Construction of Rear Axle & Braking Systems
Having developed and built our Calm Aluminium wheels which are capable of 1000 mph, we have turned our attention to having a wheel braking system that will complete the job of stopping a vehicle weighing in at 6.4 tonnes (dry).
Initially slowing the car from high speeds will employ a series of systems and methods from wind resistance, air-brakes and parachutes. Low speed braking will utilise the rear wheels only as we do not want to use front wheel braking, as the front wheels are forward of our Liquid Oxygen tanks and sparks and possible sloshing issues are definitely things we want to avoid. Braking from the back should not compromise steering, help to straighten the car up and avoid possible yaw issues.
Our good mates at the North American Eagle Team have developed an electro-magnetic braking system that uses their aluminium wheels as the rotor/conductor to generate friction when a large circular coil is pushed close to the rotating wheel via hydraulic brake pressure. The beauty of this system is that there is no brake rotor that has to rotate at over 10,000 rpm. We looked at developing something similar based on the North American Eagle idea but after careful consideration of the amount of work involved, we decided that a forged steel rotor should be able to rotate at 10,000 rpm with a moderate safety margin.
We have 375 mm brake rotors which are undergoing Finite Element Analysis (FEA) as we speak, with an 11,000 rpm spin test to follow. We are using 6 spot callipers with a special ceramic embedded brake pad. It is anticipated that our conventional brakes will only be applied at a speed of around 200 mph (320 km/h) to bring the car to a halt.
Big thank you to Les, Ken and Mal Austin from Kentin Engineering.