up to and speeds of up to . This project was briefly known as LOPGAP, short for "Liquid Oxygen and Petrol Guided Anti-aircraft Projectile", but soon moved from petrol to methanol which made the "LOP" inaccurate. LOPGAP The Fairey Aviation Company was at this time working on a missile project for the Ministry of Supply, Stooge. Stooge was more like an armed drone aircraft than a missile. It was flown to a location in front of the target and then cruised toward it until its warhead was triggered by the operator. Its low speed and manual guidance meant it was not useful for interceptions outside the immediate area of the ship, and thus did not meet the need for a longer-ranged missile capable of dealing with stand-off weapons. Accordingly, Fairey was ordered to stop work on Stooge in favour of LOPGAP. Development was slowed by the Air Ministry who were opposed to the project as it might take resources away from jet fighter production and a lack of urgency on the part of both the Admiralty and Ministry of Supply. A March 1945 report called for the first test launches of LOPGAP from converted QF 3.7-inch air-aircraft gun mounts within two months. The same mounts had also been used, with other modifications, for Stooge and Brakemine. They predicted the final system would be about long and a twin-launcher would take up about the same room as a twin 5.25-inch gun turret. An April Staff Target called for the system to be able to engage an aircraft flying at at altitudes up to with a maximum weight of . Move to RAE In 1945 a new Guided Projectiles Establishment was set up under the Controller of Supplies (Air) and in 1946 development of all ongoing missile projects moved to the Royal Aircraft Establishment's (RAE) new Controlled Weapons Department, soon to become the Guided Weapons Department. They began considering the beam riding concept in partnership with the Telecommunications Research Establishment (TRE), the deliberately oddly-named department of the Air Ministry responsible for radar development. Over the next year, first Brakemine and then Stooge were moved to the RAE. In a January 1947 Navy review, the program was given the name Seaslug. This called for a significantly larger weapon than initially envisioned, capable of single-stage vertical launch, a warhead (and guidance) of and an all-up weight of . Development continued as before but was