othom26
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sending my pi into space

Thu Jun 06, 2013 6:10 am

i intend to use my pi (or several) to control the avionics, turbine, parachute and fuel inlet

im using a turbine from the american affordable weapons tech program

if anyone has any suggestions, ideas id love to hear them

othom26
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Re: sending my pi into space

Thu Jun 06, 2013 7:22 am

does anyone else think this is a good idea for am i just gonna cock up and its gonna explode?

Heater
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Re: sending my pi into space

Thu Jun 06, 2013 8:09 am

othom26,
im using a turbine from the american affordable weapons tech program
Now I have never been into space but it is my understanding that turbines don't work up there.
Any links to that turbine tech? Sounds interesting.

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RaTTuS
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Re: sending my pi into space

Thu Jun 06, 2013 8:14 am

Heater wrote:othom26,
im using a turbine from the american affordable weapons tech program
Now I have never been into space but it is my understanding that turbines don't work up there.
Any links to that turbine tech? Sounds interesting.
also a parachute is not need to get up and is pretty useless when there
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Jezmo
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Re: sending my pi into space

Thu Jun 06, 2013 8:29 am

Hmmmm
using a device which has been designed as an educational toy rather than an embedded control system designed to withstand the rigors of flight may well end in tears. But since nobody is actually going to die when it crashes and burns... what the hell give it a go.

Real flight control systems are slightly more complex being built to be fail safe and fault tolerant, but then they do take many man years to design and cost rather more than a pi

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Re: sending my pi into space

Thu Jun 06, 2013 8:38 am

This does kind of raise the serious issue which causes professional engineers a lot of headaches which is people specifying a pi in situations in which it is clearly not safe, there are some some serious issues involved, am I am not saying this project in particular is dangerous, but it is dangerous allowing people who know nothing or next to nothing about hardware specifying a pi in industrial control systems.

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Re: sending my pi into space

Thu Jun 06, 2013 8:54 am

This is what annoys people who hardware design for a living, people using a toy to do real control systems.

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Re: sending my pi into space

Thu Jun 06, 2013 9:24 am

This project is indeed dangerous, since something falling from 60miles up (Space) will be falling at many hundreds of MPH and could land anywhere.

I hope OP knows the regulatory hurdles he will have to go through to launch this, but since a turbine won't work above about 90kft he has no chance of reaching space anyway. That said, even a fall from 90kft is going to make a big hole when it lands.
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Re: sending my pi into space

Thu Jun 06, 2013 10:14 am

othom26,

Before you start building a missile based on a "turbine from the american affordable weapons tech program", let alone flying it, you might want to check what happened to Bruce Simpson who started to build his "Do It Yourself Cruise Missile"
http://www.interestingprojects.com/cruisemissile/

By the way how on earth do you expect to be able to get hold of anything from any American affordable weapons tech program?

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rpdom
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Re: sending my pi into space

Thu Jun 06, 2013 10:20 am

I doubt it'll ever work anyway. The voltage losses on a microusb lead that long will be astronomical :lol:

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Re: sending my pi into space

Thu Jun 06, 2013 10:28 am

@rpdom

LOL.


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Re: sending my pi into space

Thu Jun 06, 2013 10:49 am

By the way how on earth do you expect to be able to get hold of anything from any American affordable weapons tech program?

I am shocked that you haven't got one, I thought everyone had one.

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Re: sending my pi into space

Thu Jun 06, 2013 11:20 am

Legal fluff, cost, logistics and propulsion issues aside...

the soc is not radhardened -at all-. Yay, memory corruption and a completely scrambled SD card. :D

Also I can see the headline now:

BREAKING NEWS: Pi in the sky kills man - eyewitnesses describe the graphic scene as John Smith, 27, gets hit edge-on by a Raspberry Pi at 350mph

...*ouch*...
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mrpi64
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Re: sending my pi into space

Thu Jun 06, 2013 12:41 pm

what a nice idea!
I'm happy to help.
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meltwater
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Re: sending my pi into space

Thu Jun 06, 2013 12:47 pm

LlyrP wrote:Legal fluff, cost, logistics and propulsion issues aside...

the soc is not radhardened -at all-. Yay, memory corruption and a completely scrambled SD card. :D

Also I can see the headline now:

BREAKING NEWS: Pi in the sky kills man - eyewitnesses describe the graphic scene as John Smith, 27, gets hit edge-on by a Raspberry Pi at 350mph

...*ouch*...
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Re: sending my pi into space

Thu Jun 06, 2013 1:04 pm

othom26 wrote: im using a turbine from the american affordable weapons tech program

does anyone else think this is a good idea for am i just gonna cock up and its gonna explode?
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solar3000
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Re: sending my pi into space

Thu Jun 06, 2013 1:10 pm

mikerr wrote:
othom26 wrote: im using a turbine from the american affordable weapons tech program

does anyone else think this is a good idea for am i just gonna cock up and its gonna explode?
Image

ouch. did this guy make it into space too?
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Re: sending my pi into space

Thu Jun 06, 2013 1:11 pm

That's one small step for a geek... :)

But seriously, high altitude rocketry (even if only sub-orbital) is not going to be a cheap hobby. If you can afford that much hardware and fuel, you can afford a "proper" control system and hire the necessary PhDs to design the control software to make it fly in a straight line at high mach numbers.

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Re: sending my pi into space

Thu Jun 06, 2013 1:56 pm

Ravenous wrote:That's one small step for a geek... :)

But seriously, high altitude rocketry (even if only sub-orbital) is not going to be a cheap hobby. If you can afford that much hardware and fuel, you can afford a "proper" control system and hire the necessary PhDs to design the control software to make it fly in a straight line at high mach numbers.
Very well put.

You will also need to consider the affect that cosmic radiation has on electronics and that the Raspberry Pi has not been built to withstand the levels that prevail in space.

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mdax
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Re: sending my pi into space

Thu Jun 06, 2013 2:04 pm

Throw caution to the wind and launch that thing!

Ravenous
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Re: sending my pi into space

Thu Jun 06, 2013 2:12 pm

mdax wrote:Throw caution to the wind and launch that thing!
She canna take any more power, Captain! :)

Seriously othom26 is correct about the turbine by the way - they'd be needed as fuel pumps to get fuel & oxidiser to the engine itself. That's a significant project on its own I suspect...

NathanBookham
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Re: sending my pi into space

Thu Jun 06, 2013 3:27 pm

This whole thing sounds stupidly awesome and dangerous at the same time :lol: !
This is what it would look like after re-entry http://img808.imageshack.us/img808/453/ ... losion.jpg
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Re: sending my pi into space

Thu Jun 06, 2013 3:34 pm

I suggest people take a look at the Armadillo aerospace website for how to get to almost space on a budget (well, about $10M which is peanuts for an actual space shot with decent HW). There is also the SugarShotToSpace project which is worth a look - much cheaper but they still haven't got to Space.

Also interesting to note the the SpaceX dragon series of rockets don't use rad hardened CPU's IIRC, but have multiple devices that cross check each other and vote.
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Re: sending my pi into space

Thu Jun 06, 2013 3:58 pm

but have multiple devices that cross check each other and vote.
For £1000 they will ask the other devices a question of your choice.
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Re: sending my pi into space

Thu Jun 06, 2013 6:19 pm

MattHawkinsUK wrote:
but have multiple devices that cross check each other and vote.
For £1000 they will ask the other devices a question of your choice.
Do they do phone a friend as well? Or does the comms chip need rad hardening for that? :lol:
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