War technologies: Rockets

I know you missed my redstone creations, so here is my big return after the final exams that made me cancel the older projects.
For years the most powerful weapon in Minecraft was TNT cannons, but now I came up with the next most powerful weapon which is safer to use, way easier to aim and has no range limit. It's time to introduce the first ROCKET in Minecraft!
Also, a whole bunch of random flying technologies will be uploaded later too, so you have a lot of awesomeness to wait for!

Instructions:
Activate first the bigger machine by clicking the wooden button on it, then activate the smaller one.

If you wanna build it yourself, note that you'll have to use obsidian or container blocks (such as furnace) to make sure the pistons will not move while you build the rocket.


Note: This rocket uses the smaller but slower engine, if you attack someone you'll prefer to give him less time to notice that a wierd machine with a lot of TNT is flying towards his base so you better use the faster engine I uploaded. It is very easy to change the engine, but don't worry if you can't do it - I'll upload soon a better rocket that is already with the faster engine.