How fuel efficient are helicopters?

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Tags

  1. #given
  2. #about
  3. #turbine
  4. #helicopter
  5. #knots
  6. #gallon
  7. #litres
  8. #miles
  9. #carries
  10. #weight
  11. #aircraft
  12. #speed
  13. #sikorsky
  14. #conventional
  15. #passenger