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Gary anderson explained its purpose: "You see a car bouncing, such as when it hits a kerb. This will be at around 8-9Hz on the tyres. This device will get an equal frequency going in the opposite direction. It's a bit like a tall building designed to withstand an earthquake where they put the water tank on the roof - so that when the building sways, the water is going the opposite direction at the same frequency.
In this case, as the car is going up, the tyre is going down and vice versa. With this, the car will still bounce at the same frequency but the amplitude will be damped down. If you take an average tyre contact load and assume say 1000kg, you'd typically see a variation of 900-1100kg. But the driver needs to feel sure of what he's got as he goes into the corner. Is that 900 or 1100? With a weight of around 10kg you can maybe get the variation down to 950-1050kg, so he's got a more constant load. It's a very good idea. It would also be easy to set-up on a seven-post rig, balancing mass against damping. I reckon it would take no more than 15 minutes to set it up. On the downside it adds a bit of weight quite high up in the car.