Great concept

It's really a cool idea and as for the lineart it is pretty well executed. It would be even better if you added some shading or optimally even color.

Nevertheless, it's a good piece of art with an interesting composition.

I like how you managed to give the bottle a glassy look just using some thin pencil strokes especially on the neck, it comes across very well.

It would have been a much stronger piece if the background was not just plain white. I think some indicated stars or distant clouds would have done the trick.

The lines should have been a bit more cleaned up. There is for example a guideline from the bottle's top to the bottom and one crossing from the left wing to the right wing still rather prominent.

I like how you did the flames, especially the dented part where they emerge.

Overall it's a great idea with great lineart, but I would love to see this brushed up and completely finished someday. Or, since you probably want to keep this one the way it is, a new colored and shaded drawing based on the same concept.

good idea

I like the idea of this, but it would have been cool if you had incorporated more beer related elements. The thrusters could be beer kegs spraying beer out of the back, maybe you could have incorporated a bottle opener too.
The way you outlined the thruster flames makes them look solid; I'd personally have made it a couple of lines rather than a closed shape so that it's more obvious that it's not a solid.
In such an industrial design; it's important that symetric stuff is actually symetric, which you didn't quite manage in certain areas of this drawing.
I always like your pencildrawn stuff much better than your digital inks; maybe you could try doing some pencil shading too.

We have the technology!...we can make it...

This concept of an flying beer would be a break through for all beers. I like how it even looks symmetrical!