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= WTF? =
 
= WTF? =
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[[Image:Hybrids big.png|thumb|Hybrid rocket propulsion system conceptual overview]]
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[[Image:Hybrids big.png|thumb|left|Hybrid rocket propulsion system conceptual overview]]
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Nomen est omen. [http://en.wikipedia.org/wiki/Salami Salami] rocket is about building a [http://en.wikipedia.org/wiki/Hybrid_rocket hybrid rocket] with a gaseous [http://en.wikipedia.org/wiki/Oxidizing_agent oxydizer] and salami as propellants.
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Nomen est omen. [http://en.wikipedia.org/wiki/Salami Salami] rocket is about building a [http://en.wikipedia.org/wiki/Hybrid_rocket hybrid rocket] with a gaseous [http://en.wikipedia.org/wiki/Oxidizing_agent oxydizer] (N<sub>2</sub>0) and salami as propellants.
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= Oxydizer =
 
= Oxydizer =
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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 chose [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.
 +
Since the alternatives i found are quite expensive, i use the nitrous oxyde of [http://en.wikipedia.org/wiki/Whipped-cream_charger whipped-cream chargers].
  
 
= Fuel =
 
= Fuel =
Zeile 10: Zeile 16:
  
 
= Simulation =
 
= Simulation =
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Im using RockSim to simulate the flight stability of the rocket. The behaviour of the N<sub>2</sub>0/Salami hybrid motor is simulated by an external model programmed in C++.
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Im using [http://www.apogeerockets.com/RockSim.asp RockSim] to simulate the flight stability of the rocket. The behaviour of the N<sub>2</sub>0/ hybrid motor is simulated by an external model programmed in C++.
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= Parts =
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[[Bild:Scaled-dscn9121.jpg|thumb|Overview of the rocket parts]]
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All parts directly participating in the combustion would have to sustain at least 51 bar<br>(vapor pressure of N<sub>2</sub>0 at 20°C) but for reasons of safety i assume 200bar as the minimum.
  
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= Draft =
 
 
* [http://en.wikipedia.org/wiki/Pressure_vessel Run Tank]: A light-weight container for the oxydizer capable of sustaining enough pressure
 
* [http://en.wikipedia.org/wiki/Pressure_vessel Run Tank]: A light-weight container for the oxydizer capable of sustaining enough pressure
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* On/Off [http://en.wikipedia.org/wiki/Valve Valve]: Enables/Disables oxydizer flow.
 
 
* Throttle Valve: A valve to allow precise regulation of the oxydizer flow from the run tank to the [http://en.wikipedia.org/wiki/Combustion_chamber combustion chamber].
 
* Throttle Valve: A valve to allow precise regulation of the oxydizer flow from the run tank to the [http://en.wikipedia.org/wiki/Combustion_chamber combustion chamber].
 
* [http://en.wikipedia.org/wiki/Injector Injector]: Aids in vaporizing the (still) liquid oxydizery.  
 
* [http://en.wikipedia.org/wiki/Injector Injector]: Aids in vaporizing the (still) liquid oxydizery.  
Zeile 20: Zeile 28:
 
* [http://en.wikipedia.org/wiki/Nozzle Nozzle]: An opening that dramatically accelerates the hot gas escaping the combustion chamber.
 
* [http://en.wikipedia.org/wiki/Nozzle Nozzle]: An opening that dramatically accelerates the hot gas escaping the combustion chamber.
 
* Ignitor: Preheating the fuel and initializing combustion.
 
* Ignitor: Preheating the fuel and initializing combustion.
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* Shell: Protecting the motor
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* Body tube: Enhances airodynamic properties of the rocket and encapsulates the motor.
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* Recovery System ([http://en.wikipedia.org/wiki/Parachute parachute]): Enables slow decent after burn-out for safety and reusability
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* Motor mount: Anchors the motor within the body tube
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* [http://en.wikipedia.org/wiki/Fins Fins]: Enhances airodynamic/stability properties of the rocket.
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* [http://en.wikipedia.org/wiki/Model_rocket#Model_rocket_recovery_methods Recovery System]: Enables slow decent after burn-out for safety and reusability
 
* Tail camera: It's all about the nice view
 
* Tail camera: It's all about the nice view
 
* [http://en.wikipedia.org/wiki/Altimeter Altimeter]: Measurement concludes the fate of the [http://en.wikipedia.org/wiki/Schr%C3%B6dinger%27s_cat#Copenhagen_interpretation cat]
 
* [http://en.wikipedia.org/wiki/Altimeter Altimeter]: Measurement concludes the fate of the [http://en.wikipedia.org/wiki/Schr%C3%B6dinger%27s_cat#Copenhagen_interpretation cat]
 
* [http://en.wikipedia.org/wiki/Electric_beacon Electric beacon]: Transmits a signal to ease finding the landing site.
 
