The person looking like this was, naturally, Chen Ping, who had spent several days straight holed up in the laboratory.
Only now did he understand just how great the gap was between proving a piece of equipment theoretically feasible and putting it to practical use.
Because Soul Power utilization and thrust rose sharply within the subsonic range, the overall layout of the Flying Soul Tool Chen Ping had upgraded to a turbofan engine structure had undergone major changes.
It was only thanks to the system's simulated wind tunnel blowing air through it while Chen Ping modified the starting aerodynamic structure that he had quickly corrected the flaws in its design.
After that, he had spent several more days working without sleep or rest to produce the finished item.
As for how other people on the Douluo Continent, who had neither wind tunnels nor simulated wind tunnels, determined whether a Flying Soul Tool's structure was sound?
They could have Wind Attribute Soul Masters blow fiercely at the Flying Soul Tool, serving as human wind tunnels, or use flight-capable Soul Masters as flesh-and-blood test pilots.
From a certain perspective, this testing method really was a new technology that Blue Star could only trail far behind.
"Oh, crap. Why are there so many people in the Soul Tool Department today?"
Only after stepping out through the Soul Tool Department's gates did Chen Ping belatedly realize something.
What the hell was today's date?
As everyone knew, there were no new students in the Soul Tool Department during the holidays, and in the days before the Upgrade Assessment, everyone was busy preparing for the Upgrade Assessment, so there would be no returning students in the Soul Tool Department either.
Which meant that, with both new and returning students in the Soul Tool Department right now...