To create Radar Red Top, De Haviland replaced the infra-red seeker of the original Red Top with a TR32 radar seeker. The rocket motor was solid fuelled and featured a longer burn to increase range. This gave the weapon a head-on engagement range of almost 16 miles with a maximum speed of Mach 3.3. The weapon was easily tailored to the existing Red Top armed aircraft it being quite easily tuned into the radar of the Lightning, Scimitar and Sea Vixen . The full capabilities of the weapon could only be achieved through the most modern radars however so while Lightning could fire the weapon after some modifications it was often at a reduced range and performance envelope.