📍 Motegi Turn 11 Downhill Braking
Mobility Resort Motegi is the ultimate "stop-and-go" layout in the world championship. Coming off the back straight downhill bridge, MotoGP prototypes decelerate from 315 km/h to under 75 km/h in approximately 240 meters, experiencing over 1.8G of longitudinal decel and extreme rear-wheel lift.
⚔️ Marc's "V-Cut" vs Marco's Sweeping Arc
Marc Márquez's trademark technique relies on brutally late trail braking right to the steering lock, squaring the corner off into a V-profile to get the bike upright instantly for drive. Marco Bezzecchi utilizes a higher corner-entry rolling speed, carrying 3 to 5 km/h more mid-corner apex velocity with smoother lean transition.
🔬 Kamm Circle & Weight Transfer Dynamics
Tire grip is governed by Kamm’s friction circle: $F_{total}^2 = F_{brake}^2 + F_{cornering}^2 \le (\mu \cdot F_z)^2$. Under 1.8G braking, 95% of the total 157kg prototype plus 65kg rider weight transfers onto the front 120/70-R17 Michelin slick, creating tail waggle and requiring precision trail-brake release as lean increases.
Physics Assumptions & Telemetry Channel Documentation
Speed (km/h): Integrated longitudinally from entry speed, aerodynamic drag ($F_{drag} = 0.5 \rho C_d A v^2$), engine braking, and front Brembo 340mm carbon disc brake pressure.
Front Brake Pressure (Bar): Measured up to 16.5 bar at the master cylinder. Full initial bite tapers down as the bike tips past 35° lean angle to stay within the tire contact patch adhesion envelope.
Lean Angle (Degrees): 0° vertical up to 66.5° maximum MotoGP elbow-down lean angle. Measured via 6-axis IMU gyro sensors.
Rear Wheel Contact / Pitch: When front deceleration $a_x > (b / h) \cdot g$ (where wheelbase $L \approx 1450\text{mm}$, CG height $h \approx 620\text{mm}$), the rear tire unloads completely into a controlled stoppie / slide.