In 1967, back at Lotus, Hill helped to develop the Lotus 49 with the new Cosworth-V8 engine. It fell to Hill to perform the initial testing of the new car and its engine. After the first shakedown run, Hill quipped "Well, it's got some poke! Not a bad old tool." After teammates Jim Clark and Mike Spence were killed in early 1968, Hill led the team, and won his second world championship in 1968. The Lotus had a reputation of being very fragile and dangerous at that time, especially with the new aerodynamic aids which caused similar crashes of Hill and Jochen Rindt at the 1969 Spanish Grand Prix. A crash at the 1969 United States Grand Prix at Watkins Glen broke both his legs and interrupted his career. Typically, when asked soon after the crash if he wanted to pass on a message to his wife, Hill replied "Just tell her that I won't be dancing for two weeks."