
In 1971, Mark Donohue, driving the new Penske-owned McLaren M16, became the first person to lap the Indianapolis Motor Speedway in under 50 seconds (a speed of 180.977 mph). Donohue appeared to have the field easily in hand on race day when, on lap 66, the McLaren’s gearbox broke, allowing Al Unser’s Eagle to take the victory.
Photo: Pete Lyons








