k******u
发帖数: 3137 | 1 I feel that Airbus family do not use reverse thrust very much. America-made
or the CRJs use this almost exclusively. I could be wrong. |
|
t*n
发帖数: 14458 | 2 俺做的飞机还没遇见过落地不反推的
I feel that Airbus family do not use reverse thrust very much. America-made
or the CRJs use this almost exclusively. I could be wrong. |
|
c*******n
发帖数: 628 | 3
小!!! FAA 对飞机制造商早就有规定 -- 反推是作为一种紧急处置设备, 不是常规降落
使用的! 在飞
场的.
口口声声说FAA，把规则拿出来，看看你所谓的规则讲的是飞机制造，还是飞行安全。
NTSB在2006年对于一次飞行意外发表的调查报告当中，认为飞行员延迟18秒使用
反推反而造成意外。
NTSB管不到飞机制造。
既然你认为你很懂，FAA的相关规定拿出来，Reverse Thrust Credit是怎么规定的，
你来说明说明。 |
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p******y
发帖数: 3742 | 4 1. The missile launches out of its silo by firing its first stage boost
motor (A). 2. About 60 seconds after launch, the 1st stage drops off and the
second stage motor (B) ignites. The missile shroud (E) is ejected. 3. About
120 seconds after launch, the third stage motor (C) ignites and separates
from the 2nd stage. 4. About 180 seconds after launch, third stage thrust
terminates and the Post-Boost Vehicle (D) separates from the rocket. 5. The
Post-Boost Vehicle maneuvers itself and prepares fo |
|
T*****T
发帖数: 199 | 5 ft,不要满嘴喷粪。
现在用得苏35的发动机。 苏35用的是Saturn 117S，已带2D thrustvectoring。thrust
vectoring也不是啥新鲜玩意， 阿三的苏30MKI就有。
t50估计最终要用新发动机加3D喷管。 |
|
t*n
发帖数: 14458 | 6 T50那里来的二维矢量喷管？
ft,不要满嘴喷粪。
现在用得苏35的发动机。 苏35用的是Saturn 117S，已带2D thrustvectoring。thrust
vectoring也不是啥新鲜玩意， 阿三的苏30MKI就有。
t50估计最终要用新发动机加3D喷管。 |
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d********r
发帖数: 303 | 7 狂风的基本数据：
* Empty weight: 13,890 kg (31,620 lb)
* Max takeoff weight: 28,000 kg (61,700 lb)
* Maximum speed: Mach 2.34 (2,417.6 km/h, 1,511 mph)
* Range: 1,390 km (870 mi) typical combat
* Ferry range: 3,890 km (2,417 mi) with four external drop tanks
* Service ceiling: 15,240 m (50,000 ft)
* Rate of climb: 76.7 m/s (15,100 ft/min)
* Thrust/weight: 0.55
Armament
* Guns: 2× 27 mm Mauser BK-27 cannon with 180 rounds per gun (versus 1
× BK-27 mounted on Panavia To |
|
h****l
发帖数: 7290 | 8 compressor's blades.
typically, for turbojet
if the force forward is 100%
50% on compressor
30% on combustion chamber
20% on nozzle
while 50% on turbine, but backwards.
so 50% of the forward force forms thrust. |
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p*********e
发帖数: 32207 | 9 还有点儿没弄明白
这个force forward指的是什么?向前的作用力?
你的意思是说燃烧室里混合汽燃烧膨胀之后,
向前的作用力有50%作用在高压压气机(燃烧室之前),30%作用在燃烧室的壁上
然后20%作用在喷嘴上?
那后面的50% on turbine是指全部作用力的一半是向后的,
全部作用在turbine上从而驱动compressor?
