Tobias Hinzmann was kind enough to submit a couple of very interesting videos showing some work he has been doing in regards to angular momentum using high quality super slow motion videos. I posted them here because I thought they were very well done. He obviously put a ton of work into these. I thought they would be of value to anyone interested in the finer mechanical engineering aspects of what happens when we cast a fly line on a rod. Although he uses overhead casting (because its way over my head) some of the principles of overhead and spey casts are similar.