## WHAT IF? XKCD Answering the question on all our minds:

“Is it possible to build a jetpack using downward firing machine guns?”

-Rob B

Hit up “What If?”over at XKCD for all the math and some other interesting info as well such as:

The GAU-8 Avenger fires up to sixty one-pound bullets a second. It produces almost five tons of recoil force,which is crazy considering that it’s mounted in a type of plane (the A-10 “Warthog”) whose two engines produce only four tons of thrust each.If you put two of them in one aircraft, and fired both guns forward while opening up the throttle, the guns would win and you’d accelerate backward.

hahaha wow. **Thoughts?**

Also, if you have any interest in math, science, or engineering make sure you’re following the XKCD comic.

Hat tip: Stephan, Eric