We've come to expect drop-top supercars to make their debut about a year after the unveiling of their hard-top predecessors. Now, I don't want to say that Lamborghini is being predictable here, but it was exactly one year ago that Lamborghini showed off the RWD Hurac\u00e1n. Today, here comes the Spyder.Officially called "Lamborghini Hurac\u00e1n Rear-Wheel Drive Spyder" (the clunky LP-naming conventions are no more) this car has the same 580-horsepower V10 as the hardtop version, but in a slightly heavier package thanks to the reinforcement required when ripping the top off a thing, plus the mechanicals associated with the power-operated soft-top. At 3,300 pounds, it is about 70 pounds lighter than the all-wheel driver flavor of the Hurac\u00e1n Spyder, and with most of that weight coming off the nose, it now rolls with a 40\/60 front\/rear weight distribution.That lighter nose should make for more nimble handling, but the lack of AWD does hinder acceleration. The sprint to 62 takes 3.6 seconds, two tenths slower than the AWD car and a tenth slower than the coupe. Still, with an extra-aggressive new nose and the extra joy of driving RWD-supercar, I don't even think you'll notice.