MotoGP - Sachsenring 2017
date
29 June 2017

category
Racing world
MotoGP - Sachsenring 2017

 

Now Rossi is 3rd in the world standing, with 108 points, behind the leader Dovizioso with 115 points and Viñales (Movistar Yamaha MotoGP team sponsored by BMC) with 111 points, 4th is Marquez (104 points).

MotoGP – Next race

The Germany GP will be hot for the challenge and for the brakes at Sachsenring. Marquez will try to reach the sixth consecutive victory in Germany, but Dovizioso, Viñales and Rossi (both Movistar Yamaha MotoGP team sponsored by BMC) will surely fight back to keep the top in the world standing.

The Sachsenring is a winding racetrack, so in the short gaps between one bend and the next the brake system has no time cool off and the warmth makes it even worse: in 2015 the asphalt reached 42 °C during the race. Sachsenring is the only MotoGP circuit that is less than 4 km long. And yet, it has 13 bends, 10 of which are left turns, and very short straightaways: the longest, before the finish line, is just over 700 meters.

The demand on the brakes during the GP

Throughout the lap, MotoGP riders use their brakes 7 times for a total of

210 braking sessions in the whole race. The 19 seconds per lap during which the brakes are used are a negative record for the championship, being even less than the 20 seconds needed at Phillip Island, which only has 6 bends.

Unlike the Australian track with only one deceleration above 1 g, Sachsenring stands out for at least 4 braking sessions of at least 1.4 g.

But the three other braking sessions, at 0.6 g and 0.7 g significantly lower the average, bringing it down to 1.10 g.

The total of all the forces the rider applies to the Brembo brake lever from start to finish line is in excess of 900 kg.

The most demanding braking sections

On the 7 braking sections at the Sachsenring, only one is classified as demanding on the brakes, 3 are of medium difficulty and the remaining 3 are light.

The first bend is the most demanding both on the riders and on the brakes:

the bikes come up to the bend at 291 km/h and take the bend at 74 km/h after braking for 244 meters. The riders hold onto the brakes for 5.2 seconds and are subject to a deceleration force of 1.5 g. The pressure of the HTC 64T Brembo brake fluid is brought up to 10.6 bar, over 5 times the ideal pressure for a beer dispenser.

The load on the lever (6.1 kg) is identical to the load needed for curve 13, right before the finish line. Brake fluid pressure is also identical, despite the fact that the braking session lasts 3 seconds as the MotoGP bikes travel 129 meters. On the other hand, the bikes come up to the bend at a slower speed (219 km/h) and stop braking at a higher speed (95 km/h).

The brakes are used for less than 60 meters each for curves 2 and 3: 56 meters for curve 2 and 58 meters for curve 3, with less than a 3 kg load on the lever in both cases.