Not hard at all. Here are few key points to remember:<p><pre><code> - parachutes go at the top, engines goes at the bottom
- engines point down
- don't mess up your staging
- if you didn't go high enough, put more boosters
- if you fell apart in flight, put more struts
</code></pre>
Sincerely, Jebediah Kerman.
This guy is very entertaining in the video, and what they're doing is very practical.<p>Rocket engines sometimes get described as extreme plumbing. Big rockets that are more powerful than the simple solid rockets the video describes tend to use cryogenics like liquid oxygen (-185C/-300F) in one part of the rocket, and then at the other extreme have a combustion chamber over 1500C/2750F that will melt most metals.<p>Rocket science <i>is</i> hard.<p>For some more good reading, there's a great usenet archive of sci.space at <a href="http://yarchive.net/space/index.html" rel="nofollow">http://yarchive.net/space/index.html</a>