The Bloodhound land speed challenger is likely to be back out on its South African lakebed track early next week. Engineers are now satisfied they understand why a heat alarm has been triggering on the car when it runs. Bloodhound was in the middle of trying to post a speed of 550mph (885km/h) on Friday when the sensor system alerted driver Andy Green that temperatures might be too high in the engine bay. He aborted, pulling up early having reached only 481mph (774km/h). Known as a “firewire”, the sensor is essentially two parallel wires running through a plastic sheath. This wiring criss-crosses the engine bay. When it gets too hot, the plastic melts and the two metal cores touch, triggering the alarm.