IndyCar Aerodynamic Body Kits Revealed Side-By-Side

Verizon IndyCar Champion Will Power, tests the Dallara/Chevrolet/Penske aerodynamics body elements on the track at Circuit of the Americas near Austin, Texas. Image Credit: IndyCar

IndyCar Aerodynamic Body Kits Revealed Side-By-Side (kinda')

The evening of Monday, March 10, 2015 saw the final reveal of the aerodynamics body panels (Front Wing, Sidepods, Rear Wing) for the beginning of the third season of the Dallara DW12 chassis.

Chevrolet introduced its road course/street course and short oval design Feb. 17. The much-anticipated unveiling of the Honda aero kit took place Monday evening at a reception attended by principals from Honda Performance Development, American Honda and IndyCar. Defending Indianapolis 500 winner Ryan Hunter-Reay, who drove for a bulk of the on-track development, joined Honda executives in showcasing the base road/street course and short oval aero kit.

Possibly the most accomplished pilot using a Honda engine for 2015 Verizon IndyCar Season, 2014 Indy 500 winner and 2012 IndyCar Champion (using Chevy-power) Ryan Hunter-Reay, had the aerodynamics body work applied to his Andretti Autosport DHL Dallara DW12 for the Honda Performance Development reveal. Image Credit: Jeff Olsen (2015)

Honda Launch Video HERE >>>

Chevrolet and Honda, the current engine suppliers to the Verizon IndyCar Series (America's top professional open wheel chassis motorsports racing series), under the rules laid out for 2015 are able to modify the original body work of the Dallara DW12 to enhance the racing platform as it relates to airflow and give, potentially, an additional advantage to the teams that use their engines. The previous two years that the Dallara DW12 was on the track, all body parts were exactly the same as manufactured by Dallara from the factory for all teams (Honda or Chevy).

The reveal timing all seems a little delayed in relation to generally understood timing used to build fan interest. One wonders how fans, who support the series, are able to analyze and absorb the subtle aero approaches each manufacturer has adopted given that the Firestone Grand Prix of St. Petersburg, will be run in just about 3 weeks, on March 29, which marks the inaugural 2015 competition between the manufacturers' body kits. The speedway aero kit components are scheduled to be delivered to teams by April 1.

Below are full chassis images originally supplied by IndyCar from the manufacturers. The larger hi-res images were cropped in order to bring a visual focus to the three main areas of where aerodynamic body panel manipulation takes place on the Dallara DW12 - the Front Wing, Sidepods, and Rear Wing body parts - for comparison.

First, Chevy supplied the initial image that shows the fluid dynamics effect of their developed approach. The way the lines are drawn, it leads one to believe that the turbulent airflow coming from the back of the chassis has a strong upward motion soon after leaving the rear wing of the chassis.

This fluid dynamics motion is called 'Mushroom Busting' (first coined by Swift Engineering during the Iconic Development Process) which moves the trailing turbulence, that forms in the shape of a mushroom cap, out of the way of the race car behind allowing for stability in racing and possible overtaking.

Frontview Detail Comparison

Chevy Frontview Fluid Dynamics Detail - Image Credit: IndyCar

Honda Frontview Detail - Image Credit: IndyCar

This close-up view comparison has one potentially questioning whether Honda wishes to continue the same 'Mushroom Busting' competitive agenda, explored and - EXPLAINED HERE.

The Chevy front end view seems to have less parts to get in the way of the fluid nature of air whereas the Honda front end has many more elements that appear to be aiding in the dropping of the turbulence mushroom so that it would act as an impediment to any car trailing the Honda-powered chassis.

Front Wing Detail Comparison

Chevy Front Wing Detail - Image Credit: IndyCar

Honda Front Wing Detail - Image Credit: IndyCar

This close-up view comparison has one potentially questioning whither Honda wishes to continue the same 'Mushroom Busting' competitive agenda - EXPLAINED HERE.

The Chevy front end & front wing views both seem to have less parts to get in the way of the fluid nature of air whereas the Honda front end clearly has more elements channeling and funneling the air.

Sidepod Detail Comparison

Chevy Sidepod Detail - Image Credit: IndyCar

Honda Sidepod Detail - Image Credit: IndyCar

The sidepods housed the radiators in the original version of the DW12 so it is assumed the same function of the airflow through the housing performs the same benefit of cooling the engine.