* [http://en.wikipedia.org/wiki/Electric_beacon Electric beacon]: Transmits a signal to ease finding the landing site.
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* Filling system: Pipework to fill the run tank with nitrous oxyde from whipped cream chargers.
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= Shopping list =
 
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All parts directly participating in the combustion would have to sustain at least 51 bar (vapor pressure of N<sub>2</sub>0 at 20°C) but for reasons of safety i assume 100bar as the minimum.
 
  
 
== Run Tank ==
 
== Run Tank ==
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[[Bild:Run tank.jpg|thumb|left|Run tank]]
 
[http://www.paintball-discounters.com/get_item_130017_co2-tank-aluminum-20-oz-with-on-off-valve.htm Smart Parts C02 aluminium tank] for paintball guns with on/off valve.
 
[http://www.paintball-discounters.com/get_item_130017_co2-tank-aluminum-20-oz-with-on-off-valve.htm Smart Parts C02 aluminium tank] for paintball guns with on/off valve.
 
* Capacity: 591ml (20 oz)
 
* Capacity: 591ml (20 oz)
 
* Connector: 1,27cm (1/2")
 
* Connector: 1,27cm (1/2")
 
* Max Pressure: 200bar
 
* Max Pressure: 200bar
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* Price: 45€
 
  
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== On/Off Valve ==
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No separate valve needed since the proposed CO2 tank has it built-in.
 
  
 
== Throttle valve ==
 
== Throttle valve ==
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An adjustable throttle valve ([https://ecom2.stasto.com/oc/oc_hierarchy/index.asp?prodid=245-4&articleid=65116&param=1-1-1-0-OE Stasto VRB-030]) intended for use in hydraulics.
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[[Bild:Scaled-dscn9104.jpg|left|thumb|Throttle valve]]
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An adjustable throttle valve ([http://www.zoebl.co.at/produkte/drosselventile.html]) intended for use in hydraulics.
 
* Connector: 1,27cm (1/2")
 
* Connector: 1,27cm (1/2")
 
* Flow rate: 45 l/min
 
* Flow rate: 45 l/min
 
* Working pressure: 350 bar
 
* Working pressure: 350 bar
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* Price: 30€
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== Injector ==
 
== Injector ==
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Probably custom made or this one -> [http://www.rocketstore.co.uk/shop/product.asp?numRecordPosition=13&P_ID=1013&strPageHistory=man&strKeywords=&SearchFor=&PT_ID=0 SKR-54UC]
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[[Bild:Injector.jpg|left|thumb|100px|Injector]]
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[http://www.rocketstore.co.uk/shop/product.asp?numRecordPosition=13&P_ID=1013&strPageHistory=man&strKeywords=&SearchFor=&PT_ID=0 SKR-54UC]
 
* Diameter: 54mm
 
* Diameter: 54mm
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* Price: 53 €
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== Combustion Chamber ==
 
== Combustion Chamber ==
 +
[[Bild:Combustion chamber.jpg|left|thumb|Combustion chamber]]
 
[http://www.paintball-discounters.com/get_item_130017_co2-tank-aluminum-20-oz-with-on-off-valve.htm C02 aluminium tank] for paintball guns without on/off valve.
 
[http://www.paintball-discounters.com/get_item_130017_co2-tank-aluminum-20-oz-with-on-off-valve.htm C02 aluminium tank] for paintball guns without on/off valve.
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* Capacity: 591ml (20 oz)
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* Capacity: 255ml (9 oz)
 
* Connector: 1,27cm (1/2")
 
* Connector: 1,27cm (1/2")
 
* Max Pressure: 200bar
 
* Max Pressure: 200bar
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* Price: 14€
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== Nozzle ==
 
== Nozzle ==
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[[Bild:Nozzle.jpg|left|thumb|100px|Nozzle]]
 
[http://www.rocketstore.co.uk/shop/product.asp?numRecordPosition=17&P_ID=1012&strPageHistory=man&strKeywords=&SearchFor=&PT_ID=0 SKR-54NZL] graphite nozzle
 
