XTI’s TriFan 600 recently flew as a TriFan 665, for the 65-percent test concept vehicle. There are good reasons for a first flight on this reduced scale, including being able to use smaller motors and batteries, less material, and possibly simplified systems. On May 8, 2019, XTI Aircraft announced that they had successfully completed the first test flights of its 65% scale prototype of the TriFan 600 VTOL aircraft: The 2/3 concept machine, built on the local Experimental Aircraft Association’s turf, elicits some wonder because none of the chapter’s recent newsletters or Facebook posts mentioned that this project was underway. Having worked in a design/build architectural-engineering firm, your editor knows all too well what the phrase “confidential client” means. Chapter 512, knowing the TriFan was on the field, held that confidentiality well. Only XTI itself made any public pronouncements about the project. According to Transport UP, “During testing early this month, the 65% scale prototype of the TriFan 600 completed multiple takeoffs, hover, …