The Utter Chaos is an upgrade by Bridi of the Kaos/Super Kaos. The Killer Chaos is the latest of this development and features a side mounted engine. The closest thing to the original Kaos is the Sun Fli V which is the predecessor of the Kaos and basically the same plane. The Kaos was one of Joe's most successful designs and their continued popularity attests to their excellent flight characteristics. All of these are SPA legal and very competitive in the hands of an adept pilot.
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