A backyard bid to turn a keen angler into a flying fisherman using a giant drone has drawn the attention of Australia's aircraft regulator.

A video published in the drone-focused Facebook group "UAE Me" shows behind the scenes footage of a group of men constructing a huge six-prop drone.

It shows a test flight over the Upper Coliban Reservoir in the Macedon Ranges north of Melbourne, with Kyneton fisherman Sam Foreman dangling under the aircraft in a chair fitted with a stubby holder and bottle of VB.

The drone lifted the fisherman over the reservoir. (Facebook)

The large six-prop drone during a test run in the Macedon Ranges region. (Facebook)

The fisherman cast off from his spot metres above the water, and appeared to reel in a pre-gutted fish.

The Civil Aviation Safety Authority (CASA) said in a statement to 9News it was aware of the video and an investigation was underway.