The Mildren Waggott was a space frame open wheeler racing car built by Bob Britton for Alec Mildren Racing, as one of a number of cars built to the Rennmax BN3 design, which itself was derived from the Brabham BT23. Originally powered by a 1.6 litre Alfa Romeo engine, the car was driven by Max Stewart in the 1969 Tasman Series and was subsequently fitted with a 1.6 litre Waggott. Stewart drove the car to victory in the 1969 Australian Formula 2 Championship, the 1970 Australian Formula 2 Championship and the 1971 Australian Drivers' Championship, with a 2.0 litre Waggott engine being used to win the third title.