JEREZ, Spain -- Red Bull has unveiled the car it hopes Sebastian Vettel will steer to a fifth consecutive Formula One world championship, adapting to a major switch to six-cylinder engines. Four-time defending world champion Vettel and new teammate Daniel Ricciardo pulled the tarp off the RB10 on Tuesday at the Jerez circuit, just before the start of preseason testing on Tuesday. They then posed for photos with team boss Christian Horner and chief designer Adrian Newey. F1 tweaks the rules governing the engineering of cars each season, but this years changes have required a major change in design. That has led to speculation Red Bull may have trouble to extend its four-year dominance of the competition, which last year saw Vettel match Michael Schumachers record of 13 wins in one season as he cruised to the title. Red Bull said its new car is "our first interpretation of F1s radical new technical regulations" and that it "has little in common with its predecessors." Besides switching to a 1.6-litre V6 turbo engine instead of last years 2.4-litre V8 engine, the rule changes focus on boosting cars energy recovery systems, which generate energy from braking and through waste heat from the engine. F1 has also lowered fuel to 100kg per race, down from 160kg, increased the cars weight, and forced alterations to gearboxes, exhaust, nose height and wings. Mercedes and Force India also presented their cars for the new season in chilly conditions in southern Spain on Tuesday morning. Toro Rosso, Red Bulls sister team its uses to develop drivers, launched its car on Monday. Driver Jean-Eric Vergne said that the new rules means more excitement for a competition that has been owned by Vettel. "Probably (the engine) will make it (the field) a little bit more apart - maybe even closer. I really have absolutely no idea," said Vergne. "No one in the team knows if they are in the right direction or not. It is so easy to get it wrong this year that not even after the first test in Jerez." Preseason testing continues here until Friday. The next tests will be held in Bahrain on Feb. 19-22 and Feb. 27-March 2. The season opens with the Australian Grand Prix on March 16. Radek Faksa Jersey . -- Packers cornerback Tramon Williams has been fined $26,250 for contact with an official, per NFL guidelines. Jamie Benn Jersey .J. -- Having Ondrej Pavelec earn his 100th NHL win and seeing Mark Scheifele and Evander Kane break goal droughts were nice highlights for the Winnipeg Jets. http://www.thedallasstarshockey.com/gump-worsley-hockey-jersey/ . In the calls, Hernandez discussed the murder of Odin Lloyd, including his "belief about his criminal liability" and the "extent of his control over persons charged as accessories," according to the request filed Thursday in Fall River Superior Court. Jon Casey Stars Jersey . The Spanish champions decision not to sign a defender during the January transfer window may have backfired after Valencia took advantage of a lethargic, uninspired effort by its hosts at the Camp Nou, where former Spain coach Luis Aragones -- who previously coached the Catalan side -- was honoured after his death on Saturday. Dino Ciccarelli Jersey .S.-Cuba relations means baseball prospects get off the island and into the major leagues without payoffs to smugglers and threats from kidnappers, its hard to see the downside.ST. PETERSBURG, Fla. -- Kansas City Royals left-hander Jason Vargas has been taken to the hospital and will have an appendectomy. Royals manager Ned Yost announced the news before Wednesday game against Tampa Bay and said surgery was planned for Wednesday night. Yost says Vargas "started really having severe discomfort" around 4 a.m. Wednesday There was no timetable given for how long Vargas will be out. Bruce Chen could replace Vargas in Sundays game against Detroit.dddddddddddd Royals All-Star outfielder Alex Gordon was scratched from Wednesdays lineup due to a sprained right wrist. He will have an MRI exam and see a hand specialist Thursday when the team returns to Kansas City. Yost said the injury could "very well" impact Gordons status for next weeks All-Star game. Kansas City third baseman Mike Moustakas was also out of Wednesdays lineup with the flu. ' ' '