full transcript

From the Ted Talk by Alex Gendler: Why are airplanes slower than they used to be?

Unscramble the Blue Letters

So while military aircraft conduct high speed flights over water and at high altitudes, supersonic ccemiamorl flights seemed like a brief and failed experiment. But recent advances may make them feasible again. raeescrh by NASA and DARPA has shown that modifying an aircraft’s shape can reduce the impact of its sonic boom by 1/3. eendtxnig the nose with a long spike can break the shockwave into slleamr ones, while another proposed design features two sets of wnigs producing waevs that cancel each other out. And new technologies may svole the energy efficiency problem with aanvttielre and synthetic fuels, or even hybrid-electric planes. It may yet turn out that the last few decades of steady flying were just a brief rest stop.

Open Cloze

So while military aircraft conduct high speed flights over water and at high altitudes, supersonic __________ flights seemed like a brief and failed experiment. But recent advances may make them feasible again. ________ by NASA and DARPA has shown that modifying an aircraft’s shape can reduce the impact of its sonic boom by 1/3. _________ the nose with a long spike can break the shockwave into _______ ones, while another proposed design features two sets of _____ producing _____ that cancel each other out. And new technologies may _____ the energy efficiency problem with ___________ and synthetic fuels, or even hybrid-electric planes. It may yet turn out that the last few decades of steady flying were just a brief rest stop.

Solution

  1. commercial
  2. research
  3. wings
  4. extending
  5. smaller
  6. solve
  7. alternative
  8. waves

Original Text

So while military aircraft conduct high speed flights over water and at high altitudes, supersonic commercial flights seemed like a brief and failed experiment. But recent advances may make them feasible again. Research by NASA and DARPA has shown that modifying an aircraft’s shape can reduce the impact of its sonic boom by 1/3. Extending the nose with a long spike can break the shockwave into smaller ones, while another proposed design features two sets of wings producing waves that cancel each other out. And new technologies may solve the energy efficiency problem with alternative and synthetic fuels, or even hybrid-electric planes. It may yet turn out that the last few decades of steady flying were just a brief rest stop.

Frequently Occurring Word Combinations

ngrams of length 2

collocation frequency
commercial flights 3
sonic boom 2
fuel economy 2

Important Words

  1. advances
  2. aircraft
  3. alternative
  4. altitudes
  5. boom
  6. break
  7. cancel
  8. commercial
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  10. darpa
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  14. energy
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  17. failed
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  22. fuels
  23. high
  24. impact
  25. long
  26. military
  27. modifying
  28. nasa
  29. nose
  30. planes
  31. problem
  32. producing
  33. proposed
  34. reduce
  35. research
  36. rest
  37. sets
  38. shape
  39. shockwave
  40. shown
  41. smaller
  42. solve
  43. sonic
  44. speed
  45. spike
  46. steady
  47. stop
  48. supersonic
  49. synthetic
  50. technologies
  51. turn
  52. water
  53. waves
  54. wings