I had the great good fortune while I was in Belgium recently for the photoflying days to see Osa's Ark and meet her owner Tom Schrade. More details about her are on Tom's website Unlimited Adventure. I've also put a short piece about her on Wonky Horizons.
Osa's Ark
Osa's Ark and Yak-18 prepare for takeoff
The Ark and Yak-18
Osa's Ark taking off with the Yak
Tom refuelling
Canal landing near Viersel
Taking off from the canal
Canal landing
Touching the canal (note the photographer at the rear.)