After five years of construction at six different shipyards, one of the UK's most-challenging engineering projects is almost at an end. In just a couple of months' time, HMS Queen Elizabeth II-Britain's first new aircraft carrier in more than 30 years - will float out of its dry dock in Rosyth, Scotland. For the latest of our reader Q&As, we put your questions on the design and production of the new ship to BAE's David Downs, engineering director of the Aircraft Carrier Alliance (ACA).
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