A way out of this dilemma was presented in the UK by Johanna Weber and Dietrich Küchemann around 1955. Their team at the Royal Aircraft Establishment (RAE) noticed that delta wings generated large vortexes over the wing when flying at low speeds and high angles of attack ("alpha"). The vortexes increased the speed of the air on top of the wing, thereby greatly increasing lift at low speeds. This effect was magnified by the length of the wing, and the sharpness of the angle of the leading edge - more sweep led to stronger vortex creation, more length gave it more room to operate over. This suggested that an aircraft with a delta wing running the majority of the length of the fuselage at very great sweep angles, over about 65 degrees, would have reasonable low-speed performance while also keeping the supersonic drag to a minimum through its limited span.