The Naked Scientists

The Naked Scientists Forum

Author Topic: Can calcium carbide be used as rocket fuel?  (Read 8452 times)

Offline Naufal the B. S.

  • Sr. Member
  • ****
  • Posts: 179
    • View Profile
Can calcium carbide be used as rocket fuel?
« on: 22/07/2009 12:12:12 »
Can I use Calcium Carbide as rocket fuel?
How can I make it?
« Last Edit: 23/07/2009 21:13:45 by chris »


 

Offline Mazurka

  • Hero Member
  • *****
  • Posts: 510
    • View Profile
Re: Can calcium carbide be used as rocket fuel?
« Reply #1 on: 22/07/2009 12:55:50 »
If you add water to calcium carbide, it produces acetylene, so in principle you could use it as a rocket fuel.  Whether it is practical or not is a differnt question...
 

Offline Bored chemist

  • Neilep Level Member
  • ******
  • Posts: 8669
  • Thanked: 42 times
    • View Profile
Re: Can calcium carbide be used as rocket fuel?
« Reply #2 on: 22/07/2009 19:47:57 »
Since acetylene is noted for exploding under pressure (even without oxygen) it would be a poor choice for a rocket fuel.
Also, the reaction of carbide with water produces a sludgy mess which will bung up the rocket nozzle.
 

Offline Make it Lady

  • Neilep Level Member
  • ******
  • Posts: 4050
  • Hands-on fun for everyone!
    • View Profile
Re: Can calcium carbide be used as rocket fuel?
« Reply #3 on: 22/07/2009 21:22:58 »
Can you explain more about your rocketeering Naufal. I luff backyard rockets.
 

Offline Naufal the B. S.

  • Sr. Member
  • ****
  • Posts: 179
    • View Profile
Re: Can calcium carbide be used as rocket fuel?
« Reply #4 on: 23/07/2009 10:22:00 »
So... The calcium carbide fuel is liquid!

Mean... I just pour the calcium carbide (liquid) into my rocket and...

How can I ignite the liquid CaC2!?
 

Offline Chemistry4me

  • Neilep Level Member
  • ******
  • Posts: 7709
    • View Profile
Re: Can calcium carbide be used as rocket fuel?
« Reply #5 on: 23/07/2009 10:32:48 »
Huh? Have you been reading the posts in this thread??
 

Offline Naufal the B. S.

  • Sr. Member
  • ****
  • Posts: 179
    • View Profile
Re: Can calcium carbide be used as rocket fuel?
« Reply #6 on: 23/07/2009 10:43:13 »
Can you explain more about your rocketeering Naufal. I luff backyard rockets.
This is my second rocketry project. The first project was
to fail(messy rocket). I choose the CaC2 for my Calcium Carbide, because I don't want monitored by government(blackpowder fuel...). And the CaC2 is more easily to get it than blackpowder.

And I'm planning to make 1 pack matches + aluminium foil!

And the conclusion, I'm newbie.

How do you do?
 

Offline Naufal the B. S.

  • Sr. Member
  • ****
  • Posts: 179
    • View Profile
Re: Can calcium carbide be used as rocket fuel?
« Reply #7 on: 23/07/2009 10:47:58 »
Huh? Have you been reading the posts in this thread??
What's your purpose!?
 

Offline Chemistry4me

  • Neilep Level Member
  • ******
  • Posts: 7709
    • View Profile
Re: Can calcium carbide be used as rocket fuel?
« Reply #8 on: 23/07/2009 10:55:46 »
You're not burning the calcium carbide, rather the ethyne.
 

Offline Bored chemist

  • Neilep Level Member
  • ******
  • Posts: 8669
  • Thanked: 42 times
    • View Profile
Re: Can calcium carbide be used as rocket fuel?
« Reply #9 on: 23/07/2009 19:44:24 »
"I just pour the calcium carbide (liquid) into my rocket and..."
Calcium carbide melts at about 2200C. Steel melts at about 1600C
What, exactly, are you going to make this rocket out of?

You clearly have so little idea of what you are doing that you should stop before you hurt someone- most probably yourself.
 

Offline chris

  • Neilep Level Member
  • ******
  • Posts: 5339
  • Thanked: 65 times
  • The Naked Scientist
    • View Profile
    • The Naked Scientists
Can calcium carbide be used as rocket fuel?
« Reply #10 on: 23/07/2009 21:14:46 »
BC - what is the basis of acetylene exploding under pressure? What's going on when this happens?
 

Offline wolfekeeper

  • Neilep Level Member
  • ******
  • Posts: 1092
  • Thanked: 11 times
    • View Profile
Can calcium carbide be used as rocket fuel?
« Reply #11 on: 23/07/2009 23:12:21 »
From a quick web search I think it just prefers to be hydrogen and carbon and if you put it under pressure it has more chances to convert, and it's exothermic, and high temperatures increase the rate of conversion.

Boom!
 

Offline Naufal the B. S.

  • Sr. Member
  • ****
  • Posts: 179
    • View Profile
Can calcium carbide be used as rocket fuel?
« Reply #12 on: 23/07/2009 23:53:09 »
What! 2200oC!
Wow, the air will make high pressure.

Btw, how much temperature is the blackpowder rocket?

