I had wondered the same! That's an interesting story. I have never heard them before but always wanted to. Thanks for posting.
Halcro update
Maybe old news for some, but I just chanced upon this article that helped clear up some things about Halcro that I hadn’t known. I remember back in 02 and 03 how they were the big and new and exciting kid on the block and then they vanished and now I know why. I’ve never heard or had experience with her equipment, but their design was quite interesting and knowing the physics behind it, or at least the physicist makes it even more intriguing.