Discs with holes help heat dispertion in the best possible way
31 October 2017
IF YOU LOWER YOUR HEAD ON THE STRAIGHTS YOU WILL GO FASTER!
Engineer, journalist, great kart enthusiast and ... TKART collaborator
“Aerodynamic effects are strongly influenced by the shape of the object invested by airflow. Over the years, simulations have also been made to understand the effects of the driver's position on a kart. Comparing a kart simulation with a driver who is standing erect, one with a driver hunched behind the steering wheel, and one without a driver on the kart, it was noticed that the effect of the driver's lowering was significant in terms of resistance, while the unreal hypothesis of an unmanned kart was the worst situation, even compared to a driver standing erect. Analyzing the flow lines it has been noticed that when the driver is crouched, less vein fluid detachment is generated (i.e. airflows are glued to a body – editor’s note), while the situation is the opposite without the driver. It should also be noted that the configuration with the driver has two distinct beneficial effects: the first is a Cx reduction, the second is a frontal area reduction. This means that the benefit in resistance terms is twofold: the resistive force is linearly proportional to both the Cx and the frontal area. In fact, in the absence of a driver, the frontal reduction is compensated by a worse Cx, which therefore gives the lowest resistance overall”.
DISCS WITH HOLES HELP HEAT DISPERTION IN THE BEST POSSIBLE WAY
Intrepid Driver Program. A man of great experience in the manufacturing of karting chassis and accessories.
“In my opinion, holes do not help ventilation inside discs, but actually make it worse, because they change the airflows created by the fan inside the disc. Holes give an advantage in terms of weight and help keep the brake pads revitalized by eliminating the coating that often forms on them; this the real reason they are useful. They basically improve the effectiveness of the braking system”.
SYNTHETIC OILS LOSE THEIR PROPERTIES AT HIGH ROTATION SPEEDS
A Dutch engineer and motorcycle champion who was general manager of Maxter, the motorbike division of CRG, a few years ago
"The truth of this statement depends on the type of oil used for the mixture, because even oils should be used according to the objectives you wish to achieve. Years ago lubricants were only mineral based. Synthetic oils are produced in the present day, but the quality of the finished product depends solely on the quality of the components. If you wish to produce a 100% synthetic high quality oil, you would risk having to sell it for 100 Euros per litre ... so nobody would buy it. Thanks to technological improvement, synthetic oils use components that are of a higher quality than mineral/vegetable oils and I think that, in the long run, especially when it is necessary to decrease the percentage of oil in the mixture, only synthetic oils will be used, for quite some time probably with some mineral/vegetable components".
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