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This paper show some examples of our C springs manufacturing, realization, testing and optimization features. Composite C Springs have been developed by our company Since 1993. We will start our presentation by an analysis of reasons why Composite Compression Springs (patented) perform well compared to leaf springs. Then we will give examples of some development programs we have successfully carried out from study up to vehicle road testing. The C Springs have been tested in static measuring bench, in fatigue and in relaxation machine. C Springs have (and are), also road tested. More than hundred of thousand kilometers have been achieved with success (near exhaust pipe). We will present examples of spring integration giving a dramatic weigh reduction, as well than ride handing improvement. We will also introduce cost notions showings that Composite Compression Springs save money as well as weight on a vehicle.

Our organization has developed since 1992 a numerical model in order to compute fan performances. As we have observed lack of noise efficient prediction tool, we have aimed to an integrated model, which enable us to fully optimize fans, pressure and noise wise. This paper show some examples of our model optimization features. Our numerical model compute noise versus mass flow as well than pressure versus mass flow. This model is valid as well for axial than for centrifugal for mix flow fans and fans for auto cooled traction motors (clock wise and anti-clock wise rotation). Thank to our model and our expertise, we have developed ultra low noise fans for a lot of applications. Some of them are described in the paper. An important point is that the fans we develop are interesting for energy efficiency; and so, money savings are possible as well in energy consumption than in drive installed power requirement.