 Designed by Ron Tauranac, the BT26 was the final incarnation of his spaceframe F1 car, and one of the last F1 cars to be raced of such construction - forthcoming rule changes regarding fuel storage would outlaw spaceframe chassis.Tauranac had actually combined the spaceframe with stressed aluminium panels to create a semi-monocoque, enabling him to reduce the size of the spaceframe tubing and so lighten the chassis.The other main difference between the BT24 and the BT26 was a more powerful Repco 860 series engine, but it was also less reliable; the 1968 season was plagued by a string of retirements and Jochen Rindt left to join Lotus.