An other great advantage of the latest Windform® family material, XT in particular, is described here below: currently used in windtunnel, component made from RP technology in Windform® XT has been directly characterized by comparison with similar component made from carbon fibre.

In this following case, component made was a large part of the car defined as a fender fitted on a wind tunnel model of Dodge Charger currently racing in the Nextel Cup.

Due to his position, the fender is defined as sensitive part with important effect on the drag (Cx), lift (Cz)and balance of the car.

During windtunnel run, as usually a map of various ride height with each of these component, the carbon fibre one then the Windform® XT one, and standard aero parameters have been measured on the model, drag, lift (= downforce) and balance allowing full post session analyse for others aero parameter like efficiency. For more indication, baseline was made with carbon fibre fender, and aero map was defined over 7 reference ride heights.

Based on the average values, data show result that was clearly within the repeatability range affecting each windtunnel. For obvious confidentiality reason, direct WT datas could not be disclosed but percent error between the two component resulted as follow:

All these are error respect to overall value of the model ( i.e. error of 0.2% between the two parts on the measured downforce respect to the total downforce of the car).
Again this result was clearly within the range defined by windtunnel and aerodynamic teams for the typical repeatability (back to back run or placement of part on the model) or overnight repeatability, and confirm stability as well as practical advantage of the WINFORM XT material over carbon fibre.