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Questions tagged [hybrid-rocket]

Rocket engines which consist of a solid propellant and a liquid or gaseous oxidizer.

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Does NASA still plan for the Mars Ascent Vehicle to burn wax from the surface to orbit?

The NASA news item From Pedicures to the Peregrine Rocket, Paraffin Wax Proves Its Worth says: The paraffin-based fuel also works under challenging environmental conditions, like the very low ...
2
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1answer
93 views

How do you avoid wasting oxidizer when designing a hybrid rocket?

I was thinking of designing a very simple and small Paraffin rocket engine as an experiment. One thing that I don't understand about these designs is how you efficiently use your oxidizer without a ...
5
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1answer
454 views

Why did Virgin Galactic switch back to HTPB after one launch using thermoplastic polyamide (i.e. nylon)?

A subsection of Second-generation engine in Wikipedia's article on RocketMotorTwo says: New fuel formulation Rather than use rubber-based HTPB in the solid portion of the hybrid rocket motor—...
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Could Sodium metal be used in rocket fuel?

For instance, I read that the Hercules X-265 rocket motor used in the Sprint missile was a solid double base propellant that used nitrocellulose with zirconium metal staples and nitroglycerin as a ...
7
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Why NASA's sudden (apparently) interest in Wax hybrid engines? Which property is so attractive now?

I've just read the NASA news item From Pedicures to the Peregrine Rocket, Paraffin Wax Proves Its Worth. The project started when researchers at Stanford discovered that paraffin fuel burns three ...
4
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2answers
382 views

What properties define a good solid propellant for a hybrid engine? (e.g. why not use wood?)

This comment got me thinking... Pure oxygen from a tank of LOX can allow a wide variety of materials to be used as a convenient if not always optimal rocket propellant; things like parafin and sugar ...
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1answer
250 views

Could you use Helium as an oxidizer? [closed]

I am trying to create an HRE (Hybrid Rocket Engine) and i am trying to find the best oxidizer. Do any of you have experience with using helium?
1
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1answer
89 views

Hybrid / solid rocket engines with large carbon content

Why solid rocket boosters or hybrid engines are favored towards larger hydrogen content, not carbon (C+LOX, C+NO2, C+N2H4O3)? Is there any known data on Isp and issues of such combinations (both ...
6
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1answer
248 views

How to prevent melting too much paraffin in a hybrid LOX-paraffin rocket?

In a hybrid LOX rocket, only the flow of LOX may be controlled. The amount of paraffin melted by heat is determined by the very complex heat transfer from gas to solid paraffin. If the mixture of ...
3
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1answer
611 views

Isp of LOX-based hybrid rocket engines

Can anyone help to find data or book on Isp for hybrid rocket engines using LOX as oxidizer? I am interested to know Isp for LOX combinations with carbon, Al+HTPB, parafin, sugar and others.
3
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0answers
92 views

Can a DIY rocket put an object into a stable orbit around earth? [duplicate]

Is it possible for a "home made" rocket to launch an object into a stable orbit assuming a person has calculated the right trajectory?
2
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0answers
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Are there any complications of the position of the oxidizer injector on Orbitec's vortex rocket engine?

Orbitec's vortex rocket engine injects oxidizer from near the nozzle up the wall of the engine chamber in a vortex. The oxidizer injector being in this position seems unusual. Are there any ...
12
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1answer
1k views

Whipped cream hybrid rocket

I am currently working on a small hybrid rocket as a summer project. I've decided on using nitrous oxide as the oxidizer, but large tanks are expensive and I don't have a lot of money (I'm in high ...
6
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1answer
123 views

Is pogo oscillation a risk in hybrid motors?

Is pogo oscillation accounted for in design of hybrid motors? I'm thinking particularly about hybrids that use Nitrous Oxide as the oxidizer because the weird triple point effects that one experiences ...
20
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3answers
1k views

Challenges Facing Hybrid Rocketry

The concept of hybrid rocketry is very interesting, and seems like it has many advantages over its solid and liquid forebears. But having only a superficial idea of the challenges preventing it from ...