Maybe it swam back to Australia.
I have lost a few in the past. I make cross stick ones sometimes. Maybe yours was a non-returning tourist one. Or maybe a hunting one. Not all are supposed to return. It needs airfoils & L shaped to return properly. Maybe you knew that anyway.
If you're interested here's how to make a returning traditional by Vic.
www.youtube.com/watch?v=u-FQFu06d_c
(there are three parts)
(, Tue 3 Aug 2021, 20:55, Reply)