During tests on the SXM-02 the king was in attendance. however, instead of focusing firmly on the test as he had during previous visits, he was scribbling on a piece of paper for the whole second half of the demonstration. Just before the end of the test he ordered all of the designers to follow him to the workshop, where he revealed what he'd been writing: on the paper was a rudimentary design to integrate the engine of the aircraft into a line of fans, the fans in the front would compress air for the engine's intake, and the engine's exhaust would push it's fumes through more fans. the designes were refined into what resembled a half-jet engine, and two of these were added to a modified SXM-02, designated 03. the aircarft showed great promise and was immediately sent for advanced testing. for more on the history of this aircraft look at my forum post, and at the other "Vanguard industries" planes I've posted :)