然后形成thrust的是chamber+nozzle的部分? |
|
s********e
发帖数: 13723 | 10 【 以下文字转载自 Military 讨论区 】
发信人: superphase (多情应笑我), 信区: Military
标 题: BBC:中国计划造土星5号级别的火箭
发信站: BBS 未名空间站 (Wed Aug 11 17:01:40 2010, 美东)
http://www.bbc.co.uk/news/science-environment-10762634
"Rockets (with 600-tonne thrust engines) would only be justified for things
like sending humans to the Moon, if such projects are approved," Li Tongyu
told BBC News.
Related stories
In March, the official China Daily newspaper disclosed that CALT was
studying a super-heavy launch vehicle, which could be used t |
|
k***d
发帖数: 113 | 11 AIM-9 Sidewinder Specification
Specifications
Primary Function Air-to-air missile
Contractor Naval Weapons Center
Power Plant Hercules and Bermite Mk 36 Mod 71, 8 solid-propellant rocket
motor
Thrust Classified
Speed Supersonic Mach 2.5
Range 10 to 18 miles depending on altitude
Length 9 feet, 5 inches (2.87 meters)
Diameter 5 inches (0.13 meters)
Finspan 2 feet, 3/4 inches (0.63 meters)
Warhead Annular blast fragmentation warhead
25 lbs high explosive for AIM-9H |
|
v**e
发帖数: 8422 | 12 Price Talks Imminent On GE F414 Engine For India LCA
Oct 6, 2010
By Neelam Mathews m************[email protected]
NEW DELHI
Price negotiations will begin soon for 99 General Electric F414 fighter jet
engines selected to power the Mk II version of the Indian Air Force’s Tejas
Light Combat Aircraft (LCA).
India’s Aeronautical Development Agency (ADA) awarded the contract on Oct.
1, and it is expected to be signed in a few months (Aerospace DAILY, Oct. 1).
The F414 engine was in the running along with th... 阅读全帖 |
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w********r
发帖数: 14958 | 13 都按wiki上loaded weight算得
如果看J10，简直惨不忍睹
Loaded weight: 14,876 kg (32,797 lb)
Thrust with afterburner: 122.5 kN[14] (27,557 lbf )
推重比才0.85 |
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w********r
发帖数: 14958 | 14 这个是我记错了。 确实记得有这个谣言，刚才一查，确实是谣言。
The United States Marine Corps is planning to purchase 340 F-35Bs,[185] to
replace all current inventories of the F/A-18 Hornet (A, B, C and D-models),
and AV-8B Harrier II in the fighter, and attack roles.[186]
In November 2010 as part of a cost-cutting measure, the co-chairs of the National Commission on Fiscal Responsibility and Reform suggested canceling procurement of the F-35B and halving orders of F-35As and F-35Cs.[39][40][41] At the same time Air Force Mag... 阅读全帖 |
|
|
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w********r
发帖数: 14958 | 17 据说2015年，会装上WS15
http://en.wikipedia.org/wiki/Chengdu_J-20
It was reported in November 2006 that a T/W=10 17,000kg class turbofan (WS-
15/"large thrust") is being developed for J-20. This new engine is currently
scheduled for testing on J-20 in 2015. |
|
c***n
发帖数: 2232 | 18 【 以下文字转载自 Military 讨论区 】
发信人: Regina (猫宝宝), 信区: Military
标 题: 空中力量澳大利亚 文章: 中国新型J20隐形战机对F35和F/A-18意味着什么.
发信站: BBS 未名空间站 (Fri Dec 31 18:54:16 2010, 美东)
空中力量澳大利亚 文章: 中国新型J20隐形战机对F35和F/A-18意味着什么.
