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hybrid rocket

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hybrid rocket

Unread postAuthor: homedepotpro » Fri Dec 07, 2007 10:44 pm

im trying to build a hybrid rocket, and i need held finding/casting my solid fuel. Anyone who has experience in the field of amateur rocket, your help would be greatly appreciated. I am working of a 1''x6'' motor and am hoping to build a 1.5''x10'' motor later (if i can get the concept down)
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Unread postAuthor: Fnord » Fri Dec 07, 2007 10:55 pm

Didn't the mythbusters just use some wax mixed with carbon? That would seem a good choice as it worked well and was cheap.
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Unread postAuthor: Novacastrian » Fri Dec 07, 2007 11:54 pm

What exactly do you mean by "Hybrid" rocket?
Excuse my stupidity.
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Unread postAuthor: homedepotpro » Sat Dec 08, 2007 12:22 am

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Unread postAuthor: Novacastrian » Sat Dec 08, 2007 12:45 am

That video was quite impressive, my idea is this- Find a cardboard tube that fits inside your chamber, a metal rod the size of the desired id of the chamber and a heat source. Lube the rod- make central to the cardboard tube (mould like) and pour in your tar. I don't know what tar i would use though.
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Unread postAuthor: homedepotpro » Sat Dec 08, 2007 1:08 am

yeah the tar is the problem, it is a huge unknown. I want to use ABS but Im not sure.
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Unread postAuthor: Novacastrian » Sat Dec 08, 2007 1:53 am

How about mixing a relatively fine grade of coal together with the tar, it would help it hold together i think, plus it would burn quite cleanly too.
What kind of tar do they use or roads? That seems to set nicely.

Edit: How about using roofing "pitch".
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Unread postAuthor: ALIHISGREAT » Sat Dec 08, 2007 2:35 am

Novacastrian wrote:How about mixing a relatively fine grade of coal together with the tar, it would help it hold together i think, plus it would burn quite cleanly too.
What kind of tar do they use or roads? That seems to set nicely.

Edit: How about using roofing "pitch".


bitumen is what they use on roads, its one of the many fractions of crude oil :) and it won't burn cleanly, it will produce either co2/co and water when burned.
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Unread postAuthor: jrrdw » Sat Dec 08, 2007 10:40 am

What region do you life in homedepotpro? The lenth in motors your thinking of will burn for quit some time. If they have suficent thrust, your never going to see you rocket again even with a well timed recovery system. The biggest/longest burning motors iv'e herd of are G-100's, power level being G, burn time being 100 seconds. Really only useable in desert area's of the south western united states. Visabilty reasoning, no humidity gives allmost unlimited visabilty. Here in the north east, I can loose a rocket with a D-11-5, 5 being the delay for parachute ejection charge to deploy recovery system/parachute.
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Unread postAuthor: homedepotpro » Sat Dec 08, 2007 2:57 pm

I realize a 2'' motor may be a bit too ambitious but it don't intend to shoot it up. It is more of a science experiment for my physics class. I will most likely end up making a 1.5'' motor
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Unread postAuthor: Tom » Sun Dec 09, 2007 4:53 am

Maybe this is a helpful link to yout project, the oxidiser gas they use is to expensive in my country :evil: . Maybe this link will be usefull
http://www.youtube.com/watch?v=hw2uGaImSA8
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Unread postAuthor: jrrdw » Sun Dec 09, 2007 7:34 am

Tom wrote:Maybe this is a helpful link to yout project, the oxidiser gas they use is to expensive in my country :evil: . Maybe this link will be usefull
http://www.youtube.com/watch?v=hw2uGaImSA8
Tom


Warning: Dail-up users, this video clip is 7+ minutes long. My browser is still running slow!
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Unread postAuthor: Spitfire » Sun Dec 09, 2007 7:48 am

Mix Saltpeter and sugar on a 1:1 ratio. Then heat it till it melts, then pour it into where you want and let it set. Burns nicely, and makes smoke for traceing the rocket. Hope it helps
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Unread postAuthor: CpTn_lAw » Sun Dec 09, 2007 7:59 am

MMMh.....interesting, but i've learnt one thing from hybrid rocket engines, you need an important reducer. The smaller du nozzle, the higher the exhaust velocity. you also need to use gal. steel pipe lol, otherwise it wil last a few seconds
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Unread postAuthor: jrrdw » Sun Dec 09, 2007 8:20 am

CpTn_lAw wrote:MMMh.....interesting, but i've learnt one thing from hybrid rocket engines, you need an important reducer. The smaller du nozzle, the higher the exhaust velocity. you also need to use gal. steel pipe lol, otherwise it wil last a few seconds


True, but you have to be mindfull of to much back pressure, to much and....well....KABOOM! Not enough and a no to low power problem will accure. The proper nozzle has to be used for desired results.
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