I've done glider pilot training and gliders are an aberration as they are built to be supremely aerodynamical. Yet, once you go high speed (>100km/h), they are

I've done glider pilot training and gliders are an aberration as they are built to be supremely aerodynamical. Yet, once you go high speed (>100km/h), they are noticeable and at 140km/h they sound like an approaching storm, so you definitely won't miss them nearby.