How fuel efficient is a commercial airliner? A Boeing 747 burns approximately 5 gallons of fuel per mile or a total of 30,000 gallons (98 tonnes) on a flight between London and Hong Kong - a significant cost for an airline. The honeycomb seal-ring is an extensively used component, which has been proven to optimise the fuel efficiency of aero-engines, but the measurement of these seals present difficult engineering challenges. Now, HAESL

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