来源: googleit 于 2010-12-31 15:09:43 [档案] [博客] 旧帖] [转至博客] [给我悄
悄话] 本文已被阅读：186次 字体：调大/调小/重置 | 加入书签 | 打印 | 所有跟帖
| 加跟贴 | 查看当前最热讨论主题 摘要:
F35基于错误的理论"飞机的机动性无关紧要,让导弹做转圈的活. "
* 第一, 假定F35能撑到可发射导弹的位置, 但是J20和T50拥有低可探测性, 又非得多
快得多, 因而使他们的下视下射导弹拥有先发制人的优势;
* 第二, 更危险的是, J20和T50有超强的应对来袭导弹的措施(包括超机动, 隐形等,超
高速,及电子对抗措施, 让F35会转圈的... 阅读全帖 |
|
q****i
发帖数: 1395 | 19 By Dragon Emperor
For those of you who say that the big size of the J-20 makes it less
manoeverable than the F-22, i say that 5th gen fighters are not supposed to
be dogfighters, so manoevrability is not an issue because BVRAAMs will
decide the fight in future wars as well as AESA radars. I have provided a
link to a site that will give more insight, perhaps.
http://www.ausairpower.net/APA-NOTAM-311210-1.html
The latest monograph by Dr Kopp, as published in the peer reviewed APA
Analyses journal,... 阅读全帖 |
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k**0
发帖数: 19737 | 20 看VIDEO里面是不是就用一个thrust vector引擎做到这一切? 没有看到其它机翼可动部
分. |
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A*V
发帖数: 3528 | 21 是这一篇?
http://www.cnn.com/2011/WORLD/asiapcf/01/05/china.us.fighter.je
CNN) -- Images believed to be of China's next generation of military air
power have been buzzing around the internet, but Pentagon officials are
insisting it does not mean China has matched American air capabilities.
The new Chinese stealth fighter jet, known as the J-20, isn't supposed to be
operational until at least 2017, but a Chinese air force commander told
Chinese TV in 2009 that flight testing would begin mu... 阅读全帖 |
|
S*****C
发帖数: 62 | 22
关系
117的推重比高，其wet thrust自然也高，当然直接影响超巡速度。
毛子等离子发展到什么程度，谁现在没法下定论。就像这次四代在公开前，很多国外专
业军士评论员，甚至军方人士，知道的不一定必国内军米多。 |
|
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m**w
发帖数: 39 | 24 看来正是照原计划实行。
11 December 2002
CHINA REVEALS NEW STEALTH FIGHTER PROJECT
China is developing a new stealthy fighter jet aircraft and many of the
design concepts and components have already been created, senior sources
from the China Aviation Industry Corp I (AVIC I) have told Jane’s
Defence Weekly. This new aircraft is the first Eastern rival to the
West’s F/A-22 Raptor and F-35 Joint Strike Fighter to be put into
development, claim Chinese officials.
The aircraft - tentatively dubbed the J-X and ... 阅读全帖 |
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s*********r
发帖数: 21 | 25 did not use the after burning and took off in 500m. good thing.
鸭翼布局是对no vector thrust engine 的对策。。好像成飞还是比较注重高空高速的
，J20 的展旋比要比F22 小， 三角机翼后掠角比较大，低俗机动性还是不会比F22强的
。 |
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p*********e
发帖数: 32207 | 26 我倒是觉得,就thrust vectoring的字面意思来讲
你通过多个不同朝向的发动机来控制,跟单个喷口可转向,都属于推力矢量的范畴
只是具体实现形式的不同 |
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r********n
发帖数: 7441 | 27 对啊，让推力方向偏离重心以在作用点(旋转圆心)处产生相应的力矩，这个比通过调整
机翼副翼来得更直接响应更快，主要是为了机动性，最早应该使用在导弹上的
wiki 一下 thrust vectoring |
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p*********e
发帖数: 32207 | 28 神机F135的dry thrust,根据wiki
是125kN或12.7吨
这也就罢了
关键是它那两个数字本身都不自洽
加力推力不可能只比干推力高那么点儿 |
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p********r
发帖数: 1432 | 29 Notice that the air speed of this plane is very low, so the ailerons, also the wings, are almost ineffective. Actually, the plane is in stall. There is negligible force on the wings, flaps and ailerons.
However, the slip stream on the vertical stabilizer is strong due to the
strong thrust of the prop. |
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w*******g
发帖数: 9932 | 30 是啊. 就是勃起和自然状态的区别. 这和360度旋转还是有区别的.