Again, the Chevy sidepod has fewer elements and an addition of an airflow pass through outport just in front of the rear tire. Chevy also supplied a component identification terminology plate which describes the flying wing on top of the sidepod as an 'upper flick' and the element in the middle of the back of the sidepod (main flick) as a 'wheel wedge' which looks a little like a shark fin placed on the pod.

No component identification terminology plate was available from Honda/IndyCar so one is left to guess. The most interesting characteristic seems to be the integral nature of the sidepod without many add-ons or outports carving up the side, visually, and hanging above, leaving an uncluttered profile.

Rear Wing Detail Comparison

Chevy Rear Wing Detail - Image Credit: IndyCar

Honda Rear Wing Detail - Image Credit: IndyCar

For the Chevy rear wing, we almost instantly see louvers on either side of the main central fences or end plates. The louvers allow air flow to move from the central wing section defined by the fences over to the airflow on either side of the central wing.

The Honda aero kit features an added fin along the backbone of the engine cover along with, again, more parts that appear to most observers to aid in the dropping the strength of the upward movement of the turbulent air mushroom cap ... but then, who really knows without the developmental CAD/CAM information and testing statistics. One might say that the Honda aero kit looks less than ... iconic. More parts placed at the corners of the racing platform also equal more Yellow Flag track litter.

As an example that aids understanding in the philosophy that less parts that impede the flow of air is better, the new Nissan GT-R LM NISMO LMP1 employs the use of very large, designed-in airflow ducts where nothing invades the space of the duct.

This excerpted and edited from Racer -

Inside the Nissan GT-R LM NISMO LMP1 program
By Marshall Pruett - Feb. 1, 2015

Designers spend thousands of hours coming up with the best way to make aerodynamic downforce while minimizing drag, and drag comes from interrupting the air.

An LMP1-H punching through the air at 200mph is one giant exercise in disturbance, yet with Bowlby’s through-flow system, he’s found a brilliant method to work peacefully with the air as it envelops the Nissan via huge rectangular airflow channels that start at the rear of the splitter, wrap around the cockpit, and continue to the tail end of the GT-R LM NISMO LMP1. In practical terms, it’s the difference between the hull of an oil tanker making a huge wake and the razor-thin interruption made by an America’s Cup yacht.
[Reference Here]

One thing for sure, only racing on the track will let fan, team, and driver alike really know for sure.

If one hears about difficulty in passing a Team Honda car over the ease at passing a Team Chevy car just know that you heard the first speculation written about >>> HERE!

... notes from The EDJE

IZOD ICONIC Decision For 2012: From Hot Cars ... To Haute Cars

General view of the IZOD IndyCar Series chassis strategy announcement at the Indianapolis Museum of Art on July 14, 2010 in Indianapolis, Indiana. Image Credit: Michael Hickey/Getty Images North America/Clarity Media

IZOD ICONIC Decision For 2012: From Hot Cars ... To Haute Cars

The decision for the future platform and competition in the IRL starting in 2012 was a PUNT. Nothing new here than the Ol' Boys Club sticking together without disturbing the apple cart that has been around 2002 on the manufacturer side.

This excerpted and edited from Pressdog -

Random Reaction Quotes Pushed Out by IndyCar
By :Pressdog.com - July 14, 2010

From IndyCar PR --

WHAT THEY’RE SAYING ABOUT 2012 IZOD INDYCAR SERIES CAR STRATEGY

INDIANAPOLIS (July 14, 2010) – Quotes from selected IZOD IndyCar Series drivers, team owners, manufacturer representatives and other officials about the 2012 car strategy unveiled by the IZOD IndyCar Series (in alphabetical order):

“The ICONIC group has come up with a smart way of bringing diversity and a new look to the 2012 IndyCar while keeping longtime partner Dallara, who has the expertise and an incredible amount of knowledge of the technical specifications of the IZOD IndyCar Series. Obviously as a team owner, I will have a lot of questions regarding this new concept, and I want to be reassured that the new rules around this car will guarantee a good operating cost control and a good open competition in between teams. It is also good to see that the state of Indiana is behind the project.”
-- Eric Bachelart, Owner, Conquest Racing, IZOD IndyCar Series

