This is a technical drawings of a old Wirraway air craft used from 1939 to 1959. It was used by the RAF (Royal Air Force). This drawing was made to communicate the clearances and lubrication on this engine. Clearances are extremely important in engines because they heat up and cool down, so that means they expand and contract. You have to make sure that when you first start the aircraft up it works properly but you also have to allow for the expansion of the metals in the engine as well. Sometimes you have an aluminum engine black that houses everything and some other part might be an aluminum alloy or even iron so that part will expand differently than the rest of the engine block. The audience is engineers working on designing or manufacturing this engine as well as the repair crew that would be fixing the engine or doing maintenance on it. I know all of this because these drawings can be extremely difficult to read and not everyone knows how to read them. In this way I know it is geared towards that audiences because of the language used.
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