TG正在研制vector thrust. 就是有装也不奇怪. 不过这个图片不能证明而已. |
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k******a
发帖数: 2436 | 31 Many aviation experts believe that the J-20 relies on a pair of Russian
engines or their Chinese copies. In other words, the J-20’s engines are
picked out among members of the big family uniting the Item
117, AL-31F, WS-14 and WS-10 Taihang. Two engines together develop in
between 30 and 40 tons of thrust. If that is so, then the capability of the
propulsion system
Aircraf t
is enough for supercruise, or supersonic cruise flight at military power (
highest pow- er setting without afterburning). ... 阅读全帖 |
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w********r
发帖数: 14958 | 32 我就爱刨根问底。
人家全球鹰的数据也是06年6月RQ-4A“老掉牙”的数据。 当时生产代号叫block10. 最新全球鹰的生产批号是block30。 而且从block20开始，主要改进就是飞机的任务载荷(不算燃油)上升到3000pound（约1.35顿）
这里提的航程有点区别。 usaf给的数据是9500nm 约等于17594km(A型)，16112km(B型)
诺思罗普格鲁曼自己给的数据ferry range是22780km(B型)
http://www.as.northropgrumman.com/products/ghrq4b/assets/GH_Bro
General Characteristics
Primary function: High-altitude, long-endurance ISR
Contractor: Northrop Grumman (Prime), Raytheon, L3 Comm
Power Plant: Rolls Royce-North American AE 3007H turbofan
Thrust: 7,600 pounds
W... 阅读全帖 |
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c**i
发帖数: 6973 | 33 Well, you assert China is the best. So be it.
Perhaps it is why no Chinese even bother to commnet on it.
Your paragraph 1 is too hypocritical. Really stinks.
I will take a pity on you and say something. For those who are not familiar:
沈飞: 沈阳飞机工业集团;
T-10K: a prototype of Su-33 China stole from Russia--through Ukraine. See (2
) below.
(1) You say, "毕竟J-15还是师从SU-33，很多在SU-33使用过程当中没有出现过的问题
，很有可能在J-15身上出现，如果我们真正的吃透了T-10K或者说是SU-33的技术，那么
出现问题我们可以解决，如果我们没有吃透技术，那么很有可能在未来三到五年之后，
出现J-15大面积停飞的事故。
Even if Chi... 阅读全帖 |
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p*********e
发帖数: 32207 | 34 解说里面说w/ thrust vectoring了 |
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r*****y
发帖数: 53800 | 35 这两个性质完全不同。一个是对地名的单纯翻译错误。另一个则是故意曲解原意，作为
美军“认输”的证据，来为自己捞取政治资本。朝鲜也干过类似的事情，只不过这里的
“wrong enemy”就变成了朝鲜而不是中国。
布莱德雷的原话如下。
A more complete passage of Bradley's testimony is:
I am under no illusion that our present strategy of using means short of
total war to achieve our ends and oppose communism is a guarantee that a
world war will not be thrust upon us. But a policy of patience and
determination without provoking a world war, while we improve our military
power, is one which we believe we must continu... 阅读全帖 |
|
c*********r
发帖数: 19468 | 36 几百公斤是F-14的可变机构本身带来的重量，你自己google下呗
要考虑间接重量变化，这个就难说了，还有说反过来的：
Ray Whitford (Design for Air Combat, Jane's Information Group, 1989, pp. 72)
conflicting requirement of high maximum Mach number, subsonic loiter and
carrier suitability but found that this required a larger wing area and a
higher thrust to weight ratio, making the fixed wing design considerably
heavier (about 4500 lbs heavier). |
|
n*******4
发帖数: 2285 | 37 请问你说：“满不满油和弹射无关”的根据是什么？如果满油起飞而不能挂任何武器，
