The design foundations of the new McLaren Spider are the seamless and organic forms introduced in 2017 with the 720S Coupé. Combining to maximise downforce, minimise drag, enhance powertrain cooling and optimise aerodynamic performance, these shapes produce an overall appearance akin to a futuristic sculpture, formed by the air that flows over, under, around and through it. A new, electrically actuated Retractable Hard Top (RHT) is seamlessly integrated into the design, as are new buttresses.
Carbon fibre core for strength and light weight
Like all McLaren cars, the new 720S Spider has a carbon fibre structure at its core, in this case designated Monocage II-S. The strength, rigidity and light weight of the McLaren Monocage is the base for the dynamic for which McLarens are renowned. The Monocage II-S is a development of the Coupé ’s Monocage II, without the central ‘spine’ running front to rear above the cabin. The rearmost section of the upper structure is also unique to the Spider, to accommodate the retractable hard top; additionally, the header rail across the top of the windscreen has been revised, to integrate the central latching mechanism.
McLaren’s engineering ingenuity, underpinned by the inherent strength and rigidity of carbon fibre, means that despite the removal of the fixed roof there is no need for additional strengthening; even the unusually slim but incredibly strong windscreen A-pillars first seen on the 720S Coupé remain. To provide enhanced rollover protection for occupants, fixed carbon fibre structural supports are integrated into the rear of the Monocage II-S, additionally providing the main anchor points for the roof system and the seatbelts. In the first-generation Super Series, steel supports featured and the switch to carbon fibre has contributed to the Rollover Protection Structure (ROPS) in the 720S Spider being 6.8kg lighter than in the 650S.
Overall, the new 720S Spider is just 49kg – or less than 4% – heavier than the 720S Coupé. The increased weight is primarily associated with the RHT and tonneau system. With a lightest dry weight of 1,332kg the 720S Spider is comfortably the lightest car in its competitive set, at 88kg less than the 1,420kg dry weight of its closest rival. The low weight is the foundation for the dynamic, performance and efficiency benefits that McLaren is so adept at exploiting for the greater enjoyment of its customers.
Glazed flying buttresses aid rear visibility, enhance visual drama
The canopy-like design of the 720S Coupé is recognised for the sense of 360-degree vision it provides, allowing light to flood into the cabin and setting a new benchmark for visibility. This philosophy of unrivalled vision is central to the second-generation Super Series and the new Spider moves the game on again, with unique, glazed flying buttresses further aiding driver visibility as well as adding visual drama to the car.
The leading edge of the buttress features an aerodynamic carrier to guide airflow, before dramatically tapering off to expose darkened glazing; the design and the use of glass delivers a 12% improvement in over-the-shoulder visibility compared to the previous McLaren Super Series Spider.
To accommodate the Retractable Hard Top, the Monocage II-S features a new carbon fibre upper structure engineered to sit as close as possible to the air charge coolers and intake plenum. This maximises luggage space; there is 58 litres of stowage available under the tonneau cover with the roof raised. The tonneau cover also sits lower than that of a 650S Spider – again by 25mm – extending visibility by 7.5m in length.
Patented, one-piece Retractable Hard Top is fastest-operating supercar convertible roof
The Retractable Hard Top (RHT) of the 720S Spider is a completely new design, with a one-piece, carbon fibre roof panel as standard. The hardtop maintains the distinctive silhouette and aerodynamic purity of the 720S Coupé and provides a full carbon fibre upper structure when the roof is closed. The folding mechanism for McLaren’s new RHT is electrically rather than hydraulically driven and the system is the fastest-operating convertible roof in the supercar class, with the retractable hard top lowered or raised in just 11 seconds – six seconds quicker than the 650S Spider. The combination of e-motors and the strength and light weight of the carbon fibre RHT enables a maximum vehicle speed during operation of 50km/h (31mph) – a significant increase from the 30km/h (18.5mph) of the 650S. With these performance statistics, it is no surprise that McLaren has registered three worldwide patents for the roof system.
Industries: Automotive and Road Transportation