I think David is getting close.
It is obviously some improvised object as the big tube hanging down has no aerodynamic consideration and in fact it must be pushed up almost horizontal by the air flow in flight. If it is strong enough to stay vertical - does not look like it - it would be serious drag.
I will ask the Beaufort restoration mob at Caboolture about it (I was not aware a Beaufort had external racks)
Lang
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