Now, if those RR engines that came originally with the Heron
Never Sir. RR build damn fine engines, but never fitted to the Heron Sir. de Havilland Gipsy Queen 30 Mark 2 rated at 250 bhp were the original fit if you please. Later re-engined with characterless 290-hp Lycoming IO-540s, Continental IO-470s,520s, or powered by two 750-shp Pratt & Whitney Canada PT6A-34 whining turbines. Heavens Sir, you do slight us, begone with you.
had quite a bit to do with the original with Gipsys - sigh