23 Sportster, a 57.5in span Ohlsson .23 powered free flight sport model circa 1949.
Quote: - "If sport flying is what you're interested in, this new different free-flight plane is right down your alley. Get out your '23' and start building... the 23 Sportster was designed around the popular mass-produced Ohlsson of that displacement. It is as large, and as small, as practical. Spanning a shade under 5 feet, it is about as small as you can go and still have sport performance from a good '23'. Anything larger - and the Ohlsson will fly a ship that is plenty bigger and heavier! - would be impractical for most builders. Few people like to transport clumsy airplanes and besides materials cost a small fortune..."
Update 31/12/2016: Added article, thanks to JeffMac.
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