Great stuff guys, thanks for your posts. Its interesting, the thing that killed the Can-Am series was the same thing that is happening in modern Formula 1. The SCCA started enforcing more restrictive aerodynamic rules, particularly when Hall began racing the Chaparral 2J in 1970. The Can-Am allowed huge freedom in aerodynamics, some of which was successful, and some not.

But once they started restricting the aero, it placed greater emphasis on engines. It then became a prerequisite to either be a car manufacturer, or team up with a car manufacturer, and build more advanced engines with bigger horsepower. With restrictions on aero, engines were the only area where a team could gain an advantage. When Penske teamed up with Porsche and built the 917/10 for 1972, it killed the Can-Am. McLaren knew they couldn't compete, because they weren't teamed with a car manufacturer. So they quit.

The same thing is happening in modern F1, with its power units. Aero is no longer king, its horsepower. Mercedes-Benz has the best engine, and therefore the best car. They only supply their engines to teams they know can't beat them. But it no longer matters how good a cars aero is. If it doesn't have the right engine, it can't win.

Funny how history repeats itself, and people don't seem to learn.