Apparently the Audax was an army co-operation variant of the Hart and the modifications included a retractable hook (very much like a carrier arrester-hook) which could be lowered to deliver and receive written messages.
Upon seeing one for the first time and being told it was called an "Audax" a rather grizzled ex-Royal Flying Corps flight-sergeant was heard to say;
"That's not an Audax, that's an 'art wiv an 'ook "
Last edited by virgo; 5th Jun 2008 at 19:57.