the previous three-year lifecycle. This system was adopted by the British F3 Championship in the 1990s and has since gained favour in many other F3 championships throughout Europe. It can provide an important entry point for drivers and teams without a competitive budget. After a 2014 season in which grid numbers ranged between nine and 14 cars, the series' organisers rejected a proposed merger with the British Formula 3 Championship with the intention of continuing the F3 Cup in 2015 under the name German Formula Open in order to circumvent FIA rules on national F3 championships which stipulate that they can hold no more than one round outside their home country (the organisers were planning to hold races at three meetings abroad as part of the support package for the ADAC GT Masters championship). However, in January 2015 it was announced that the series would not be held in 2015, although it was hoped that it could be revived in the near future. Chassis and engines Despite the fact that F3 is still an open formula for which any chassis builder or engine tuner can supply a product provided that it meets the technical regulations, most championships have just one de facto choice of chassis supplier – usually Dallara – and two or three popular engine suppliers – usually Mugen-Honda, Mercedes-Benz, Spiess-Opel, or TOM's-Toyota. The Formel 3 Cup has bucked this trend to become one of the most eclectic F3 championships in the world, with some of the variety that F3 enjoyed in the 1970s. In addition to the ubiquitous Dallaras, the Lola B06/30 and the SLC R1 from Signature have established a foothold. The SLC, which was the Signature team's first foray into chassis construction, had previously competed in the F3 Euroseries in 2005, but Signature chose not to continue using it. The Lola, which was developed after the British company's collaboration with Dome came to an end, has otherwise had only limited use in British F3 during 2006. Swiss Racing Team had provisionally lodged two entries for a pair of Mygale M06/F3 chassis in addition to a single Dallara entry. Before the start of the season, however, it had changed its line-up to four Dallaras, one of which was later replaced during the season with an SLC R1. During the 2006 season, a fourth chassis joined the series on an experimental basis. The Ligier JS47, which was built