原帖由 CWHS 於 25-7-2010 11:10 發表
CF-18係到做緊個High AOA既 Fly By比觀眾睇, 係下面片中睇到crash前聽到Engine "Pop Pop Pop", 咁有可能遇到FOD或bird strikes, 因為飛緊45度AOA時, 已經接緊失速狀態, 如果引擎出現問題, 而且無足夠高度救機, Pil ...
原帖由 CWHS 於 25-7-2010 11:10 發表
CF-18係到做緊個High AOA既 Fly By比觀眾睇, 係下面片中睇到crash前聽到Engine "Pop Pop Pop", 咁有可能遇到FOD或bird strikes, 因為飛緊45度AOA時, 已經接緊失速狀態, 如果引擎出現問題, 而且無足夠高度救機, Pil ...
原帖由 odyssey2007 於 25-7-2010 11:47 發表
未必係fod, 呢o的咁既aoa 同速度有可能係engine surge/stall
o的咁既高度+ 速度+ aoa 出o的咁既事f 22 都冇得救
原帖由 CWHS 於 25-7-2010 12:07 發表
Ai丫Ai竟然唔記得呢個可能
片中22-26秒係可救機時間26秒之後就byebye lor
而F-22唔好唔記得有Thrust vectoring, 如果只係一邊ENG有事的, Apply Full Thrust加bank番去左邊, Thrust Vectoring + 4秒反應時 ...
原帖由 odyssey2007 於 25-7-2010 12:49 發表
問題係你O係O的咁既AOA 同速度推唔推到full thrust
gas turbine engine 係靠turbine 黎帶compressor 轉, compressor surge/stall 左你combustion camber 都俾唔到咁多output 俾turbine, turbine 唔夠output compr ...
原帖由 odyssey2007 於 25-7-2010 14:17 發表
得番一邊engine 你個thrust to weight ratio 就算係f22 都一定細到...咁既ratio 個envelope 會細左好多
平飛入氣順實快, e 家o的777 ar 330 ar 都好快ga (親身體驗過, 靈敏到呢=.="
咁既aoa 同速度入氣冇平飛o ...
原帖由 CWHS 於 25-7-2010 14:36 發表
比你講埋氣動特性, 以F-22, 咁唔洗講答案啦
addional F-22 的Thrust Vectoring 係做Pitch, Roll, 只係做唔到Yaw (F-35的F-135/6做埋Yaw)
原帖由 odyssey2007 於 25-7-2010 15:07 發表
我唔係話f22 氣動唔得, 咁既aoa 同速度, 除非你o個架係雪風, 唔係你覺得咁短時間, 救到機嗎? 睇番f22 o的demo o係o的咁既飛行條件2 個engine w/afterburner 反應力都比唔上正常狀態, 更何況e 家講緊1 engine out ...
原帖由 CWHS 於 25-7-2010 15:39 發表
問題一: Aileron壞左一邊, 得番一邊function, 那Aileron是否不能使A/C Roll?
additional 我又頭到尾都只係話Thrust Vectoring係幫手, 無話連control surface都壞埋wor
原帖由 odyssey2007 於 25-7-2010 15:55 發表
講緊thrust vectoring 又講aileron??
你知唔知f22 點樣唔郁control surfaces 單靠thrust vectoring 黎roll 先? 一邊engine out 單靠thrust vectoring 你點roll???
又講下aileron, 主翼面瀕臨stall 既情況突然一 ...
原帖由 odyssey2007 於 25-7-2010 16:36 發表
睇黎你真係唔知f22 點樣唔郁control surfaces, 單靠thrusting 黎roll 呢...
yup, with both engine running+ thrust vectoring+ 自身某o的氣動特性, then? apply 落今次既situation, 有幫助?
我一直都講緊係唔夠 ...
原帖由 odyssey2007 於 25-7-2010 16:36 發表
睇黎你真係唔知f22 點樣唔郁control surfaces, 單靠thrusting 黎roll 呢...
yup, with both engine running+ thrust vectoring+ 自身某o的氣動特性, then? apply 落今次既situation, 有幫助?
