The new Rolls-Royce Dawn convertible has been unveiled just ahead of the 2015 Frankfurt motor show.

A vehicle that Torsten Mueller-Oetvoes, CEO of Rolls-Royce Cars, describes as the "sexiest Rolls-Royce ever built".

According to Mueller-Oetvoes, the name Dawn was chosen as it "perfectly suggests the fresh opportunities that every new day holds", as well as hinting at the "early-day chill of dawn [which] provides an erotic tingle on the skin, awakening the senses and passions as the day begins".

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Although the Dawn shares the same 3112mm wheelbase as the Wraith coupe, the luxury car maker emphatically states that the Dawn is "is not a Wraith drophead" and that 80 percent of the convertible's body panels are unique.

Changes include a grille that's recessed by 45mm, a redesigned front bumper that's 53mm longer, and "sensuous hips" that envelop a rear track that's 24mm wider than on the coupe. The largest carry over element are the rear-hinged front doors, which should aid ingress and egress to the rear seats.

The Dawn rides on 20-inch alloy wheels fitted with run-flat tyres; 21-inch wheels are an optional extra. Rolls-Royce says that the Dawn's roof is able to raise or lower itself in 20 seconds at driving speeds up to 50km/h. With the roof up, the Dawn is said to be as quiet as the Wraith coupe and the "quietest open top car ever made".

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A direct-injection 5.6-litre V12 with 420kW of power and 780Nm of torque is tasked with moving the Dawn's 2560 kilogram body around, while an eight-speed satellite-aided automatic transmission is standard. The Dawn is said to be capable of 0-100km/h in 4.9 seconds and an electronically limited top speed of 250km/h.

The Dawn's infotainment system features a 10.25-inch high-resolution screen that's controlled by either a rotary knob or a touchpad that can recognise gestures, as well as Latin, Arabic and Chinese character inputs.

Safety tech includes a concealed roll-over protection system, head-up display, adaptive LED headlights, and a night-time heat detection system that can monitor for road-side humans and animals.