Editing Avro Canada (section)

===Space Threshold Vehicle===
Developed by the Advanced Projects Group, a June 1958 report by Avro's Engineering Department described a Space Threshold Vehicle intended to "get a man into the threshold of space and recover him, flying back through the corridor", where winged flight was possible between maximum altitude that could sustain lift from a winged vehicle and maximum tolerable structural temperature.<ref>Whitcomb 2002, p. 236.</ref> This was estimated to be an altitude of between 150,000 and 200,000 feet. The STV would have had capability for in-flight refueling, and an expected speed of 6,000&nbsp;mph (Mach 8.5+).<ref name="Whitcomb 2002, p. 241">Whitcomb 2002, p. 241.</ref>

Avro's computer capacities provided capability in developing theories and methods similar to modern three-dimensional modeling of fluid dynamics. Avro envisioned a delta-shaped vehicle with downward winglets (similar to the [[TSR-2]]'s), varying engine nacelle positions, titanium skin, and first flight of a research vehicle in 1962. Many engineers involved in this and similar Avro designs were later heavily involved in NASA Projects Mercury, Gemini, and Apollo.<ref name="Whitcomb 2002, p. 241"/>