Half-A Chaos (oz9211)


Half-A Chaos (oz9211) by George Chabot, Ted Bozanich 1975 - plan thumbnail

About this Plan

Half-A Chaos. Radio control sport model, for Cox TD .049 power. This design uses the Ace tapered foam wing.

Note this plan and the Half-A Stick (oz9212) both appeared together in the same RCM article, in July 1975.

Quote: "Two Half-A models designed with performance in mind. A hot, scaled down version of the popular Kaos (oz6251) and a Half-A Kwik Stik (oz6158). You can build them both in less time than it takes to lay up the wing on a sixty powered job. And once you put them through their paces, you'll have every guy at the field waiting his turn at the stick. By George Chabot and Ted Bozanich.

This is really a two-in-one article - featuring two Half-A aircraft with an ease of construction and a performance potential that will please the Sunday Flier or the guy who wants a quick building small aircraft that flies exactly like its .60 powered cousins - but at a far less expenditure of time and materials cost.

The first of the two is the Half-A-Chaos. Actually, what's more normal than a model of a model? The Kaos, designed by Joe Bridi, is one ofthe finest pattern ships ever built. We decided to scale this superb machine down to Half-A size in order to enable anyone to build and fly this ship from even the smallest of fields. We took into consideration all of the lengths and moments, wingspan, etc., and tied to combine all this into a small fun-type aircraft that would fly the pattern like the big one.

With a little assistance from Jim 'Banzai' Barnes, who loaned us the butchers wrapping paper on which to draw the plans, the Half-A-Chaos was born. All of the construction notes regarding the modifications to the Ace tapered foam wing is called out on the plans. Follow those instructions to the letter in order to achieve maximum performance from this little pattern machine. Insofar as an engine is concerned, we would recommend a Kim Kraft modified Cox TD .049 or .051 engine with oversized venturi, Kim Kraft Needle valve assembly, and crankcase pressure. If you don't mind a slight sacrifice in power and speed, a standard Cox TD .049 or .051 without pressure can be used.

So, without further ado, order the full size plans from RCM and let's get on with construction..."

Note this is a low resolution plan. Hopefully a clearer scan will surface at some point [Edit: better now]. Until then, for more detail see the supplement file, hogal's excellent PDFvector tracing.

Added PDFvector plan tracing, thanks to hogal.

Update 25/09/2017: Replaced this plan with a clearer copy, thanks to dfritzke.

Supplementary file notes

Article, thanks to hlsat, JHatton.
PDFvector plan tracing (hogal).


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Half-A Chaos (oz9211) by George Chabot, Ted Bozanich 1975 - model pic


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Download File(s):
  • Half-A Chaos (oz9211)
  • Plan File Filesize: 169KB Filename: Half-A_Chaos_RCM-607-A_oz9211.pdf
  • Supplement Filesize: 1733KB Filename: Half-A_Chaos_RCM-607-A_oz9211_article.pdf
  • Supplement Filesize: 168KB Filename: Half-A_Chaos_RCM-607-A_oz9211_vector.pdf
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