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. MLB Jerseys Outlet . -- Adrian Peterson takes a look around the league and sees big money flying everywhere. Cheap MLB Jerseys Authentic . Claude Noel will be the man behind the bench when the team hits the ice of the MTS Centre to begin its inaugural season. https://www.mlbjerseyschina.us/.B. -- Canadas Rachel Homan had ideal preparation for the playoffs at the Ford World Curling Championships with a pair of hard-fought wins over tenacious opponents Thursday. Fake Nike MLB Jerseys . McCutchen was cut before the series opener against Seattle on Monday night, when Lewis was set for his first start for Texas since July 18, 2012. Texas selected Lewis contract from Triple-A Round Rock. Cheap MLB Jerseys Nike 2020 . On Saturday night, Winnipegs strong offense was again accompanied by some fantastic pitching which gave the Fish a commanding victory.Jonathan Martin wants to play football again, but not with the Miami Dolphins. According to a report from ESPN, Martin feels he cant return to the Dolphins and likely wont play again this season. The report also stated that Martin is relieved to be away from the team after being picked on for the last year and a half. Martin left the Dolphins two weeks ago over allegged bullying and the league has since launched an investigation into the issue.dddddddddddd Fellow Dolphins lineman Richie Incognito has been suspended indefinitely by the team pending the investigation. As part of the CBA, Incognito can be suspended a maximum of four games, meaning the Dolphins will have a decision to make on the lineman on December 2. ' ' '