Salami Rocket: Unterschied zwischen den Versionen
Amir (Diskussion | Beiträge) (→WTF?) |
Amir (Diskussion | Beiträge) |
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= Oxydizer = | = Oxydizer = | ||
I'd prefer [http://en.wikipedia.org/wiki/N2O N<sub>2</sub>O] over [http://en.wikipedia.org/wiki/Oxygen O<sub>2</sub>] because although N<sub>2</sub>O carries a lot of conjectural inert nitrogen (64%) oxygen is much harder to handle (tank filling, storage & injection). Additionally the [http://en.wikipedia.org/wiki/Nitrogen nitrogen], though not participating in combustion, raises the fuel erosion rate and cooles the nozzle enough to reuse it many times. | I'd prefer [http://en.wikipedia.org/wiki/N2O N<sub>2</sub>O] over [http://en.wikipedia.org/wiki/Oxygen O<sub>2</sub>] because although N<sub>2</sub>O carries a lot of conjectural inert nitrogen (64%) oxygen is much harder to handle (tank filling, storage & injection). Additionally the [http://en.wikipedia.org/wiki/Nitrogen nitrogen], though not participating in combustion, raises the fuel erosion rate and cooles the nozzle enough to reuse it many times. | ||
Most likely, since the alternatives i found are quite expensive, i will use the nitrous oxyde of [http://en.wikipedia.org/wiki/Whipped-cream_charger whipped-cream chargers]. By the way, never search for [http://www.google.at/search?q=sahnespender&ie=utf-8&oe=utf-8&aq=t&rls=com.ubuntu:en-US:unofficial&client=firefox-a "Sahnespender"] at google. | |||
= Fuel = | = Fuel = | ||
Version vom 19. Juni 2009, 06:04 Uhr
WTF?
Nomen est omen. Salami rocket is about building a hybrid rocket with a gaseous oxydizer and salami as propellants.
Oxydizer
I'd prefer N2O over O2 because although N2O carries a lot of conjectural inert nitrogen (64%) oxygen is much harder to handle (tank filling, storage & injection). Additionally the nitrogen, though not participating in combustion, raises the fuel erosion rate and cooles the nozzle enough to reuse it many times. Most likely, since the alternatives i found are quite expensive, i will use the nitrous oxyde of whipped-cream chargers. By the way, never search for "Sahnespender" at google.
Fuel
Salami: High efficency hydrocarbon based fuel ;)
Simulation
Im using RockSim to simulate the flight stability of the rocket. The behaviour of the N20/Salami hybrid motor is simulated by an external model programmed in C++.
Draft
- Run Tank: A light-weight container for the oxydizer capable of sustaining enough pressure
- On/Off Valve: Enables/Disables oxydizer flow.
- Throttle Valve: A valve to allow precise regulation of the oxydizer flow from the run tank to the combustion chamber.
- Injector: Aids in vaporizing the (still) liquid oxydizery.
- Combustion Chamber: Where the oxydizer/fuel mix burns. Additionally to pressure (same amount as for the run tank) it has to sustain heat.
- Nozzle: An opening that dramatically accelerates the hot gas escaping the combustion chamber.
- Ignitor: Preheating the fuel and initializing combustion.
- Shell: Protecting the motor
- Recovery System (parachute): Enables slow decent after burn-out for safety and reusability
- Tail camera: It's all about the nice view
- Altimeter: Measurement concludes the fate of the cat
- Electric beacon: Transmits a signal to ease finding the landing site.
Shopping list
All parts directly participating in the combustion would have to sustain at least 51 bar (vapor pressure of N20 at 20°C) but for reasons of safety i assume 100bar as the minimum.
Run Tank
Smart Parts C02 aluminium tank for paintball guns with on/off valve.
- Capacity: 591ml (20 oz)
- Connector: 1,27cm (1/2")
- Max Pressure: 200bar
- Price: 45€
On/Off Valve
No separate valve needed since the proposed CO2 tank has it built-in.
Throttle valve
An adjustable throttle valve (Stasto VRB-030) intended for use in hydraulics.
- Connector: 1,27cm (1/2")
- Flow rate: 45 l/min
- Working pressure: 350 bar
- Price: 30€
Injector
Probably custom made or this one -> SKR-54UC
- Diameter: 54mm
- Price: 53 €
Combustion Chamber
C02 aluminium tank for paintball guns without on/off valve.
- Capacity: 591ml (20 oz)
- Connector: 1,27cm (1/2")
- Max Pressure: 200bar
- Price: 14€
Nozzle
SKR-54NZL graphite nozzle
- Diameter: 54mm
- Price: €35
Ignitor
None selected yet.
Shell
A nice design proposal by mactux. Exact specifications & blue prints yet to be made.
Recover System
None specified/selected yet.