我一直都講緊係唔夠 ...
原帖由 odyssey2007 於 25-7-2010 17:36 發表
都話睇番個situation, 得番單邊engine 既話以f22 既thrust vectoring 頂多做到少少pitching, 有咩用?
engine 就算o係咁既環境o係4 秒裡面俾到respon 你, 唔好唔記得你只係得一個engine, 仲要唔知上唔上得切high pow ...
師兄呀師兄
MFD+HUD(If function select)+VOICE會出
"bleed air right" + "engine right", "Caution" + "Warning" button + Alarm.
讀個Civ PPL都會教你點做, 一個熟練的Pilot理應了解自己部機的Aerodynamic同flight control, 唔會做出Over Limitation 既事, 由求會致命, 可述係一個Combat Aviator, 唔會你Left Eng INOP敵人就唔打你架ma 亦都唔會因為有人打你你就可以restore 得快o的...
而500ft係唔多, 但做到既野唔可以話小, 由求對一部aerodynamic instability咁好既機, 一日你部A/C有Airflow都仲可以郁.
我成日都o係度講, 唔係唔郁得, 係你郁唔郁得切...電腦係會俾instruction 你...都話...問題係你做唔做得切...你follow 晒黎做要幾耐?你o係咩高度?學你咁講500ft既話你覺得你會夠時間做晒+ restore 到? 唔得先eject? 到時你既高度, 速度同姿勢又一定會適合你eject?
小弟對師兄提出4-8秒內, Engine唔能夠時間respon好有疑問, 除非部機係Full Loading Weapon & Fuel, 否則反應唔會話stall左都未有thrust. 作為一部5th Gen Fighter, 唔會以係4-8秒內respon thrust, 同唔可以achive幾Kts?
經十幾分鐘search完又search, 得知F-15c任可情況下可以4秒內由idle到Full Thrust. 仲搵到句咁既樣, 但師兄應該又會話一邊INOP, 但好像我一直都提及INOP, 亦沒有忘記帶來的pepenalties...(F-22試過4500ft做yoyo maneuver落番唔低過2000ft, 當然both eng ok)
"The two-dimensional nozzle vectors thrust 20 degrees up and down for improved aircraft agility. This vectoring increases the roll rate of the aircraft by 50 percent and has features that contribute to the aircraft stealth requirements."
氣流差到一邊engine surge/stall 既話另一邊engine 點會可以o係4 秒裡面推到full? 倒番轉諗, 一邊可以o係4 秒裡面推到full, 另一邊仲駛surge/stall??
咁我直接問...一架f22 o係45度aoa, stalling, 1 engine inop 既情況下要restore 要幾多時間, 損失幾多高度? 然後你計下500ft - 你得出黎要損失既高度, 係正數定負數? 正數既話正到幾多?
And 師兄我提出的Civ案例是指 Exceed而唔係Standard Operation AOA, 而唔係話佢地AOA大, 講AOA大, Military Cargo可以仲大. 竟然談到slotted flap呀
咁你個example 係幾多aoa, standard aoa of o個個stiuation 又係幾多?
至於slotted flap 同aoa of approch 有咩關係唔駛我講la
事發中CF-18又無事->Tailspin目視估計只係drop左no more than 100ft.
"In aerodynamics, the flight envelope or performance envelope of an aircraft refers to the capabilities of a design in terms of airspeed and load factor or altitude."
"計算AOA+Low Speed帶多的penalties落埋去, 小弟目視估計當時at least 500ft+"我句野又有事? ,講緊AOA + Low Speed Performance limitation.
你睇番你之前句野講乜?
車同飛機都有樣叫minimum turning radius既東西, 做特技時都excced左呢個limit, 造成好多的能量流失.........但...與直線Flyby無關係哦...
我係講not enough room for that maneuver
btw師兄有無學過stall/tailspin recovery呢...
原帖由 odyssey2007 於 25-7-2010 20:32 發表
同埋請記得就算4 秒俾你一個ENGINE 上到full thrust, 唔代表你一有thrust 就即刻可以restore from stall
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