A friend frequented the dry lakes in the '50's & said the '28 & the '29 were the car of choice, as they had less frontal area & better front end aerodynamics. On full fendered cars, the bat winged front fenders on the'30 & '31 cars, would cause lift & you would literally "FLY"! Claude had experienced this, on a LOOOONG, STRAIGHT, downhill!!