rAiN_Twist
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How high would you need to get before it would look as if you were in space? (Through a GoPro)
rAiN Twist - YouTube
rAiN Twist - YouTube
Will a jet engine work?
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DavidMcCann
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the higher I get, the lower my apparent altitude.
rAiN_Twist
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Is there a altitude where you can see the black of space, but your still in earths atmosphere?
Edit: Just like the picture in the thumbnail of the video. Is there any height that would make it appear your that high? [video=youtube;JakicLZgN-o]https://www.youtube.com/watch?v=JakicLZgN-o[/video]
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bobkrech
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You might want to look at this website to get a simple understanding on what it takes to make a rocket get to a given altitude.
https://www.rocketmime.com/rockets/rckt_eqn.html
This website was written by an Eagle Scout Project by Randy Culp several years ago, and is a very well written example of simple approach to the math involved in rocketry.
The video above is of a professional sounding rocket on a ballistic flight into space. It is a similar profile to the early suborbital Mercury rocket flights with a duration of ~15 minutes. Projects on this scale cost several hundred thousand dollars.......
https://www.rocketmime.com/rockets/rckt_eqn.html
This website was written by an Eagle Scout Project by Randy Culp several years ago, and is a very well written example of simple approach to the math involved in rocketry.
The video above is of a professional sounding rocket on a ballistic flight into space. It is a similar profile to the early suborbital Mercury rocket flights with a duration of ~15 minutes. Projects on this scale cost several hundred thousand dollars.......
rAiN_Twist
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boatgeek
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If you can build a jet engine, you have the skills and tools to do a lot of this work yourself. It's probably only a MS degree, 5-10 years work experience at Rolls-Royce or GE, and a million or so dollars worth of tools...
It seems like the answer would be to use a jet to take it as high as it can, then dump it like a first stage and go up on rocket power, rather than taking jet oxidizer with you. I'd still buy the jet, though.
rAiN_Twist
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I can make one, the engine isn't so hard to make (the reason it took them a while is because it was huge) it's trying to get the air/fuel ratios correct
rAiN Twist - YouTube
Idk about that, but I think a 6" three stage fitted with high performance motors (which would be maybe a P or a Q motor) and with an optimized shape could get up to 300,000 ft or maybe even higher (by comparison, the CXST went to 380,000 ft). I'm not too sure about this though I just did it out of the top of my head.
However, I don't think you could get a single staged rocket (I'm assuming that's the kind of rocket that you're talking about) 6 ft tall and under 8" in diameter to go to space, simply because it doesn't have enough firepower. The CSXT rocket was 10" in diameter and 21 ft long. The edge of space is 62 miles and the rocket went 72 miles high, which is 10 miles (or 52000 ft) over the boundary. By comparison the CSXT rocket is 3.5 times longer than the rocket and 4" wider. Plus, you would also have to focus on aerodynamic heating, since chances are the rocket will be going mach 5+ so you would have to put alot of insulation on it which would add alot of weight.
Anyway, I've provided a link with some information about the CSXT program, the page is pretty interesting and it gives some specs on the size of the rocket as well as its performance.
https://www.ddeville.com/derek/CSXT.htm
And finally, if you want to design rockets of your own, i would suggest the openrocket program, its very easy to use and can also be a helpful tool if you're designing rockets.
https://openrocket.sourceforge.net/
Hope this information helps.
TRFfan
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Yes, i think at 90,000 ft you would be able to see the blackness of space. There's a video on the forum of Jim Jarvis's three stager going up to 130,000 ft (it would have flew up to 150k but i think there was some technical problems though) and at that point to can clearly see the blackness of space.
https://youtu.be/eHloNCGlYz4
If you want to put a small diameter rocket into space, look into boosted darts. Like the Loki. With a larger enough booster, about 5" and full of APCP and a dart on top, you might get the dart to space with much less then a S 50150 motor.
You will still need to design and build a scratch built rocket and mix your own propellant, build your own motor. I don't believe any commercial motor is going to do the job. At least not one that can be bought by anyone but the US Government.
You will still need to design and build a scratch built rocket and mix your own propellant, build your own motor. I don't believe any commercial motor is going to do the job. At least not one that can be bought by anyone but the US Government.
bobkrech
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This is the commercial version of the CSXT rocket. https://www.upaerospace.com/SpaceLoft-Launch-Vehicle.htmlIdk about that, but I think a 6" three stage fitted with high performance motors (which would be maybe a P or a Q motor) and with an optimized shape could get up to 300,000 ft or maybe even higher (by comparison, the CXST went to 380,000 ft). I'm not too sure about this though I just did it out of the top of my head.
However, I don't think you could get a single staged rocket (I'm assuming that's the kind of rocket that you're talking about) 6 ft tall and under 8" in diameter to go to space, simply because it doesn't have enough firepower. The CSXT rocket was 10" in diameter and 21 ft long. The edge of space is 62 miles and the rocket went 72 miles high, which is 10 miles (or 52000 ft) over the boundary. By comparison the CSXT rocket is 3.5 times longer than the rocket and 4" wider. Plus, you would also have to focus on aerodynamic heating, since chances are the rocket will be going mach 5+ so you would have to put alot of insulation on it which would add alot of weight.
Anyway, I've provided a link with some information about the CSXT program, the page is pretty interesting and it gives some specs on the size of the rocket as well as its performance.
https://www.ddeville.com/derek/CSXT.htm
And finally, if you want to design rockets of your own, i would suggest the openrocket program, its very easy to use and can also be a helpful tool if you're designing rockets.
https://openrocket.sourceforge.net/
Hope this information helps.
TRFfan
The CSXT GoFast rocket was hardly an amateur effort. There were many professionals involved in the project who did not receive compensation for their contributions....
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A problem with high performance boosted darts, and for that matter multi-stage, is that WE are required to recover the stages. That hurts the mass fraction and adds a little bit of drag.
The problem with single stage, is it just doesn't quite get you to space unless it is a pretty large single stage (from the perspective of hobby rocketry) - think Astrobee-D for a starting point. https://www.designation-systems.net/dusrm/app4/astrobee.html I think that could be duplicated by a dedicated team with some experience. No fairy dust required. Much smaller diameter can get you half way there, if it doesn't burn up or shred from cutting the margins on lots of design factors a little close (based on my sims) and pushing over M5 at a bit too low an altitude. Translation - If you push the odds on lots of design factors, the cumulative odds of it working get rather small. Translation 2 - That also means LOTS of tests may be needed to have reasonable hope of it working reliably, if you can do it at all.
Gerald
The problem with single stage, is it just doesn't quite get you to space unless it is a pretty large single stage (from the perspective of hobby rocketry) - think Astrobee-D for a starting point. https://www.designation-systems.net/dusrm/app4/astrobee.html I think that could be duplicated by a dedicated team with some experience. No fairy dust required. Much smaller diameter can get you half way there, if it doesn't burn up or shred from cutting the margins on lots of design factors a little close (based on my sims) and pushing over M5 at a bit too low an altitude. Translation - If you push the odds on lots of design factors, the cumulative odds of it working get rather small. Translation 2 - That also means LOTS of tests may be needed to have reasonable hope of it working reliably, if you can do it at all.
Gerald
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