The Drover..... With no load, ie: pilot and minimum fuel, wing engines only, would fly. Not good assymetric, however, but who is? I recall a pilot being given his endorsement on Kangaroo Island way back in the never never, who suggested that, upon right wing ( number 3 ) failure, would like to hand over, being told, "Get on with it, this is the assymetric part of the endorsement"! Jim Hazelton, RIP, was there three days later in a Comanche, spare engine in the boot, to get the old girl going again. T'was ADN, ex TAA, from memory, had Lindeman Island, and "Capt ?? Angus or Horrie ?? on the side. Salad days indeed. Another note. When men were men, and women were glad of it, a certain aircraft captain, with a friendly cohort aboard, attempted to launch out of Yorketown on a sunny day, bound Kangaroo Island. By fair means or foul, the lack of power indications from number 2 Lycoming (in this case) were not detected at start, or for indeed, any of the takeoff roll. On completion of the groundloop at the end of the strip, the ever intrepid aviator reached into the breast pocket, and addressed his passengers with, "Anyhow, Have a Winfield" Hope this helps solve the mystery of Drover engine out performance.