I tried to resist, but I couldn't. Here you have some Grand Prix cars that shouldn't be forgotten, all made before 1950, so they shouldn't be in this thread if they weren't so beautiful. Please, remember them, in case you have to desing a new car.
Bugatti Type 35, the most successful racing car in history: over 1.000 victories.
Mercedes Grand Prix, 1908: the first car to win a Grand Prix for Mercedes.
O.S.C.A., MT4, 1947, made by the Maserait brothers when they sold their shop. Villoresi won the GP of Napoli with it.
Allard, J2X, 1948. This car inspired Carroll Shelby, who drove it, to build the AC Cobra. First attempt, to my knowledge, to place an american engine in a british chassis, so, the power to weight ratio was amazing. I like it.
Cooper Climax. Do I have to say more? Yeah, yeah, it's post-1950, but who cares?
Ford GT40. It's not even a GP car, but I don't mind. By now, I'm out of bounds...
I should look for an HWM or a Lister, but that's enough.