The Napier Scorpion was a British liquid-fuelled rocket aircraft booster engine developed and manufactured by Napier. It used hydrogen peroxide / kerosene propellant.
The first Scorpion NSc.1 was successfully flight-tested in a Canberra.
From 1956 the Double Scorpion NScD.1 was fitted experimentally to two Canberra light bombers, to improve high altitude performance. A world altitude record of 70,300 feet (21,427 m) was set by Canberra WK163 on 28 August 1957.
The Scorpion project was cancelled in February 1959, at a reported total cost of £1.25 million.