Flew the Heron in Fiji decades ago. We flew it IFR single pilot with no autopilot. On long range trips to Funafuti we added a copilot and mtow of 13,500 lb. Used Loran C to navigate there. The radio guy there asked us to call ten miles out. They would then sound a siren and the locals would pull all the football goal posts out of the ground and everyone would scatter off the strip. Loved it. They were Riley Herons. Years later got checked on the Gypsy Queen engines but never flew it in service.