 Additional developments of the Arrow were explored by Avro's Project Research Group under the leadership of Mario Pesando.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 aluminum alloys.