Body
The Trabant P 50 is a small, two-axle car with a self-supporting body, a front engine, and front-wheel drive. It was made in two body-styles, two-door saloon (Limousine) and three-door estate (Universal); the estate version was also available as a panel van without rear windows. As seen on several other contemporary estates, the Trabant P 50 estate has a side-hinged rear door. The Trabant body has a skeleton-like steel frame with body panels made of duroplast, a material made from cotton waste and phenol resins. Instead of a regular grille and a radiator, the Trabant P 50 has small cooling vents below its headlamps. The bonnet is bent around the front, and reaches down to the front bumper. The drag coefficient (cd) of the P 50 body in the saloon form is 0.55…0.60.[6] VEB Sachsenring offered the car with a pastel-coloured paint as standard, and with a three-colour paint as a factory option. The pastel colour was chosen because it was easy to repaint.[7]
Engine
VEB Sachsenring Automobilwerke Zwickau installed a VEB Barkas-Werke-made P 50-series engine in the Trabant P 50. In total, four different versions of the P 50 series engine were used, the P 50, P 50/Z, P 50/1, and P 50/2. The standard P 50-series engine is rare, with only 2,530 units built. It is followed by the P 50/Z engine with 13,733 units, the P 50/1 with 125,727 units, and the P 50/2 with 25,127 units.[8] All P 50-series engines share the same design. They are air-cooled, two-cylinder, two-stroke petrol engines with a rotary intake valve, cross-flow scavenging, a simple crankshaft with three anti-friction bearings, and a horizontal draught carburettor.[9] Its engine block is made of grey cast iron with either iron cooling fins (P 50 only) or cast-on aluminium cooling fins (P 50/Z, P 50/1, P 50/2); the latter is referred to as the Alfer design (Aluminium-Ferrum). The bore is 66 mm with a piston stroke of 73 mm. The engines' compression is low, with an ε-number in the 6.7…7.2 range. This design allows them to run on petrol with a research octane number of just 72. For engine cooling, the P 50 series engines are fitted with a belt-driven fan.[6] With a P 50 series engine, a Trabant can reach a top speed of around 90 km/h, with a fuel consumption of approximately 8 L/100 km.
Drivetrain
The torque is sent from the engine to the gearbox with a single-disc dry clutch. All Trabant P 50 cars were fitted with a four-speed manual, column-shifted gearbox. The gearbox fitted from 1957 until mid-1962 has no synchroniser rings and thus requires double-clutching. All gears were equipped with a lockable freewheeling device so the engine can run independently from the wheels. This allows the engine to idle while being in gear without having to depress the clutch pedal. As the engine has no oil pump – it is solely lubricated by its fuel – coasting in gear without a freewheeling device would cause insufficient lubrication and thus engine failure. From summer 1962 until its production end in September 1962, the Trabant P 50 received a new four-speed gearbox with a slightly different gearbox spacing. Most importantly though, the gearbox was fitted with synchroniser rings, and only the fourth gear was fitted with a freewheeling device. Unlike in the old version of the gearbox, the freewheeling device is permanently activated and cannot be switched off to prevent engine failure caused by erroneous freewheeling device operation. From the gearbox, the torque is sent to the front wheels.[10]
Suspension
The Trabant P 50 has independent front, and rear suspension. In rear, it has a simple swing-arm axle with two single wishbones (one for each wheel), and a single transverse leaf spring (one for both wheels). In front, the wheels are controlled by two single wishbones (one for each wheel), and a single transverse leaf spring (one for both wheels). All wheels are fitted with hydraulic shock absorbers. The steering system is a rather precise rack-and-pinion system that, due to the car's small size, is not power-assisted. VEB Sachsenring installed 4J × 13 in wheels with 5.20–13 in tyres. The car has a ground clearance of 150 mm and a turning diameter of 10 m. The P 50 has hydraulically operated 200 mm drum brakes on all four wheels.[10]
