Racing motorbike with engine in reverse

July 30, 2015 //By Smart2.0
Racing motorbike with engine in reverse
Students of the Munich Technical University and the Tsinghua University have developed the T0RR electric racing motorbike. With features like 136 horsepowers, a top speed of 250 kmph (155 mph) and an engine torque of 240 Nm they intend to leave behind all competing bikes with combustion engines. For higher agility, the students used an odd trick.

A team of four German and four Chinese students built this black, large motorbike. The quartet took a BMW S1000RR, removed engine, clutch, transmission and electronic components and equipped it with an electric motor. The result is a sleek electric bike with a performance of 136 horsepowers and a top speed of 250 kmph. The goal of the team: To compete at the semi-professional Pro Thunder Race in Oschersleben, Germany. “We want the pole position and nothing else” clarifies project leader Frank Diermeyer. To get there, the T0RR must leave all conventional bikes in the dust behind. Therefore, the T0RR must offer full power at the push of a button. The bike gets its energy from a high-performance battery pack that can be discharged in particular short time which translates into the ability to offer its energy without any delay. “This is important to achieve high acceleration and at the same time high top speed”, explains Diermeyer.

Since during the race a very high side inclination is achieved, the bike needs a very highly agile handling with a low rotating inertia. To overcome the moment of gyration generated by the rotating wheels, the students figured out a kludge: They built in the electric motor in reverse, it moves in the opposite sense as the wheels. “By running the motor in reverse we get even better dynamics than conventional motorbikes”, explains Philip Wacker, the technological counsellor of the project.

The electric drive offers additional advantages. Since the motor is also used as a generator, it generates electric energy when it brakes. This recuperation effect, is very effective, the group said. Plus, the e-bike does not need a mechanical brake at the rear wheel which leads to considerable weight reductions. The best however is that the electric motor offers maximum torque at zero speed which translates into breath-taking acceleration.

The downside of the concept is that currently the battery does not hold

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