But seriously, the explosion risk from hydrogen fuel cells, gas engines, or lithium batteries is about the same across the board when you discount human factors
If I were to build something from the ground up and wanted to forge my own way instead of, say, a kit helicopter, I'd likely do a gas engine tri-copter. Something with enough shaft horsepower to spin some larger and more efficient blades.
Something just dawned on me. You know how we went from two digit years to four digit years because of the Y2K bug? In like 9K years we'll have to go to 5 digit years to combat the problem again