Editing Avro Canada (section)

===Arrow Mk.3===
Even before the Arrow first flew, Avro was designing a future version, the Mark 3. Originally designed for Mach 2.5, later revised to an estimated Mach 3 with a combat ceiling of 70,500 feet, it carried more fuel, weighed over 25% more than the Mk.2, and made greater use of CNC machining and high-temperature aluminium alloys. Also proposed was a heat shield forming an ablative insulation made from carbon fibre or fibreglass in a honeycomb matrix, later used on [[NASA]]'s [[Project Mercury|Mercury]] and [[Project Gemini|Gemini]] programs. The engine was to be the Iroquois Mk.3, which Orenda estimated would provide 40,000&nbsp;lbs of wet thrust (with afterburner). Images of the design show revised engine intakes projecting out from the fuselage to swallow the supersonic shock wave to reduce drag and increase thrust. Also proposed was capability for "probe and drogue" aerial refuelling made possible by the Arrow's revolutionary flight stability systems.<ref>Whitcomb 2008, pp. 205–207.</ref>