The development of the DW12 was driven by IndyCar's ICONIC Plan (Innovative, Competitive, Open-wheel, New, Industry-relevant, Cost-effective), initiated in 2010. This plan aimed to introduce a new, cost-effective, and safer chassis for the series. A committee of experts and executives, including former Indy 500 champion Gil de Ferran and motorsport figures Tony Purnell and Brian Barnhart, oversaw the process. IndyCar accepted proposals from several manufacturers, ultimately selecting Dallara's design in July 2010. The ICONIC regulations mandated a core rolling chassis, known as the "IndyCar Safety Cell," which teams would then outfit with manufacturer-specific aerodynamic bodywork, termed "Aero Kits." This approach was intended to foster competition and innovation while controlling costs. The new chassis and engines replaced the 2003/2007-model Dallara IR-05s used through the 2011 season.
The DW12 chassis, formally named the Dallara IR-12, was designed with enhanced safety features. These included a partial enclosure around the rear wheels and a redesigned front section aimed at preventing severe single-seater crashes. The car's nomenclature, DW12, was established in honor of Dan Wheldon, the chassis' test driver and namesake, who tragically died in the final race of the previous IR-05 season. This naming convention mirrored that of the former Formula One team Ligier, which labeled its cars JSxx after driver Jo Schlesser.
Under the ICONIC regulations, the IndyCar Safety Cell was capped at a price of $349,000 and assembled at a new Dallara facility in Speedway, Indiana. Aero Kits were capped at $70,000, with teams able to purchase a combined safety cell/aero kit at a discount. Initially, all teams were intended to use a universal Dallara aerodynamic package for the 2012 season, with the introduction of multiple manufacturer Aero Kits delayed until 2013 for economic reasons.
Dan Wheldon conducted the first official test of the Dallara chassis at Mid-Ohio in August 2011. Following his fatal accident at Las Vegas Motor Speedway in October 2011, Dallara announced the chassis would be named the DW12 in his honor. The car's race debut occurred at the 2012 Honda Grand Prix of St. Petersburg on March 25, 2012, where Hélio Castroneves of Team Penske secured the first victory.
From 2012 to 2014, teams utilized the Dallara-provided universal aero kit. For the 2015 season, Honda and Chevrolet introduced their own in-house designed Aero Kits, developed in partnership with Wirth Research and Pratt & Miller, respectively. The Chevrolet aero kits initially held an advantage, with Chevrolet teams winning most races in 2015. However, three Chevrolet entries experienced dangerous flip-over crashes at the Indianapolis 500 that year, leading to safety examinations and modifications.
In response to these incidents and to enhance safety, domed skids were introduced in 2016, along with Zylon bodywork tethers to prevent loose parts from striking other competitors, a measure prompted by the death of Justin Wilson. Both manufacturers also updated their aero kits. The Honda kit saw significant changes, including alterations to the front wing and the introduction of new sidepods and rear wing endplate vents. The Chevrolet Aero Kit was less dominant in 2016 compared to the previous season. A developmental freeze was implemented for the 2017 season in preparation for a new universal aero kit.
The introduction of manufacturer aero kits in 2015 led to safety concerns, particularly after flip-over incidents at the 2015 Indianapolis 500 involving Chevrolet-powered cars. These events prompted safety examinations and modifications to qualifying rules. In 2016, further safety measures were implemented, including domed skids and Zylon bodywork tethers, following the fatal accident of Justin Wilson.
The DW12 chassis has been a cornerstone of the IndyCar Series for over a decade, with its longevity exceeding that of previous chassis. The introduction of manufacturer Aero Kits from 2015 to 2017 fostered distinct visual and performance characteristics among the competing brands. In 2018, the DW12 received a significant aerodynamic redesign with the UAK-18 (Universal Aero Kit 2018), which aimed to increase downforce from ground effects and drew inspiration from classic Indy car designs of the 1980s and 1990s. This universal kit allowed for greater cost savings for teams, as the same chassis could accommodate aero kits for different track types. The DW12 platform has also been adapted to incorporate advanced safety features, including the Aeroscreen, which was introduced for the 2020 season to further protect drivers. The chassis is slated to be replaced by the Dallara IR-28, with its introduction delayed to 2028.
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