Seems like the most likely option is that they're.
On the topic of plane propulsion, I ran into this video on a new design for engines: https://youtu.be/ojVNOj-q3SQ
Oh yea, that's good stuff, thanks for the link
On the topic of plane propulsion, I ran into this video on a new design for engines: https://youtu.be/ojVNOj-q3SQ
Oh yea, that's good stuff, thanks for the link