>They could turn it in to a commercial engine, mount it on some aircraft, and completely dominate the air travel and air freight.
It's entirely possible that some novel propulsion technology would only work with extremely light craft under specific conditions, and either couldn't scale to the size of a commercial aircraft, or would be less efficient or cost effective at that scale than existing technology.
Ion propulsion is only useful in space, for instance.
It's entirely possible that some novel propulsion technology would only work with extremely light craft under specific conditions, and either couldn't scale to the size of a commercial aircraft, or would be less efficient or cost effective at that scale than existing technology.
Ion propulsion is only useful in space, for instance.