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In response to your quote - I was just on the Prism website - unless something has changed, they are still in production. Might be harder to find, but still made.
After reading other threads - that may be out of production. I see on the Kite Shoppe website, that she has one. Slight sail discoloration and discounted $40.00 USD. Don't know about shipping and taxes, maybe the discount makes up for some of it? She is one of this site's sponsors, look under Ultralight Wind Range to see it.
That was easy. Good old Wikipedia. Bell wanted a kite that was both strong and stable enough to carry people. He worked up to one with (wait for it) 3393 cell weighing 90KG. Some kite.
Bell's experiments in manned kite flight did not, it seems, represent a great leap forward either in kite design or in the way we move from A to B.
I wonder if all famous inventors CVs are a mixture of the good stuff that made them famous and some the crazy, pointless stuff that no-one talks about? I bet they are. 🤪
Is there an advantage to that shape, other than it being good fun? Is it more stable? Does it have more lift? It certainly doesn't look easier to store, assemble, launch or land. Bell used them for aerials I suppose. He must have been dissatisfied with the existing kite designs for some reason? I'll google it.