Re: [問題] Aileron在起飛加速時的作用?
A.net 原討論串: http://goo.gl/BJ83ZW
mhsieh Reply 12, posted Fri May 14 2010 04:48:51
With takeoff thrust, until reaching 80kts, the flaperons are in BYPASS mode
so they droop all the way down due to gravity, then upon reaching 80kts,
power to actuator is restored and they resume the preset drooped position.
787atPAE Reply 13, posted Fri May 14 2010 07:44:28
The flaperon takeoff bypass is there to reduce the fatigue on those silly
actuators when the thrust right in front of that surface is rather large.
The flaperons will float as the lift on the wing increases.
綜合兩篇回文，整理如下：
在起飛推力下，當空速未達到80節前，襟副翼係處於旁路模式（bypass mode）；是
故，其會因重力自然下垂。隨著速度增加，機翼表面之升力亦增加，則此控制面逐漸
「上浮」至水平位置。當速度達80節時，襟副翼之驅動機構（actuator）重新獲得電
源供應，並將該控制面之角度調整至指定位置。
此機置之目的在於保護驅動機構。因發動機位置即位於襟副翼正前方，故此機置可在
大推力輸出時減少此驅動機構之損耗。
※ 引述《Retsell (Retsell)》之銘言：
: http://www.youtube.com/watch?v=269K7yhRnhw
: 這是魚翅777-300er的影片
: 一開始副翼跟襟翼一樣是在水平的位置
: 然後05:20後 放flaps後 副翼也跟著放了下來
: 但是開始加速到06:04時
: 副翼開始有動作回到了水平的位置
: 但是到了06:19時 副翼又跟著放了下來
: 想請問副翼這段時間做的動作
: 應該不是為了要改變飛機的姿態
: 但到底是為了什麼會有這些動作?
--
春風吹放自由花。崩崩崩崩。
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 61.230.79.183
推
02/13 20:22, , 1F
02/13 20:22, 1F
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777 System Description:
The flaperons droop to 10 deg TED (Trailing Edge Down) when the flaps are at
the 5 position. They droop to 20 deg TED when the flaps are at the 15 or 20
position. They droop to 31 deg TED when the flaps are at the landing position
(25 or 30).
On the ground, the PFCs (Primary Flight Computers) remove the flaperon droop
command in proportion to the speedbrake lever movement from 17 to 55 deg.
When the speedbrake lever goes back to the down position, the flaperons
gradually droop to the position commanded by the flaps.
推
02/13 23:13, , 10F
02/13 23:13, 10F
※ 編輯: ahpc82 來自: 61.230.64.199 (02/14 01:33)
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