Odd sounding prop
Walking the dog today in Sandhurst (Surrey Hants Berks border)unusual prop sound caught mt attention , nothing as deep as the Antonovs not a Herc or an Atlas, despite clear skies I couldnt see much although there was a smallish aircraft high but no contrails heading SE at about 0900.
It was just the unusual sound that caught my attention, sort of half way between a piston noise and turboprop although i think in both cases its the prop not the engine that makes the most noise. Any ideas?