Question: Which Formula One car besides the Tyrrell P34 was one of the most radical entries ever to succeed in F1 competition, that used flat panel heat exchangers? 
Sentence (from "Tyrrell P34"): Along with the Brabham BT46B "fancar" developed in , the six-wheeled Tyrrell was one of the most radical entries ever to succeed in F1 competition, and has been called the most recognizable design in the history of world motorsports.
Relevant evidence: Yes