Once again, are the matches rocket will explode, if I put +30 matches in the aluminium foil.
 

Offline wolfekeeper

  • Neilep Level Member
  • ******
  • Posts: 1092
  • Thanked: 11 times
    • View Profile
Can calcium carbide be used as rocket fuel?
« Reply #13 on: 24/07/2009 00:23:44 »
2200C isn't hot for a rocket, combustion is usually nearer to 3500K/3200C.

 

Offline Chemistry4me

  • Neilep Level Member
  • ******
  • Posts: 7709
    • View Profile
Can calcium carbide be used as rocket fuel?
« Reply #14 on: 24/07/2009 05:18:36 »
Once again, are the matches rocket will explode, if I put +30 matches in the aluminium foil.
I'm not sure what you're saying but NO, it will not.
 

Offline Bored chemist

  • Neilep Level Member
  • ******
  • Posts: 8669
  • Thanked: 42 times
    • View Profile
Can calcium carbide be used as rocket fuel?
« Reply #15 on: 24/07/2009 06:56:49 »
2200C isn't hot for a rocket, combustion is usually nearer to 3500K/3200C.


So what?
Did you actually read what I posted? It was a question but nobody has answered it yet.
 

Offline wolfekeeper

  • Neilep Level Member
  • ******
  • Posts: 1092
  • Thanked: 11 times
    • View Profile
Can calcium carbide be used as rocket fuel?
« Reply #16 on: 24/07/2009 09:36:43 »
Can you explain more about your rocketeering Naufal. I luff backyard rockets.
This is my second rocketry project. The first project was
to fail(messy rocket). I choose the CaC2 for my Calcium Carbide, because I don't want monitored by government(blackpowder fuel...). And the CaC2 is more easily to get it than blackpowder.

And I'm planning to make 1 pack matches + aluminium foil!

And the conclusion, I'm newbie.

How do you do?
Trying to invent your own rocket fuel is *extremely* dangerous and anyway very unlikely to give good results.

Anyway do a search for cpropep web- this is an online service for predicting the performance of propellants mixes- but you should stay away from acetylene.

FWIW I once read a discussion where rocket engineers where trying to come up with the least practical (but highest performance) propellant mix. The mix they came up with was liquid ozone and acetylene. Either propellant on its own is a notoriously touchy explosive ;-) Nobody was ever insane enough to try it.

Stay away from acetylene!!!
 

Offline Naufal the B. S.

  • Sr. Member
  • ****
  • Posts: 179
    • View Profile
Can calcium carbide be used as rocket fuel?
« Reply #17 on: 24/07/2009 11:26:17 »
So... I'm a first man which use the acetylene for rocket!

Wow, I'm an inventor! Just kidding  :D

Why it *extremly* dangerous!?

I'm curiousty. And I'll get the CaC2 easily than BP.
 

Offline Chemistry4me

  • Neilep Level Member
  • ******
  • Posts: 7709
    • View Profile
Can calcium carbide be used as rocket fuel?
« Reply #18 on: 24/07/2009 11:36:30 »
Quote
samples of concentrated or pure acetylene will explosively decompose. Acetylene can explode with extreme violence if the pressure of the gas exceeds about 200 kPa (39 psi) as a gas or when in liquid or solid form.

http://en.wikipedia.org/wiki/Acetylene#Safety_and_handling
 

Offline Naufal the B. S.

  • Sr. Member
  • ****
  • Posts: 179
    • View Profile
Can calcium carbide be used as rocket fuel?
« Reply #19 on: 24/07/2009 11:43:54 »
Will the pressure aim down because of nozzle?
 

Offline Chemistry4me

  • Neilep Level Member
  • ******
  • Posts: 7709
    • View Profile
Can calcium carbide be used as rocket fuel?
« Reply #20 on: 24/07/2009 11:46:39 »
If that is how you have designed the rocket then yes, most likely it will.
 

Offline Naufal the B. S.

  • Sr. Member
  • ****
  • Posts: 179
    • View Profile
Kno3a
« Reply #21 on: 25/07/2009 01:55:58 »
So... Will it aim to me and everybody around me?
 

Offline Chemistry4me

  • Neilep Level Member
  • ******
  • Posts: 7709
    • View Profile
Can calcium carbide be used as rocket fuel?
« Reply #22 on: 25/07/2009 02:58:21 »
Umm...if you're rocket is badly designed, yes, it will.
 

Offline Naufal the B. S.

  • Sr. Member
  • ****
  • Posts: 179
    • View Profile
Is the bernoulli concept...a
« Reply #23 on: 25/07/2009 03:19:36 »
Btw, what's the good material for my rocket? I'm planning with 15 cm pvc, cardboard fins, and... I've been confused with the nozzle.
 

Offline Chemistry4me

  • Neilep Level Member
  • ******
  • Posts: 7709
    • View Profile
Can calcium carbide be used as rocket fuel?
« Reply #24 on: 25/07/2009 03:26:15 »
Ah, you have finally answered the previously unanswered question.
I think you should just give up right now.
 

The Naked Scientists Forum

Can calcium carbide be used as rocket fuel?
« Reply #24 on: 25/07/2009 03:26:15 »

 

SMF 2.0.10 | SMF © 2015, Simple Machines
SMFAds for Free Forums