I am also not an engineer, but taking a look at the 'aero' claims by LG (Course Helmet) and Carrera (Radius/Razor) it seems that these two offerings are attempting to maintain ventilation while allowing for some aero qualities of the helmet overall
I know enough of aerodynamics to understand there is more than making it look like a tear drop
But that said I think the Carrera looks completely generic... not different than the average Giro. I'm sure I'm missing something, but the problem is that only a few salesmen put it up as aero, Carrera themselves seem rather sparse with info.
RADIUS, Revolutionises the Pro helmet. Developed using the innovate "ATF" (Aluminium Tech Frame) system, Radius offers the best aerodynamic penetration (CX) which is synonymous of optimised internal ventilation and less frontal air resistance.*
Nice words, but best compared to what? Best of every road helmet? Best Carrera?
Not saying other manufacturers don't do the same thing, but with LG and Giro I can see the differences, this helmet looks amazingly generic. But hey, if it works I'll be in line buying one as it sure looks less silly (I need that as I am just pack fodder).