In October 1961 a Cooper T53 owned by Cunningham appeared in the US Grand Prix. The entrant of record is the Momo Corporation, and the car was driven by Walt Hansgen, who crashed on lap 14 of his F1 debut. The chassis was later sold to Roger Penske and became the Zerex Special, then was resold to Bruce McLaren and became the first car raced by the McLaren team.