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The Stig breaks into Lotus F1 HQ

As Top Gear's mysterious test driver, The Stig has driven just about everything on wheels - and more than a few things without. But an F1 car? That still remains a rarity, even on Top Gear.
That all changes in this latest promo clip, though. The video shows what happened when his Royal Stigness arrived at the headquarters of the Lotus F1 team in Enstone, England, where he somehow managed to scan his way in past security and got his hands on a Lotus-Renault E21, the V8-powered single-seater that Kimi Raikkonen and Romain Grosjean drove in the 2013 Formula One World Championship - and which the Stig will apparently be driving on stage during the upcoming Top Gear Festival in Durban. If you're not heading to South Africa this month, though (or even if you are), you can check out the footage in the video below.

This is how ground effects work in a nutshell

There are two ways to generate downforce. One is with all manner of wings and spoilers on the surface of the vehicle. The other is with ground effects. One you can clearly see, the other remains something of a hidden mystery. Fortunately, the good folks at Lotus and Goodwood are here to dumb it down for us non-engineer types. It's called Bernoulli's Principle, named after Swiss physicist Daniel Bernoulli who literally wrote the book on the subject way back in the 1700s. Countless engineers have spent their careers focused on its study and application, but the crux of the matter is that, as the speed of air (or other "fluid") increases, pressure decreases. Play with the air's increasing speed and decreasing pressure just right and you can generate downforce underneath the body of a car without significantly increasing drag as you would with surface spoilers. For evidence of how Bernoulli's Principle applies in practical terms, just look at the last Ferrari to pack a turbocharged V8 in the middle and the latest one. The F40 had a giant wing on the back, where the 488 GTB has none. But because the 488 uses underbody aerodynamics (or "ground effects"), it generates significantly more downforce than the winged F40 ever could, and at lower speeds. Ferrari, however, was not the first outfit to harness the power of ground effects. Lotus did with the legendary 79 that Mario Andretti drove to the world championship back in 1978. That was the genius of Colin Chapman, and to explain how it all works in layman's terms, our friends over at Goodwood Road & Racing brought in Colin's son Clive Chapman, head of Classic Team Lotus, to put together the video above. Related Video:

The new Lotus Evora GT430 Sport is quicker with an automatic

Few automakers exploit platform variants as much as lotus. The company has four models, one of which is essentially a hardtop version of another. The Lotus Evora 400 sits atop the range, and since its debut last year we've seen the Evora 410, Evora 410 GP Edition and the Evora GT430. Today, the British automaker announced the Evora GT430 Sport, essentially a less hardcore but nearly as capable version of the GT430. The two biggest differences are the non-limited availability and the available six-speed automatic transmission. All 60 examples of the GT430 were only available with a manual. Both cars use the same 3.5-liter V6 topped with an Edelbrock supercharger that's good for 430 horsepower. Manual models make 325 lb-ft of torque, while automatic-equipped cars make 332 lb-ft. Despite a 24-pound penalty, the GT430 Sport automatic hits 60 mph in 3.6 seconds, a tenth quicker than the manual. While gearing in the automatic limits top speed to 170 mph, manual models can reach 196 mph. That makes this the fastest road-going Lotus ever. No matter which one you choose, the GT430 comes with Ohlins TTX two-way adjustable dampers, slotted and ventilated brake discs with AP Racing four-piston calipers, a Torsen-type limited slip differential and an adjustable traction control system. The front and rear bumpers, front access panel, roof panel, rear quarter panels and one-piece louvered tailgate and spoiler are all made of carbon fiber. The non-Sport GT430 adds a carbon fiber front splitter, rear wing, louvered wheel arches and a wider set of wheels and tires. The carbon fiber theme continues inside. The seats, door sills and parts of the instrument cluster are all made of the lightweight material. Most of the rest of the interior is trimmed in leather and black Alcantara. At $136,000, the new GT430 Sport undercuts the limited-run model by about $11,000. There's no word on if the car will make it here to the U.S. Hopefully Lotus' new parent company will keep the ball rolling. Related Video: