Air Force Flight Test Museum taking in more NASA history with Phantom Eye, LLRV > Edwards Air Force Base > News
Why did the Boeing Phantom Eye aircraft use liquid hydrogen for its piston engine instead of kerosene or jet fuel with higher energy content? - Quora
![Boeing Phantom Eye sub-scale tech demonstrator UAV powered by two Ford Fusion engines modified to run on liquid hydrogen. (2012) : r/WeirdWings Boeing Phantom Eye sub-scale tech demonstrator UAV powered by two Ford Fusion engines modified to run on liquid hydrogen. (2012) : r/WeirdWings](https://preview.redd.it/jbg7f8u2si661.jpg?width=640&crop=smart&auto=webp&s=02b119b73a0711df74dcdd8dbef6cc9d74eff100)