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Waco 4 / Weaver 4
The WACO partners persevered, designing a practical three-seat biplane, the WACO 4, and building it out of parts left over from the Cootie and other biplane efforts. The team continued to assemble airplanes from parts salvaged from surplus World War I Curtiss Jennys, continuously tinkering with their designs and making improvements.
The 1921 Weaver 4 used many Curtiss JN-4 parts with new interchangeable wing panels and powered by a 90 hp (67 kW) Curtiss OX-5.
Selling for $4,000, the model 4 was the company's first public sale and the last of the all-wood Wacos.
One appearing in early registers as Waco 4 (NABCW) was actually a modified Hisso-Curtiss JN-4 Canuck with Brukner "high-lift" wings.
Engine: 90hp Curtiss OX-5
Wingspan: 28'0"
Length: 23'0"
Useful load: 890 lb
Max speed: 84 mph
Stall: 33 mph
Seats: 3-4

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