那满油也没意义。现在的估计是J-15无法在辽宁号上满油满弹最大起飞重量起飞。以J-
15的最大推力（开加力的），满油满弹最大加速不到1个g，而弹射的加速是2-3个g。就
算150米跑道，0.8g加速，外加航母开全速的30节甲板风，J-15离舰速度最大60米每秒
，216公里每小时， 不到240公里每小时的Su-33最低起飞速度。这还不算起落架摩擦和
空气阻力作用， 实际速度更低。
http://www.chinesedefence.com/forums/chinese-navy/603-chinese-n
Basic stats for Su-33/J-15
length: 21.94m
wing span:14.7m
height:5.93m
wing area:62 m^2
empty weight:18400kg
standard fuel capacity:5700kg
maximum internal fuel capacity:9300kg
maximum TOW:32800kg
take-off... 阅读全帖 |
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p*********e
发帖数: 32207 | 38 ok
777上的GE90-115B, dry weight 18260lb, max thrust 514kN
(514/9.8)/(18260*.454)=6.32
6.32 vs 7.95
好"巨大"的差异 |
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T****r
发帖数: 22092 | 39 http://www.defensenews.com/article/20130325/DEFREG03/303250014/
-Deal-Sale-Fighters-Subs-China?odyssey=tab
Russia: No Deal on Sale of Fighters, Subs to China
Mar. 25, 2013 - 12:41PM
TAIPEI — Russia is denying Chinese media claims that Moscow and Beijing
have signed agreements to sell Russian-made arms and military technolog
y to China, including 24 Su-35 multirole fighter jets and four Amur-clas
s diesel submarines.
During a recent visit by Chinese President Xi Jinping to Moscow from Fri
day to ... 阅读全帖 |
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O**l
发帖数: 12923 | 40
笑死我了 不知道谁在这现眼
Maximum speed: 350 mph (560 km/h)
Range: 192 miles (307 km)
Service ceiling: 20,000 ft (6,100 m)
Rate of climb: ft/min (m/min)
Wing loading: 35.2 lb/ft2 (172 kg/m2)
Thrust/weight: 1.48
x13这个 performance 我本来以为你在这说笑话 原来真是2啊 |
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s*********0
发帖数: 2045 | 41 今天看到这个帖子，转过来让你开开眼：
http://theaviationist.com/2013/05/21/f-35-aoa-test/#.UbUUQvn2bl
"To be honest, this F-35 fighter jet High-AOA testing video has nothing to
be impressed of"
Some media outlets that received the release published interesting reviews
about what they defined “shocking” or “most awesome” footage ever seen,
allegedly showing the aircraft’s superior maneuverability.
Few weeks ago, Bill Flynn, Lockheed test pilot responsible for flight
envelope expansion activities for the F-35, told ... 阅读全帖 |
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a***e
发帖数: 27968 | 42 1.5M normal thrust disengage |
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c*********r
发帖数: 19468 | 43 请问内行，0.57涵道比是为超巡设计的？还有，推比15是用dry thrust算出来的？ |
|
n******r
发帖数: 236 | 44 建议你补充下面的知识点，再做分析
1.拉格郎日和欧拉表象下的牛顿定律
2.System and control volume analysis.
3.Hydrostatic pressure的物理意义。
具体列出你分析中的错误
牛顿第二运动定律 F=ma
物理初级爱好者经常犯的错误，这个公式是拉格郎日表象的一般表达。具体来说，m是
一个identifiable object的质量，譬如你的火箭固体部分；F是作用在这个
identifiable object 上的力。所以你可以用这个公式计算火箭的瞬间加速度。
但是
你写到200000 = 200 * a；认为200000 N是反作用在喷出水柱上的力，这个没有问题。
但是200 kg/s不是一个identifiable object，不同时间200000 N作用在“不同”的水
分子上。就象甲乙丙丁几个人一个接一个从一个船上往后跳，虽然船不断受一个向前的
推力，同时跳船的人瞬间受到一个反作用力，这个反作用力不同时间作用于不同的人个
体。对于火箭喷射流体这样的问题，我们不可能identify 每一个水分子。所以不能直
接把F=ma用于水体。记... 阅读全帖 |
|
t******e
发帖数: 2504 | 45 白善桦的英文版回忆录，说金城战役中的韩军， 反应和以前不同，“From Pusan To
Panmunjom", p239.
