O.T. I had to laugh when I saw this. Actually I didn't notice it until one of the guys working on restoring the planes at the RAAF Amberly Aviation Heritage Center pointed it out to us. This museum is open to the public only once a month, but is available on Tuesdays and Thursday to people who have access to the RAAF base, which we did. Consequently, we were the only "tourists" there when we visited on the day before we left Australia, and a couple of the men working on various restoration projects gave us a private tour. It was very cool. One of the planes there is this one, a DHC-4 "Boo". See the round yellow things just in front of each landing gear strut? Cement blocks! Placed there to prevent the Boo and other planes parked outdoors from blowing away when the big wind storms come through!