Willelm said:
Ok, I know, I must write papers. But the question now is about what write. In other discussions, some people, like Dr.Courtney, told me that I shouldn't be focused in an specific area, so what must I do? I like Applied Physics, Mathematical computing and Aerospace Engineering. I'm specially good at logic. What should I do?
Most like minded high school students think of a good science or engineering project that is within their abilities, and they design and execute a project to compete in a local science fair. Most find the experience very encouraging and the feedback valuable and rewarding. Competitions like JSHS also require you to write up your research in a paper, which can be valuable experience, but only a small number of these papers are really publication quality.
Finding a mentor and aiming for these kinds of events is the next logical step. You may want to put together a resume or something to give to professionals as you are looking for a mentor.
Just like Homer Hickam of Rocket Boys fame, we've had a few students do solid work with rocket engines. There are some good ideas that can be tested with little more than a force plate of humble size and some hobby-sized rocket motors. Here are some of our papers:
www.dtic.mil/cgi-bin/GetTRDoc?AD=ADA571357
http://arxiv.org/ftp/arxiv/papers/0903/0903.1555.pdf
http://www.libertylaunchsystems.com/RocketsMagazine/Issue0031/Sample.pdf
(See page 50 ff).
There is tremendous potential to learn and do well in science fairs with rocketry projects: sugar based fuels, bio fuels, testing whether manufacturers meet impulse and force specifications, improved nozzle designs, reduced weight pressure vessels, reduced cost motors, etc. We've made reduced cost motors from everything from aluminum flashlight cases (reusable) to brass from rifle cartridges (single use).
Mentoring these projects is also within the abilities of many high school physics and chemistry teachers, most mechanical engineers, and many rocketry hobbyists.
Once you get some basics down with a simple solid fuel project or two, you may be ready to tackle some ideas in hybrid rocket design.