A Burt strut, or timing strut, is a black, rectangular plate attached to the front of a competition vehicle, usually a racing car, to provide a standardised, repeatable method by which to break a timing light beam at the start and finish of events timed to high-degrees of accuracy. These events are commonly those in which competitors race against the clock, rather than physically against another vehicle, such as sprint or hillclimb races. The strut was invented in 1967 by Ron Smith; manager, chief mechanic and future husband to 1970 British sprint champion Patsy Burt. As the strut made its first appearance on the front of Burt's McLaren-Oldsmobile her name was used as its official title. In recent years the generic term timing strut has also become common.