Methinks this is very much work in progress. If they want to attract serious (industrial) users, which from the looks of their Terms & Conditions they do - read the rules about citing W|A! - they have a long way to go. Searches for anything vaguely technical are generally not successful; I've tried Navier-Stokes, laminar layer momentum, skin friction coefficient, and several others to no avail!
Still, I reckon it'll take a while to get off the ground and get a decent database amassed. If it works it'll be superb!