尾機好多時機尾都會係垂直尾翼既前面折斷。

最後﹐我唔係師傅﹐以上講既全係理論﹐只可以作為參考﹐實際分別最好都係自己去感受下。


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PostPosted: 10 Jun 2004 08:46 pm 

Joined: 15 May 2004 10:48 pm
Posts: 29
教到我已經係師父啦!!! ANYWAY, Thanks a lot!!!

:lol:


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PostPosted: 11 Jun 2004 12:57 am 
David Law wrote:
各位師父:

請問低尾,中尾,高尾和V尾機有什麼不同呢??? 但見好多人用V尾機, 係快d定其他原因呢???

:oops:
http://home.kimo.com.tw/iamo8/我諗你睇睇以上個綱址都可能對你有D幫助。


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PostPosted: 15 Jun 2004 08:59 am 
Don't waste time to answer this guy, :P
Ask question is his hobby. :twisted:


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 Post subject:
PostPosted: 15 Jun 2004 05:09 pm 
小弟飛了不太多時間,想問各位師兄關於有些机種同時有Aileron及rudder做turn,什麼時候用那一種,而我在書上看過可以一齊運用來做turn,這又有什麼好處,比起T tail是否優勝呢?請多多指教。


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 Post subject: Using rudder in Flying
PostPosted: 15 Jun 2004 05:55 pm 
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Joined: 26 Feb 2004 10:38 pm
Posts: 7
Dear fellow pilots,

http://www.polecataero.com/articles/rudder/

this web page was written by Mark Drela, it is a very illustrative and interesting review telling how to use rudder and aileron to make a tight turn, in thermal flight.

In summary, it helps to maintain a tight turn with little sideslip. From my limited experience, it works for planes other than thermal ones too. This technique can reduce the amount of "tip stall" in planes designed with little or no dihedral build in.


Last edited by foolstop on 15 Jun 2004 07:54 pm, edited 1 time in total.

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 Post subject:
PostPosted: 15 Jun 2004 06:18 pm 
hi foolstop, thanks your posted wedsite, it's very useful and interesting for my reference.


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 Post subject:
PostPosted: 15 Jun 2004 08:52 pm 
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Joined: 26 Feb 2004 05:31 pm
Posts: 741
Location: 沙田
以我非常有限既經驗﹐rudder 係低速﹐頻臨失速既狀態下用黎轉彎會比 aileron 好好多。 Aileron 係呢種情況下通常都無也料到﹐架猛俾多D aileron 又抽 up 贊隻機即刻 lui 落黎。熱氣流機好多時都係處於呢種飛行狀態﹐所以 rudder 既使用率會高過山坡機好多。用 aileron 定 rudder 經常係手擲機高手既討論議題﹐鍾意用 rudder 班人曾經提出過一個理論,就係話俾 aileron 個陣翼形會產生改變﹐令隻翼既升阻比( lift to drag ratio )下降﹐以至損失高度﹐我仲未到個個境界﹐所以唔知有幾真。

隻 Salome DLG 既說明書又話﹐當隻機既 aileron 用左黎做 airbrake 個陣﹐aileron 會無也反應﹐個陣就應該用 rudder 轉彎。

係山坡上﹐rudder 多數係臨降落個陣用﹐首先將隻機插到低位﹐兜兩個圈消耗能量﹐然後順風斜斜地咁沿山坡鏟上黎減速﹐上到黎個陣﹐隻機應該差唔多係橫風﹐機速頗慢﹐趙埋呢草度都無問題﹐但如果要 land 得好D﹐就要令隻機轉向頂風﹐慢慢訓落呢草度﹐轉呢個 90 度彎好多時都要用 rudder 輔助。


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 Post subject:
PostPosted: 16 Jun 2004 04:31 pm 
咁講,V tail 在landing時咪好蝕底,在低速下turn好容易失去升力兼無rudder轉得咁輕鬆,實際又是否這樣呢?


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 Post subject:
PostPosted: 06 Jul 2004 12:40 pm 
里條係勿尾??
http://www.prop.at/kurzber/pic_2004/f3k_oem/Seiten/Wolfgang%20Zach%20mit%20dem%20Turbo-Mercedes.htm


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 Post subject:
PostPosted: 06 Jul 2004 12:54 pm 
Anonymous wrote:

可能要用直昇機CCPM混控先搞得掂里條尾..哈哈 :D


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