The Killer , Utter, etc. were marketed after Joe Bridi sold the rights to the original design
so there had to be some subtle design and name changes (Chaos), different shaped rudder ,
canopy etc. but they all flew good because most of the original design elements were
still there. When the original Kaos first came out there were no ARFs and it could take a
few months to build a pattern plane but the Kaos could be built in a few weeks , good simple
design that flew good.
If you build one try to keep it light.

tommy s