насколько я понимаю, AoA рассматривается с точки зрения оптимального Lift/Drag ratio.
Если я Вас правильно понял, то критерием оценки является изменение величины аэродинамического качества - Lift/Drag ratio. Но тогда, при изначальном значении угла атаки (АоА) соответствующем К мах. (АоА = АЛЬФА наивыгоднейший), любое изменение величины скоса потока приведет к уменьшению аэродинамического качества. В случае же несоответствия угла атаки (АоА) АЛЬФА наивыгоднейшему (К мах.), ответ будет зависеть от того, больше или меньше АЛЬФА наивыгоднейшего было изначальное его значение.
Всем привет, с таки наступившим НГ!)))) читаю Radio Navigation и никак не могу осилить сл. абзац(ы):
Once the aircraft is on a correct intercept heading, the rule is a simple one. When the angle formed by the aircraft’s heading and the desired course is the same as the angle between the zero mark at the top of the indicator and the pointer, then the aircraft is on the desired course (QDR or QDM). When intercepting OUTBOUND, the aircraft is on the desired course when the intercept angle is the same as the angle between the zero mark at the top of the indicator and the TAIL of the needle.
а также вот такой экзампл номер 2: Example 2: The aircraft heading is 265° and the RBI indicates 005°. The aircraft must join QDM 240 at an intercept angle of 60°.
The first step is always to visualise the aircraft’s position:
- What is the QDR? In this instance, it is east of the station. - Which way must the aircraft turn to make the intercept, left or right?
The course is to the right of the aircraft, so a right turn has to be made for the interception.
Which heading is required in order to intercept the QDM 240 with an intercept angle of 60°?
To intercept QDM 240 at 60°, the aircraft should turn to a heading of 300°.
Maintain a heading of 300°, and observe the RBI needle.
Since this is a 60° intercept, wait until the pointer falls 60° to the left of the zero indication on RBI. Mentally superimposing the RBI needle on the directional gyro always provides a good crosscheck for the calculations. To avoid overshooting the intended course, turn a few degrees before reaching the desired QDM. Observe the instruments and initiate the turn a few degrees before reaching QDM 240.The RMI eliminates the need to do any mental calculation. It always displays the QDM under the pointer and the QDR under the tail.
как-бы все это выразить на великом и могучем? а то на английском не совсем понятно((((((
Сообщение отредактировал Omut-city - Понедельник, 16.01.2012, 06:26
что-то теорию забросили совсем. вот вам немного для разминки:
Carburettor heat is provided to combat icing within the carburettor and induction system and directs heated air into the carburettor inlet. The alternate air control is: a ) usually provided on fuel injected engines and offers an alternative source of air that is not prone to obstruction by either a filter or airframe icing b ) usually provided on fuel injected engines and serves exactly the same function as carburettor heat on an engine fitted with a carburettor c ) provided to select filtered air in dusty conditions d ) provided as a second source of static air to the pressure instruments
раз уж я седня в выходной вышел поработать, то есть время набрать еще вопросов
2) Buys-Ballot's law states, for the southern hemisphere, that if you stand with your back to the wind, the low pressure area will be: a ) on your left b ) on your right c ) behind you d ) in front of you
3) A straight track line drawn on a WAC chart is actually: a ) a rhumb line track which is the shortest distance b ) a great circle track which has a constant angle with meridians c) a rhumb line track that theoretically requires a constant change of heading in order to follow it d ) a great circle track that theoretically requires a constant change of heading in order to follow it
4) In a forecast, cloud cover described as scattered (SCT) and broken (BKN), means: a ) 1-2 OKTAS and 3-4 OKTAS respectively b ) 3-4 OKTAS and 5-7 OKTAS respectively c ) 1-2 OKTAS and 5-7 OKTAS respectively d ) 3-4 OKTAS and 4-5 OKTAS respectively
5) If, a pre-flight engine run-up, the engine RPM increases when carburettor heat is selected, this: a ) is normal on any aircraft b ) will normally happen on particularly hot days c ) might indicate a partially blocked air filter d ) indicates that the ignition timing is too far advanced