boaccomet4 - You could try perusing the SMH online for mid-June 1975 to see if there was any report on the incident.
I did a quick search of the June 15, 1975 copy of the newspaper, but the overwhelming aviation news of the day was a tragic air crash of a Piper Cherokee near Scone that killed a mother and father.
Two small children of the couple escaped uninjured and went for help, and were found by sheer luck, by a farmer on horseback 6 hrs later, in freezing conditions and in mountainous terrain.
I couldn't find any reference to the incident you describe in that copy, and there was no copy of the newspaper on June 14, 1975. The propellor incident may have missed the newspapers completely.
Google News Archive Search - SMH