- 1/3 of operating costs of airlines is fuel
- 70% of jet aircrafts in service are over 80% more fuel efficient per seat kilometre than the first jets in the 1960s
- Worldwide, flights produced 781 million tonnes of CO2 in 2015
- 35% -40% of the energy from the fuel is converted to propulsive energy
- A Boeing 747 is made up of six million parts
Aerospace systems normally operate under severe environmental conditions. The general tribological factors of friction, wear and lubrication are now all taken into account during aerospace design. Over a period of four decades, a wide range of lubricants and surface coatings have been developed for use in aerospace systems. The lubrication systems of aero-engines are designed to lubricate the bearings and gears of the transmission system as well as cool gearboxes with the help of heat exchangers. Recent Research and Development work has been targeted at improving the quality and efficiency of these lubricants and developing new light weight protective coatings.
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