so it would be routine in this routine is. how would improving aerodynamics help the equation that s what professor court also and his team are investigating at the german aerospace center and brown spike today they re testing a special prototype and the center s wind tunnel they hope the low noise aircraft will be quieter than conventional planes and you suppose they ll have to change the entire plane in the essence that s what happened here because there s this separation effect that happens when you place the turbines up and back that doesn t get rid of the sound but it generates it in a different direction doesn t spread downwards where it bothers people instead it s generated upwards into the atmosphere and that s the only way to make it work as a systems force or. ok let s get started. the experimental design is in place the door closes the rotor is switched on in the