Engine starting was achieved by a combination of compressed air and a hand-turned magneto; however, starting problems were encountered during pre-race testing at Calshot due to moisture in the air and water contamination of the fuel. A complicated test procedure was devised to ensure clean fuel for competition flights since more than 0.3% water content made it unusable. As expected, minor engine failures continued to be experienced, and to counter this engines and parts were transported at high speed between Derby and Calshot using an adapted Rolls-Royce Phantom I motor car. Travelling mostly after dark, this vehicle became known as the "Phantom of The Night."