48
votes
What is the feasibility of a rocket hobbyist achieving a LEO orbit with a microsat?
It isn't really feasible to launch your own rocket, unless you have a lot of money to spend. The required power is immense. Hitting sub-orbital might be possible, and has been done once by amateurs, ...
- 122k
45
votes
Accepted
What would one need to do to get an amateur satellite into orbit?
Astronautical engineer here, welcome to the small satellite community!
Firstly, it's important to recognize that the FCC tightly regulates the radio spectra available to satellites and amateur ...
- 897
20
votes
How easy is it to use liquid nitrogen dioxide as an oxidizer?
Not a good idea for amateurs; it can kill you without you realizing you're dying:
10–20 ppm can cause mild irritation of the nose and throat, 25–50 ppm can cause edema leading to bronchitis or ...
- 172k
17
votes
Accepted
Can we use liquid propellants in amateur rockets?
Liquid propellants like kerosene and hydrogen peroxide - that's risky, though doable.
Cryofuels like liquid oxygen and hydrogen - no. Even if you manage to develop an amateur rocket motor that's ...
- 56k
13
votes
What would one need to do to get an amateur satellite into orbit?
The Space Shuttle retired in 2011, and no amateur launch has ever reached orbit, but there are plenty of opportunities to piggyback on commercial and government launch services. Mostly this is ...
- 1,705
13
votes
Accepted
Could HIBEX propellant be used for amateur rockets?
According to Wikipedia,
HIBEX employed a star-grain "composite modified double-base propellant", known as FDN-80, created from the mixing of ammonium perchlorate, aluminum, and double-base ...
- 172k
12
votes
What would one need to do to get an amateur satellite into orbit?
A TV show addressed this some years ago. What appears to be the full video on You-tube:
(Link gone--tv show "How Hard Can It Be", Episode 3 -- "Homemade Rocket".)
Owner's website ...
- 11.7k
12
votes
How easy is it to use liquid nitrogen dioxide as an oxidizer?
Nitrogen dioxide is a chemical that forms an equilibrium with dinitrogen tetroxide, which in the world of rocketry is often just called "nitrogen tetroxide" so as to increase the amount of ...
- 9,517
10
votes
Accepted
Can I make my own RP1?
I'm going to start off with a warning: if you want to get started with model rocketry, it is about a thousand times safer and easier to start with off-the-shelf solid rockets. Don't even consider ...
- 172k
10
votes
The thrust in the calculation of specific impulse
There's no "the" specific impulse, in the sense that the performance of a rocket engine varies over time. For a given moment in time, the instantaneous specific impulse can be derived from ...
9
votes
Why sugar is not commonly used as fuel in hybrid rocket engine?
Short answer: Rubber gives you better performance
Longer answer:
We first have to find out, why some propellants are used in different situations. There are different parameters that matter. Just from ...
- 4,266
9
votes
Why sugar is not commonly used as fuel in hybrid rocket engine?
A supplement to TrySCE2AUX:
Is it even possible to use sugar in a hybrid rocket? According to Clarks' Ignition, the engineering of workable hybrid rocket engines is very complicated and tricky to get ...
- 9,517
8
votes
Accepted
How would E85 work as rocket fuel?
Which one? Which supplier, which brand, which set of additives, what content of impurities?
That matters. This is why rockets fly on RP-1, not on JP-1 kerosene - because the standard for JP-1 is crap,...
- 56k
8
votes
Accepted
How does spin stabilization intuitively work?
Preamble
Conservation laws may never be intuitive; what makes them laws is simply that after all this time we've never seen exceptions to them or the things that imply them.
Conservation of angular ...
- 151k
7
votes
Open source liquid rocket engine
Several papers have been published on liquid rocket engines. Below is a collection of some. Some links are from ResearchGate so you need an account there (free for academics/students).
With 3D files:
...
- 1,483
6
votes
What is the feasibility of a rocket hobbyist achieving a LEO orbit with a microsat?
It's probably good to bring up Copenhagen Suborbital up as a reference here. They're quite possibly the most competent amateur rocketeers, yet their name already points out that they're not aiming for ...
- 1,654
6
votes
Accepted
new nozzle design, is it a fail?
Bernoulli's principle only applies to incompressible flow. Once you go compressible, especially when you go supersonic, things become counterintuitive. This design will limit you more or less to an ...
- 17.4k
6
votes
Is it possible to reach space using home-made rocket?
Although it stretches the definition of home made, JP Aerospace is a very small company run by John Powell. They started out attempting just that. Their current plan is to build an airship that is a ...
- 910
6
votes
Would a 'small' rocket like this reach space?
Since you added that drawing I am adding this answer to specifically address your drawing:
No. It will not reach space.
Note that there is nowhere near enough information in your drawing to reach ...
- 11.7k
6
votes
Could HIBEX propellant be used for amateur rockets?
"Yes", but that would sort of be silly and it would highly depend on where you live, since it may be illegal in your country to mix your own rocket propellant. HIBEX used what is ...
- 6,300
6
votes
How does spin stabilization intuitively work?
The most intuitve way to explain spin stabilization would be a spinning top, e.g. this one:
Youtube Clip of a spinning top
You can imagine the satellite as the spinning top, as long it is spinning, it ...
- 3,337
5
votes
Building a ultra-small almost space vehicle
You will have quite a challenge to get to 50 km with a balloon or reasonable sized rocket. Even weather balloons don't hit those altitudes. Probably one of the best places to start for this kind of ...
- 851
5
votes
What materials should I use to make a suborbital amateur rocket and where can I buy them?
Titanium is too ambitious for a first project. It's difficult to machine and weld. It's also overkill: even many orbital rockets use aluminium hulls. Amateur rockets generally use plastic bodies.
To ...
- 130k
5
votes
Accepted
I don't know where to start with the calculations - rocket engine
The reason you can't finish your calculations is that you are missing half of the engine. You are going to have to make some decisions about the nozzle in order to get exhaust velocity.
I'll make some ...
- 189k
5
votes
Tilted exhaust gases from the rocket nozzle after sonic boom
What is the condition of the nozzle after burnout? is it asymmetrically eroded? That points to nozzle failure.
If it is spitting chunky sparks, then your fuel grain is fracturing and you are operating ...
5
votes
Calculating the projectile of rocket using RCS to tilt the flight path
You're lacking some essential data.
If the rocket flies in the atmosphere, pretty much all bets are off, because it will have some sort of stabilization whose influence on the trajectory and ...
- 56k
4
votes
How did the GoFast 2014 Rocket de-spin?
Around 03:45 in the linked video you can see (both?) Yo-Yo(s) deployed and move away from the spacecraft. The frame with the red box shows a small object which may ...
- 151k
4
votes
Is it possible to reach space using home-made rocket?
Yes! I discussed this with a person a few months ago, to include a few of the things mentioned here by others. We also discussed the balloon being solar powered.
The idea here is using a balloon to ...
- 131
4
votes
How easy is it to use liquid nitrogen dioxide as an oxidizer?
NO2/N2O4 is quite poisonous by the standards of amateur propellants, not an expert but not aware of any amateurs using it. N2O is common but at room temperature it's only a liquid at high pressures so ...
- 481
Only top scored, non community-wiki answers of a minimum length are eligible