“Everyone at IZOD is very excited about today’s announcement because the chassis decision encompasses all of the characteristics that attracted us to the IndyCar Series as a title sponsor. The design represents innovation, speed, technology and performance, all of which are attributes of the IZOD brand. The new car, with the extra 100-horsepower push-to-pass capability, will create even greater moments of speed and competition, which is unbelievable. And the fact that they were able to accomplish all of this while keeping the costs contained and the drivers safe is a real tribute to the ICONIC committee and their forward thinking. We think this will bring the sport to whole new level of competition.”
-- Mike Kelly, Executive Vice President, Marketing, Phillips-Van Heusen, parent company of IZOD brand

“This is a great day for all of us in the IZOD IndyCar Series. I couldn't think of a better manufacturer than Dallara to make the Safety Cell, and, of course, make that product in Indiana. Add to that the fact that there will be development around that cell is fantastic. It's what fans and competitors alike have been wanting, and in 2012, we will have exactly that but at a much lower cost than what we are running now. In most aspects of life and business, it costs more to get what you want, but somehow the ICONIC committee has managed to achieve the right product at a substantially lower price. I can't wait for 2012.”
-- Alex Lloyd, Driver, Dale Coyne Racing, IZOD IndyCar Series

“A lighter car is more nimble, makes it easier to pass people. With the turbo engine, you can increase that power to pass a lot, and make for better racing anyway, and more horsepower makes it tougher to drive. There’s more mistakes, more opportunities to pass. You couldn’t have asked for anything better. We have a one-make chassis now, and now we’ll have a common tub, which is safe. And you’re able to design your own bodywork.” (Can you imagine going 240 mph at Indianapolis in a car like that?): “I love competition, I’m not sure that it’s necessary to go 240 again. This year, gee, we were going 228, and it’s getting up there. I think it’s something you have to wait, see and watch it develop and see what horsepower works best where, because with a turbo you can adjust that. The thing I like is it will take its own direction with the design because it’s open.”
-- Will Power, Driver, Team Penske, IZOD IndyCar Series
Reference Here>>

My favorite quote came from Tony Purnell,, a member of the committee that formulated the new rules, as he summed up the decision in a challenge to those various participants: "So come on, Ford. Come on, GM, Lotus, Ferrari. Come on, Lockheed. Come on, Boeing. Come on, you engineers working in small technology businesses. We want you to rise to the challenge." Yea, right ... General Motors is still a government operation, and the others really would not want to put lipstick on someone else's frame (pig). It would be hard for any of them to develop "skin" in the game.

Basically, the IRL is looking to create a fashion show reality series entitled "Dress This Italian Pig" (I thought this was to be an American open-wheel racing series with the development of drivers and technologies originating on this continent). The only competition will be between Target and Penske being able to continue to sell the other teams ... last year's dress.

CTRL-CLICK Image to launch video of mushroom buster explanationImage Credit: Swift Engineering

Swift Engineering, a California corporation known for its work since 1983 in aerospace, aviation, automotive and motorsports engineering and design, had this "Spec" thing thought out right. Create a car that would be true to the concept of Open-Wheel racing ... unlike the Delta Wing/Lawn Dart ... yet work the aero package to reduce the effects of the after-draft air "mushroom" and allow the cars to run safely, and more closely nose-to-tail. This "Mushroom Buster" concept, first introduced to the IRL in Concept #66 with the final version in concept #70, would increase competition on the track and allow drivers to do what we watch them do ... win through skill.

At least this decision to allow anyone to dress up a Dallara chassis matches up to the sensibilities of the title sponsor ... IZOD, a fashion icon brand. This does not, however, increase the driving competition on the track ... the "Mushroom Buster" concept would never be able to be applied consistently. If I were a driver, I'd want the car following my car to be able to be booted off of the track due to the Mushroom Effect when it was following me at 15 miles per hour (if not 14 mph). In this regard I see the decesion by the IRL ICONIC — Innovative, Competitive, Open-Wheel, New, Industry-Relevant, Cost-Effective — Advisory Committee as promoting chaos when a specification series is what they have ... given the fact there is only one chassis manufacturer

One of the major problems with very small, light automobiles is that they can be unsafe in a collision. The Smart solution is the Tridion steel safety shell. Image Credit: ©1998-2006 DaimlerChrysler via How Stuff Works

This decision feels a little like having a "Smart Car" frame dressed ... in a new skin.

... notes from The EDJE