[lyner]

It's the concentration that makes it explosive. Every molecule of ethanol has  handy Oxygen molecules to react with. If it's all alcohol, there's no Oxygen there for it to react with.
Listen (i.e. read) - why do you think amateurs don't use liquid fuel?
It's because that's big boys' stuff. You will just give yourself a nasty burn and achieve nothing if you try to do your own thing.
Do yourself a favour and buy a rocket kit on line and get it out of your system. How old are you? A student?

[Naufal the B. S. (OP)]

Ok ok
my secrets detected by your genius brain.
I'm 13 years old and i very very like science.

So... Every alcohol is ethanol?

[lyner]

Have you heard of wikipedia?
One page of wiki is worth a lot of questions on this site - if you have specific information that you want. Look up Alcohols.
But it may not be as much fun.
DON'T (try to) BUILD A ROCKET BTW.

[Naufal the B. S. (OP)]

Ok, thanks a lot, genius scientist. I hope, i'll be like you.
The outer space scientist!

[Naufal the B. S. (OP)]

So... The scientists in this forum copy the answers from wiki?
(including you)

[Chemistry4me]

No, the 'master' does not, but I do. []

[lyner]

So... The scientists in this forum copy the answers from wiki?
(including you)

That's cheeky!
I seldom use wiki as an only source bur, for instant and well known data, it's hard to beat.
If I referred you to a book, you wouldn't have it! []

[Naufal the B. S. (OP)]

Btw...
What's the function of sugar in amateur rocket, sir!?

[lyner]

I'm not telling you any more dangerous information, young man.
Let's stick to theory! You won't damage yourself that way.

[Naufal the B. S. (OP)]

Did you mean...
I cannot make ONE rocket. I was wondering when i saw liftoff of rocket in tv, computer, etc. Because of it, i want to make my own rocket and see it liftoff. If it happens, i feel very very happy.

[Chemistry4me]

You can try a water rocket! That's very easy to make, and you won't kill yourself.

http://www.thenakedscientists.com/HTML/content/kitchenscience/exp/water-rockets/

[Naufal the B. S. (OP)]

I don't like water rocket. Maybe, i'll go to chemistry shop and buy some kno3.