In each of the previous six major offensives, the Chinese Army aimed its
main thrust at ROK army units, which then lost the will to resist in the
first moments of Chinese onslaught, their officers flustered, their men
running aimlessly about. I saw no such reactions on this occasion. The
overwhelming weight of Chinese attck had penetrated our lines, to be sure,
but our units quickly reorganized themselves, morale remained high, and
e... 阅读全帖 |
|
发帖数: 1 | 46 Type Intercontinental ballistic missile
Place of origin India
Service history
In service 2016-Current
Used by Strategic Forces Command
Production history
Designer Defence Research and Development Organisation (DRDO)
Manufacturer Bharat Dynamics Limited
Unit cost ₹50 crore (US$7 million)
Specifications
Weight 50,000 kg
Length 17.5 m
Diameter 2 metres (6 ft 7 in)
Warhead Nuclear
Warhead weight 1,500 kilograms (3,300 lb)
Engine Three stage ... 阅读全帖 |
|
g********d
发帖数: 4174 | 47 http://washingtonexaminer.com/opinion/columnists/2011/02/states
States should be allowed to disagree on gay marriage
By: Steve Chapman 02/27/11 9:05 PM
President Obama has been denounced by Republicans for asserting federal
power at the expense of state sovereignty. But last week, he was denounced
by Republicans for ... not asserting federal power at the expense of state
sovereignty.
It happened after the Justice Department announced it would not litigate to
uphold the Defense of Marriage Ac... 阅读全帖 |
|
g********d
发帖数: 4174 | 48 The man considered one of our greatest living gay authors, and a leading
proponent of liberation not assimilation for LGBT folks, says he's had a
change of heart about same-sex marriage. "Just like Barack Obama, my views
on gay marriage have evolved," he wrote in The Guardian."And now I am a
reluctant groom."
White says that Obama's decision is historic, but not isolated, and as
American's have increasingly come out in support of marriage equality the
pioneering author has "evolved" in his affir... 阅读全帖 |
|
U*E
发帖数: 3620 | 49 Pilots of the Asiana Airlines jet that crashed at San Francisco
International Airport over the weekend allowed the Boeing 777's speed to dip
dangerously low, and then apparently ran out of time to correct their
landing approach, according to preliminary data released by investigators.
While stopping short of pinpointing pilot error as the likely cause of the
fiery crash that killed two teenage passengers and injured dozens of others,
National Transportation Safety Board Chairman Deborah Hersman ... 阅读全帖 |
|
w**t
发帖数: 227 | 50 【 以下文字转载自 Military 讨论区 】
发信人: Regina (猫宝宝), 信区: Military
标 题: 空中力量澳大利亚 文章: 中国新型J20隐形战机对F35和F/A-18意味着什么.
发信站: BBS 未名空间站 (Fri Dec 31 18:54:16 2010, 美东)
空中力量澳大利亚 文章: 中国新型J20隐形战机对F35和F/A-18意味着什么.
来源: googleit 于 2010-12-31 15:09:43 [档案] [博客] 旧帖] [转至博客] [给我悄
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F35基于错误的理论"飞机的机动性无关紧要,让导弹做转圈的活. "
* 第一, 假定F35能撑到可发射导弹的位置, 但是J20和T50拥有低可探测性, 又非得多
快得多, 因而使他们的下视下射导弹拥有先发制人的优势;
* 第二, 更危险的是, J20和T50有超强的应对来袭导弹的措施(包括超机动, 隐形等,超
高速,及电子对抗措施, 让F35会转圈的... 阅读全帖 |
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