firmly welded to the floor panels and which covered the linkage to the brakes, gearbox, etc. The front of the car had a basically rectangular cross section and was rounded all the way to the floor. The front bumper covered the rounded fenders, while the lower halves of the lights were embedded in the bonnet. The rear of the car had a continuously sloping form and was divided by a vertical fin which started at the rear end of the roof and ended almost at the rear end of the car. The rear wheels had aerodynamic covers. The door handles were embedded into the door panels, from which only the door hinges protruded slightly. The car had no rear window, limiting rear visibility to what could be discerned through slits in the sheet metal. The first prototype of 1933 had a split windscreen, while other prototypes had a single-piece windscreen or even one formed from three separate pieces of glass with one large central piece and two side parts angled sharply and flowing into the sides of the body. Air was directed to the engine by rectangular ventilation inlets behind the side windows, and exited the engine compartment through vents at the rear. At the time, Tatra registered numerous patents regarding air flow to the rear engine compartment. Later the rear part of the body was widened so that both the rear fenders and door hinges were embedded into the bodywork itself. The air now flowed through transverse inlets which were raised above the rear of the rounded roof. The trailing edge was also raised. Tatra 77a In 1935 the T77 was updated and improved, which resulted in the T77a. The capacity of the V8 was increased to 3.4 L (207 cubic inches). This was achieved by enlarging the bore diameter from . The new motor increased output to and maximum speed to . The front now had three headlamps of which the central unit was not, as has been suggested, linked to the steering on some models. The central headlight never moved with the front wheels, but had an electro-magnetic system enabling the reflector to move to illuminate the kerbs, as street illumination was poor at the time. Some T77s and T77a models were also equipped with canvas Webasto roofs. The smooth body of the T77a gave a coefficient of aerodynamic drag of 0.212. Some sources, though, claim that