/sci/ - Science & Math

>>4168697

I think once you start talking about the weights of these rockets hydrogen/helium balloons get prohibitively expensive. You need a big ass balloon for something this size.

One thing these guys keep repeating is the focus on a single stage. No one has got to orbit with a single stage.

http://www.ddeville.com/derek/CSXT.htm

72 mile altitude, 21ft tall, 724lb lift off weight, 435lb fuel, Mach 5

>>4167686 OP, for your own sake, just stop. I was hoping your ignorance would prevent you from actually producing anything potentially harmful, but it is becoming exceedingly clear that you have every intention of blowing yourself up.

I appreciate your concern but I'm not interested in blowing myself up. Health and safety is driving my design which is why I'm imposing a weight limit per cake and avoiding liquid oxygen motors.

>>4168619

>>4168601

This guy made one a Saturn V model at 36ft tall with 1400lbs of fuel and only reached 4440ft which is pretty poor tbh. That was made from wood and fibreglass.
http://www.popularmechanics.com/science/space/rockets/4315103

>>4168466 >>Also which one is more interesting for a person who is into programming, computers and /g/-stuff?
>Electrical

Not necessarily. Mechanical engineers still work with programming and circuitry, it all depends on what your focus will be.

Undergraduate mechanical may appear to be easier at first because you have to study a little bit of EVERYTHING. Graduate mechanical is where shit gets real and you focus research on advanced, very complicated, topics.

>>4167990 Japanese Lambda + Indonesian RPS-420

I've never heard of those before, thanks. Indonesia barely counts as a country so they don't count. The Japanese one DID work with a success rate of 82%, I know I'm not perfect and am expecting some failures so 82% is my minimum acceptable rate.

16m x 0.75m is a bit OTT.

http://sugarshot.org/project_description.html

These guys are using sugar mix alone and their rocket is barely that size.

>>4168149 Chlorates lol

It's what they use in all of the professional motors although they have access to Ammonium Perchlorate which is probably better but I've never seen it available.

I'm starting work on a method to produce KClO3 in bulk, cheaply. Electrolyse some NaCl -> to get NaClO3 -> Add KCl and precipitate KClO3. Once there is enough of this built up I can begin on a series of 'fuel cakes'.

Each cake will be approximately 100g with its desired core shaped in the center. These cakes will be stacked and stuck inside the combustion chamber. This will grant me highly consistent burn patterns and a lot of control over the entire core profile.

It will be almost trivial to get the desired velocity with this fuel. I expect a month will be wasted figuring out the optimum configuration and placement of motors.

I need 17,500mph to land me in a similar orbit to the ISS

With rocket power it's achievable.

The rocket was loose and free to move in that brace.

Maybe the thrust twisted it in the hole, locking it instead of letting it push perpendicular to the scale

Just tried it with the scales but it didn't register anything so they must be broken or something.


http://www.youtube.com/watch?v=6EBmIlpTHQQ

>>4165926
I have the internet and my own brain

Anyone got ideas for measuring force accurately?

Was thinking a piece of flexible steel overhanging something and taking a measurement of how much it bends but I would need good values on the properties of the steel.

Dual test - http://www.youtube.com/watch?v=qitNsfwm-Xs

Chlorate + Al http://www.youtube.com/watch?v=PD7pbVmgnzY

A reactor for chlorate production will be on its way

Videos are in the process of being uploaded to the official /sci/-unkworks youtube channel

Tested some full chlorate mixes and tbh they're looking like the only realistic booster that isn't hybrid.

First chlorate test used both nozzles. Fuel mix of 7.2:3.5 KClO3:Icing sugar.

Second chlorate test used 6.5:3.5:0.3 KClO3:Icing sugar:Al powder (spherical)

Second test the casing was noticeably hotter than first, this was to be expected because of adding Al. First test could have been handled by bare hand without much cooling time.

All videos will be available shortly
http://www.youtube.com/watch?v=UobH4XL4jls

>>4165319

It's designed to built and fueled in separate pieces for convenience.

This shape also allows us to plug a complete engine onto the bottom of next stage during the casting without complicated release mechanisms. This will open the possibility to large rockets made in many small bits benefiting from the constant shedding of excess material.

Larger modular hybrid motor.

Will be cast KNO3 mix with a compressed air inlet at the top. Al powder may be added to increase burn temperature and momentum per unit fuel

Second nozzle test fire videos are up. I've included my spreadsheet data and 3d files.

http://www.megaupload.com/?d=5WADH9G4

>>4157972

lol'd

/sci/ can beat that with less animal cruelty

>>4165086
>implying I haven't heard of impulse

I'll be getting to it.I know rockets are inefficient but being able to know the efficiency will let me know how much energy is being lost within the rest of the vessel. Important for designing the structure of more crazy powered engines.

>>4164979

But I have to understand how much energy there should be available in perfect conditions for accelerating the mass in order to know realistically efficient it is.

I'm not ignoring those equations but without a figure for pressure or velocity they're not relevant yet.

Has anyone got rocketry resources they want to spam, this would be the thread to do it.

>>4164823

Change in movement requires acceleration

Change in energy does not always necessarily mean movement

>>4160311 unless the professor decides to be incredibly merciful.
>>4160311 professor

But you're in high school...

>>4157029

So I tried some calculations with these numbers to approximate how much of the energy the mass takes on per second and used this to estimate the power output.

I've slipped up somewhere.

Think I've caught a disease because of christmas shopping. Sick people more likely to be going into an already a more heavily densely populated public area. Early rest for now. I'll make a rar with the solidworks files and spreadsheet

>>4159451
I'm not talking about model rockets, this thing has to get out of the atmosphere consistently. Other materials will be considered for other bits but steel is the cheapest and strongest for now.