HARDRIDER MOTORCYCLE MAGAZINE

only some parts of the frame remain as proof that the starting point once was the Y2K turbine motorcycle and even these are soon to be replaced. The cost of this project was estimated at around £200,000 (US$308,000) last year and since then it continues to evolve. Although originally the motorcycle was designed with aerodynamic carbon fairings, the team ultimately decided to go for a naked, streetfighter look, allowing for the turbine and all the technology used to be on full display. As soon as it was completed, Eisenberg created the Madmax Race Team and decided to take his creation for a try at breaking some speed records. In May 2014 at the Elvington Airfield in Yorkshire, UK, the fully-faired race bike, sponsored by Tag Heuer, broke the British Land speed record with a one way speed of 214 mph (344.4 km/h). In August 2014 in streetfighter form it set a new world record of 224.9 mph (361.9 km/h) over a mile from a standing start, which was ratified by the Auto-Cycle Union (ACU), the Speed Record Club and the Timing Association. The plan for this year was to return to Elvington for some more record breaking. This posed several problems that the team had to overcome. First of all they needed more power. The streetfighter bike has a drag coefficient of around 0.9 as opposed to the much sleeker 0.35 of the fully-faired race bike. After some careful calculations, they realized that in order to increase the top speed from 224.9 mph to the target of 231.7 (372.8 km/h), they had to come up with an additional 100 hp (75 kW). This was achieved with a lot of hard work and a special addition to the engine fuel system: a water/methanol injection system. Using a mix of 30 percent methanol and 70 percent water, a special order pump injects 1.4 liters (0.36 US gal) into the turbine inlet every 10 seconds at a pressure exceeding 200 psi. Holding enough for just 20 seconds, the team estimated this additional boost should cut it. The Madmax turbine streetfighter that turned up at Elvington was by now producing an estimated 542 peak horsepower (404 kW), with a torque of at least 450 lb-ft (610 Nm) at maximum rpm. These performance figures are not 100 percent accurate because the motorcycle proved to be too brutal for any dyno to handle. The latest attempt was on May 13, on a Dynojet 250 equipped with an Eddy Brake system. The bike was strapped down with 150 kg (331 lb) of force on each side in a bid to achieve maximum traction for the 240/ 40-18 rear wheel. Despite every measure taken, at around 80 percent throttle the rear wheel started to spin on the dynos 750 kg (1,653 lb) grooved steel roller. That would be the inescapable result of too much torque. When the bikes ECU calculated a perceived acceleration from 190 to 240 mph (306 to 386 km/h) in just one second at the rear wheel, it shut down the turbine as it was designed to do as a safety precaution. Mind you, this happened before using the water/methanol boost! As of May 17, Madmaxs turbine streetfighter, at the hands of Zef Eisenberg, is the proud holder of three world records and one British national record: 1 - Worlds fastest Turbine Motorcycle 1 mile (one way): 233.7 mph (376.1 km/h) 2 - Worlds fastest Streetfighter 1 mile (one way): 231.6 mph (372.7 km/h) 3 - World’s fastest flying quarter mile for Turbine Motorcycle: 3.91 sec 4 - Britains fastest Naked Motorcycle (Official ACU two way average): 225.6 mph (363.1 km/h) All these were achieved in road legal trim, as the motorcycle is registered for road use. The 500+ HP Turbine Engine

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