Naked Science Forum

Non Life Sciences => Physics, Astronomy & Cosmology => Topic started by: Naufal the B. S. on 01/08/2009 04:44:26

Title: How do liquid fuelled rockets and solid liquid fuelled rockets differ?
Post by: Naufal the B. S. on 01/08/2009 04:44:26
What is the difference between liquid fueled rocket motors and solid liquid rocket motors?
Title: Re: How do liquid fuelled rockets and solid liquid fuelled rockets differ?
Post by: Chemistry4me on 01/08/2009 04:46:51
The liquid propellants require some complicated piping and pumping equipment to feed their engines. They can provide greater propulsive thrust and throttle their power, but take time to build up this thrust when first ignited.
Title: Re: How do liquid fuelled rockets and solid liquid fuelled rockets differ?
Post by: Naufal the B. S. on 01/08/2009 04:49:38
How to drive the pumps?
Please help me...
Title: Re: How do liquid fuelled rockets and solid liquid fuelled rockets differ?
Post by: Chemistry4me on 01/08/2009 05:09:16
I think they use a gas turbine for the rocket engine to pump fuel and oxidizer into their combustion chamber.

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It's going to look something like this

(https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2Fupload.wikimedia.org%2Fwikipedia%2Fcommons%2F3%2F3d%2FNASA_bipropellant_Lrockth.png&hash=9dfdc9646ddbc348162ea392467fda91)
Title: Re: How do liquid fuelled rockets and solid liquid fuelled rockets differ?
Post by: Naufal the B. S. on 01/08/2009 05:15:38
Did it driven by motor?
Title: Re: How do liquid fuelled rockets and solid liquid fuelled rockets differ?
Post by: Chemistry4me on 01/08/2009 09:00:08
No, I don't think they are.
A rocket engine is basically throwing mass in one direction and benefiting from the reaction that occurs in the other direction as a result.
Title: How do liquid fuelled rockets and solid liquid fuelled rockets differ?
Post by: Bored chemist on 01/08/2009 11:28:29
The pumps are probably driven by motors. They might be driven by a small engine running from the same fuel and oxidiser as the main rocket.
You can only do this with fairly big rockets otherwise the extra weight of the pumps and so on makes the thing too heavy to fly.
Title: Please, help my city from disaster
Post by: Naufal the B. S. on 01/08/2009 13:20:23
Why "rocketeer legend" (von braun, goddard, etc) didn't mix oxidizer and fuel directly like bp (kno3 + c)?
Title: Please, help my city from disaster
Post by: Naufal the B. S. on 01/08/2009 14:12:01
But rather, they used pump to mix oxidizer and fuel
Title: How do liquid fuelled rockets and solid liquid fuelled rockets differ?
Post by: Bored chemist on 02/08/2009 13:57:39
Why
Title: How do liquid fuelled rockets and solid liquid fuelled rockets differ?
Post by: Bored chemist on 02/08/2009 14:01:46
the double post?
Anyway the answer is that if you mix the things they used as liquid fuel and oxidiser theygenerally  react and catch fire. Some of the things they used like liquid oxygen and alcohol can't be mixed because one of them needs to be kept very cold.

Even the ones where you can mix them without the reaction starting would give you a mixture that was almost certain to explode.
The point is that they cannot react until you mix them so up till that point they are relatively safe.
That means that you can use really dangerous "mixes" for liquid fueled rockets.
That means that you probaly shouldn't even try to copy them.
Title: KNO3 can be found in toothpaste?j
Post by: Naufal the B. S. on 02/08/2009 14:03:28
Why?
Title: How do liquid fuelled rockets and solid liquid fuelled rockets differ?
Post by: Bored chemist on 02/08/2009 16:42:28
Because you will probably kill yourself.