Racecar Engineering

Racecar Engineering

August 2021

Racecar Engineering is the world’s leading technology publication for the motorsport industry. From aerodynamics to engines and from handling theory to manufacturing practice, Racecar Engineering is read by motorsport’s top professionals. Only Racecar Engineering brings this insight every month.

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12 Números

en este número

1 min.
why remote shock reservoirs?

Q Why do people use remote reservoirs on shocks, when they could have the gas piston and the gas in the shock and save a bunch of cost and complexity? THE CONSULTANT A The biggest reason is to get more travel from a given length shock. If the gas reservoir is in the shock body, it takes up some of the length that could be used to add travel. When the reservoir is remote, it can be bigger, reducing the gas spring rate. However, gas spring rates are generally small, even with integral reservoirs. Additionally, in some cases an extra valve is incorporated in the reservoir, which mainly softens high-velocity compression damping. There is some possibility of interconnecting shocks using the same plumbing, but this is limited by the fact that only shaft displaced volume…

1 min.
dakar part of fia world championship

The Dakar Rally, one of the most famous in the world, has fallen under the auspice of the FIA, which granted World Championship status to cross country rallying. Following an e-vote by FIA World Motorsport Council members in June, the World Championship will be launched in 2022 with an agreement with Amaury Sport Organisation, who will become the exclusive promoter of the championship for a five-year term. The FIA is also developing technical regulations for new, alternative and experimental technologies within the already gruelling discipline. This, it is hoped, will prove to be the ultimate challenge for the application of science as the Championship will visit some of the most remote and harsh environments on the globe. The 2022 calendar will kick off with the Dakar Rally, and the full line up of…

1 min.
tunnel vision

3D Systems has produced a new material specifically designed to address PIV testing applications used in motorsport wind tunnel testing. The material is called Accura Composite PIV and has been designed in collaboration with the Alpine F1 team to improve the accuracy of reading 3D printed parts in the wind tunnel. The company’s SLA technology has allowed F1 companies to build rigid aerodynamic parts with high productivity and leverage innovations such as integrated pressure tappings. These parts are used in testing that relies on a laser-based technology known as ‘particle image velocimetry’, or PIV. One challenge with taking reliable PIV measurements is the reflections of laser light from background surfaces other than the airborne particles. This reduces image quality and results in a loss of useful information. Accura Composite PIV is a reflection-mitigating…

11 min.
target practice

Le Mans Hypercar (LMH) class is here, after a long and complicated gestation that saw the rules change several times before settling on a plan manufacturers could use to construct their cars. Racecar Engineering understands there could still be changes in some areas, as uncertainty, mainly related to new car performance, such as that of the Glickenhaus 007C, remains. One of the consequences of the performance targets set for this new class is that the performance of the LMP2 cars had to be aggressively reduced in order to achieve the necessary differentiation between itself and the LMH class. That has proven chaotic, and has seen LMP2 holding different technical rules in every championship in which it competes worldwide. The ACO gave the LMH class a target race pace in Le Mans of…

8 min.
the no way transfer part 1

Let it be clear, the suspended mass does not rotate around the kinematic roll centre (in 2D), or around the roll axis (in 3D). You cannot calculate the lateral and longitudinal load transfers without considering the tyre forces and moments, or by ignoring the jacking forces. Many right and wrong things have been written about load transfer over the years. In this article, we will cover how load transfer is explained in many vehicle dynamics books and articles, and explain what is sometimes wrong, or incomplete, with these concepts. First, a quick reminder. As explained in a previous article, I prefer to speak about load transfer instead of weight transfer. Some people still wrongly believe that the main cause of the change of vertical load between inside and outside tyres comes from…

13 min.
max attack

A big design criterion was we really didn’t want any turbo lag on this thing because there are so many first gear hairpin exits Bentley may have cancelled its factory GT3 programme, but the Continental continues to race in private hands and is still available for sale. However, the factory turned its attention to an entirely new challenge for its latest version, a Time Attack on the Pikes Peak hillclimb using a fuel that produces up to 85 per cent less greenhouse gas than regular fuel. The base car is run by Luke Clayton, a long-time Bentley customer, but the factory used his hillclimb experience, and car, to create its GT3 Pikes Peak. Using experienced team, Roger Clarke, and engine partner M Sport, Bentley pulled together some incredible expertise in order to…