The plane I saw had 4 engines, forming a very short but broad trail, just like the one pictured.
It took a while to work that out as the vapour from each engine blended a very short distance from the aircraft.
It moved from northwest to southeast. It is the only time I have ever witnessed a daytime con-trail over Perth.
Mark, I see you're into RC thermal, where do you fly?
I used to hang around the KAMS Mundijong field years ago to watch the turbines, never did join tho as I was into the little speed400 park-fliers at the time. Kinda lost interest lately.
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