BONTAZ R&D engineers, HBK solutions and the French bobsleigh teams share a single goal: The 2022 Winter Olympics!

• The development of a push car 2.0, which measures and analyses the athletes to help them improve performance.
• Around 10 engineers from the Bontaz R&D department working part-time on the project
• Support from the Auvergne-Rhône-Alpes and cross-border partners, including Hottinger Bruel & Kjaer and Astrym
• The production of a web series #EnglisseversPekin20222 (available on YouTube in French and English) making it possible to follow the preparation for Beijing 2022 on video.
• Numerous employees being involved on an ad hoc within various Group entities

HBK had already worked with the FFS (French Ski Federation) on the start gate handles to find the best technique to propel oneself ahead of everyone else at the beginning of the race, thus increasing the chances of success at the finish. With the bobsleigh, the logic is the same because the push corresponds to 1/3 of the final performance (tin addition to the piloting and the bobsleigh) and the complexity wich has to be addresses is that it is necessary to coordinate 4 pushers simultaneously with successive boarding phases. Moreover, there are 3 different types of handles and each one has its specificity: the pilot handle which allows to follow the flexion created by the lever arm, the side handles where we play on the torsion of the axis attached to the hull and finally the 2 back handles where we come to observe a compression of the material. Strain gauges are ideal for all these measurements. The installation of the gauges was easy because all the handle systems were designed to be removable and therefore easily deliverable, unlike the bobsleigh wich measures around 3m80. Once the gauges were in position on the bobsleigh, calibration using a dynamometer was carried out in the BONTAZ premises, with the support of Astrym as all the measurements were recorded by the data acquisition system developed by this company. This operation is one of the most important if reliable and exploitable results are to be obtained. Using the Catman software, the French Teams could graphically represent the efforts experienced by each handle and correlate them with a video in order to improve the athletes' technique.

In addition to the bobsleigh instrumentation, BONTAZ supplied "wheel" kits for use during summer training on La Plagne athletics track; the equipment was matched as close as possible to those used in actual competition. For example, the handles are the same as the ones on the bobsled that does the World Cup runs, as well as the height in relation to the track, so that they can easily transpose the technique between the different seasons. Previously they used a weighted cart which they could not sit in and had handles in the form of simple tubes. Now all four athletes can board, so each of the push steps can be worked on and improved. During the preparation courses, the bobsledders made several descents recorded via the central acquisition system and filmed while modifying the pushing techniques (horizontal or with an angle, hands clenched or spread out). In the evening, the whole thing was analysed by the staff to see what worked and what didn’t, in order to avoid slowing down the bobsleigh during this phase of the race.

The bobsledders had to rethink their training methods due to the new equipment and become rigorous in retrieving and exploiting the results, as they did not previously have access to that much data on their individual and collective performances. This allowed us to determine the typical crew and in which positions people perform best. From a chronometric point of view, we are talking about a gain of several 0.01 seconds or even 0.1 seconds on thrust alone; this will also have an influence on the maximum speed during the race, so there are still 0.1 seconds to be gained.

It is true this kind of adventure is not common in our daily work. Usually we trial the parts we develop ourselves because we have an in-house test laboratory, but in this particular case, the best judge of is the track, the rider's sensations, the times and we can go from one extreme to the other very quickly in the event of injury or lack of confidence on the part of one of the EDF members. They are men and women who train hard all year round for one minute of racing at more than 130 km/h, we worked hand in hand behind the scenes with a lot of sweat and sacrifice. Despite this pressure, the exchanges were always very friendly, constructive and focused on the common goal of a medal at the Olympic Games. Suggestions for improvements came naturally, discussed by SMS or video directly with the pilot, Romain Heinrich, who has been the leader of this EDF Bobsleigh team for several years. The feedback from various tests was very comprehensive in order to validate the direction we were taking and see the study to the end. During all these years, BONTAZ was able to provide them with the necessary means to have access to things they had never known before, due to financial restrictions. I still remember the wind tunnel tests in Geneva for this F1 on ice where you could see the excitement on their faces and all the video clips that made it possible to get a close-up view of this great sport, which usually receives little media coverage.