“People have been building solar aircraft since the 1970s, but it’s always been quite experimental and problematic incorporating solar into the wings,” Cameron's sister, Katie Donaldson, said.   

“There’s always been the problem of weight versus reward with putting solar cells into an aircraft. If you add solar cells you can produce your own energy and fly for longer, but if you make the aircraft heavier, it needs more power.

“Our process incorporates the cells into the composite structure, so the weight of the cells is offset by the weight that we’re removing from the structure. It makes the weight of the cells no longer prohibitive and therefore works with both Gallium Arsenide cells and also Silicon cells.”

Katie recently joined the company as a business partner, and said the technology enables drones to continue flying for up to three times longer than just using batteries.

The solution is water-proof, which means it could also be applied to boats and unmanned surface vehicles.

Praxis Aeronautics recently showcased the technology at Oshkosh Airshow in Wisconsin, and is now "in discussions with several major US companies, including a leading supplier of small UAVs to defence globally, including Australia".

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“We have the capability to build entire drones, but have made the deliberate decision to partner with other companies and provide solar variant solutions for their existing and future drones,” Katie said

“It’s important to showcase our technology to the right companies.

“We find we get a different response from people when they can physically see and touch the product.”

Praxis is among 24 South Australian companies that will be showcasing their products and services on the Defence SA stand at Avalon Airshow.