Crash at Baragwanath of de Havilland DH.84 Dragon, ZS-AEF, c/n 6026 after it stalled on takeoff during a steep turn. Pilot William John Charles Kennedy-Cochran-Patrick and passenger Sir Michael Oppenheimer were killed. The aircraft was owned by Aircraft Operating Company which was established by William in 1931. He had a contract for a 20,000-square-mile (52,000 km2) air route survey in Northern Rhodesia (now Zambia).
More info can be found on Wikipedia:
http://en.wikipedia.org/wiki/William_Kennedy-Cochran-Patrick