A millionaire fitness firm founder was killed attempting a British land speed record. Zef Eisenberg, who launched Maximuscle, died at Elvington Airfield, near York, where in 2006 ex-Top Gear presenter Richard Hammond crashed . Motorsport UK said the 47-year-old's car "went out of control at high speed at the end of a run" on Thursday. Guernsey-based Mr Eisenberg was involved in a "near-death" 230mph crash at the same airfield in 2016 . Motorsport UK said Mr Eisenberg was attempting to break the British land speed record in a Porsche 911 Turbo S when he was killed at about 16:30 BST . The organisation paid tribute to the "much-loved member of the motorsport community" and confirmed a full investigation into the crash had begun. The millionaire who pushed the boundaries of speed Mr Eisenberg left behind his partner Mirella D'Antonio and two children, it added. Sports nutrition firm Maximuscle said it was "devastated" at the news of the...