Vector1 your grand dad was a real character. I used to hop in my 185 a couple of times a month, on my days off, and fly a load of fresh meat, bread etc from Moresby to Bensbach before he bought his own 185.
His (ex Missionary Aviation Fellowship) 185's callsign was MFU. I flew it for him a few times before another pilot crashed it. He didn't land hard but landed long/fast and was not able to stop before going off the end of the airstrip and flipped upside down. I cannot remember which strip now but out in the Western Province.
Here is a picture of MFU taken at another Western Province strip called Arufi when rescuing another Cessna that came to grief in bad weather on a slippery strip.
Sad to hear of his passing.