A similar thing from thirty odd years ago - I was working on the hill behind the big barn on the Dounreay road at Scrabster farm. A couple of guys turned up with a model airplane down by the Hill of Forss junction and started the engine. I carried on working then heard the R/C aeroplane overhead, flying high and heading West towards Brims. It didn't turn back...
They came up the hill and asked if I'd seen it come down in the whins, not wanting to believe me when I said no, it was flying fine as it passed overhead.
Turns out it was a new plane on its first flight and they'd filled the fuel tank right up.
I reckon it would have made it out over the sea before running out of fuel.
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