Never mind, but when I found out that he built them himself I was all excited. He gave me the drawings about it, and I built several. The material was thick plywood.
It was supposedly for my two kids, but I am a child of the heart myself, so it was for me too. We went to a nearby park and I quickly got the hang of throwing one that came back.
It came back alright and hit me hard on my hip! Just as well I did not kill myself by it hitting me in the head.
Imagine the newspaper report on a mother who killed herself with a boomerang in front of her children.
Well, it did not happen, I only had some bruises on my side. Later I made one for my nephew. And then our car broke down far from home, and friends picked us up, while we had to leave the car to be picked up later. We could not take everything with us that we had brought on our outing, so had to leave it.
Guess what got stolen? One of my boomerangs.
I have not made any since, because we always seem to have been too close to buildings, and now trees.
This engineer knew about aerodynamics of course, but which person, in which country and at what time would have known about it? Is there anything in nature similar? Maybe it was an accident, when carving a normal hunting boomerang.