Around 25 million copies of this book have been sold. I suspect that less than 100 people actually made any sense of it. Like you, I’m not one of them.
It must have been about thirty years ago when I first read it but frustratingly had forgotten the title of the volume.
To cut a long story short I was on a course last week when the subject of helicopters cropped up.The fella I was chatting to was able to refresh my memory.