- •Unit 6 Aircraft and Some Facts about the Flight
- •1. Look at the picture. What do you think this picture shows? Share your ideas with your partner.
- •2. Try to answer the following questions before you read the text.
- •1. Read the text and match the English word combinations with their Russian counterparts.
- •2. Read the text and check whether your answers were correct.
- •3. Read the text and write out the words you don’t know, try to guess their meaning from the context. Compare your notes with your partners. Aircraft and some facts about the flight
- •1. Divide the text into logical parts. Think of the subtitle to each part. Highlight the key words of each part.
- •2. In the text find the definition of lifting force and air resistance.
- •3. Complete the following sentences with suitable words from the text:
- •4. These are the definitions. Guess the terms.
- •5. Agree or disagree with the statements. Use conventional formulae of agreement and disagreement.
- •Vocabulary Focus
- •1. Match the word in column a with the word in column b having a similar meaning. Be careful, there are some extra words in column b.
- •2. Match the antonyms.
- •3. Choose the best alternative to fill the gaps in these sentences.
- •1. Translate the text in a written form.
1. Translate the text in a written form.
High-Speed Flight Ranges
Transonic. When the speed of flight is less than the speed of sound, but of sufficient velocity to induce supersonic airflow over some part of the structure of the aircraft, the airplane is said to be in the transonic speed range. That is, it is in the region of speed of sound.
Supersonic. As flight speed increases further, a point is reached where the airflow over all parts of the aircraft is supersonic, or above the speed of sound. When this happens, the airplane is in the supersonic speed range.
Hypersonic. As a body moves through the air at high speeds, a short amount of time is required for the molecules of air to adjust themselves to the presence of the fast-moving body and to readjust themselves after the body has passed through them. This period of adjustment and readjustment is called the relaxation time. If a body is moving at a speed greater that the relaxation time, it can be classed as being in the hypersonic speed range.