Maybe three weeks ago I played around in my CAD program to check for a possible rear diffuser. After several approaches I decided for a design that uses the maximum of available area and that would not lead to a stall of the flowing air by having a steep angle.
In between my work I let the old 3d printer build the now following prototype. It came out quite good and is stronger than I would have expected. I will now use it for a pre race test on saturday. My aim is to renounce the normal rear wing on larger fast outdoor tracks... This aspiration is maybe utopian, but I will try. Well I am not really overmotivated, but will give undertray downforce a last chance.