[http://www.rocketstore.co.uk/shop/product.asp?numRecordPosition=17&P_ID=1012&strPageHistory=man&strKeywords=&SearchFor=&PT_ID=0 SKR-54NZL] graphite nozzle
 
* Diameter: 54mm
 
* Diameter: 54mm
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* Price: €35
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== Ignitor ==  
 
== Ignitor ==  
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None selected yet.
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The ignitor charge consists of black powder and paraffin wax wrapped in thin papper. It is triggered by an [http://en.wikipedia.org/wiki/Arduino arduino] which is remotely controlled.
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== Body tube ==
 +
[[Bild:Body tube.jpg|left|thumb|100px|Body tube]]
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Cardboard tube, intended for postal delivery.
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* Dimension: 1000 x 140 x 3 mm
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== Motor mount & Fins ==
 +
[[Bild:Motor mount and fins.jpg|left|thumb|100px|Motor mount and fins]]
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Wooden centering rings and perspex fins, precisely milled with a CNC machine.
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== Shell ==
 
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A nice design proposal by [[User:mactux|mactux]]. Exact specifications & blue prints yet to be made.
 
  
 
== Recover System ==
 
== Recover System ==
 
None specified/selected yet.
 
None specified/selected yet.
  
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== Filling System ==
 +
[[Bild:Filling device.jpg|left|thumb|100px|Filling device]]
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A slightly modified CO<sub>2</sub> charging device for paintball guns.
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= Testing =
 +
After a few backyard tests with a rather improvised device, we tested the actual motor at [http://metalab.at/wiki/Stadtflucht2 Lindabrunn]. Special thanks to [[User:Kyrah|kyrah]] and [[User:MariusKintel|marius]] for support, pyromantic inspiration and fuel sponsoring.
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== Videos ==
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* [http://www.youtube.com/watch?v=947LucSeeLQ Bazooka]
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* [http://www.youtube.com/watch?v=z7lsm5o20LY Bazooka - alternate version]
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* [http://www.youtube.com/watch?v=M-OZr2rxLkA Smoked Salami]
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* [http://www.youtube.com/watch?v=jjUOp_KC-34 Almost Burning]
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* [http://www.youtube.com/watch?v=MuqjGUcI99Y Almost Burning - alternate version]
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* [http://www.youtube.com/watch?v=qxXtl7s4o_0 Burn!]
  
 
= Links =
 
= Links =
Zeile 78: Zeile 156:
 
* [http://www.nakka-rocketry.net/ Very helpful articles of Richard Nakka about his experimental rockets]
 
* [http://www.nakka-rocketry.net/ Very helpful articles of Richard Nakka about his experimental rockets]
 
* [http://www.modellraketen.info/knowhow.html Rocketry know-how DB (DE)]
 
* [http://www.modellraketen.info/knowhow.html Rocketry know-how DB (DE)]
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* [http://64.41.64.113/home/tips.html Model Rocketry Tips]
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* [http://www.pcprg.com/rocketre.htm Building a Model Rocket Parachute Recovery System by Dr. Jean Potvin]
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* [http://www.grc.nasa.gov/WWW/K-12/airplane/rktthsum.html Nasa: Rocket thrust Equations]
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[[Kategorie:Projekte]]

Aktuelle Version vom 30. Juni 2011, 17:08 Uhr

WTF?

Hybrid rocket propulsion system conceptual overview

Nomen est omen. Salami rocket is about building a hybrid rocket with a gaseous oxydizer (N20) and salami as propellants.




Oxydizer

I chose 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. Since the alternatives i found are quite expensive, i use the nitrous oxyde of whipped-cream chargers.

Fuel

Salami: High efficency hydrocarbon based fuel ;)

Simulation

Im using RockSim to simulate the flight stability of the rocket. The behaviour of the N20/ hybrid motor is simulated by an external model programmed in C++.

Parts

Overview of the rocket parts

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 200bar as the minimum.

  • Run Tank: A light-weight container for the oxydizer capable of sustaining enough pressure
  • 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.
  • Body tube: Enhances airodynamic properties of the rocket and encapsulates the motor.
  • Motor mount: Anchors the motor within the body tube
  • Fins: Enhances airodynamic/stability properties of the rocket.
  • Recovery System: 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.
  • Filling system: Pipework to fill the run tank with nitrous oxyde from whipped cream chargers.

Run Tank

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


Throttle valve

Throttle valve

An adjustable throttle valve ([1]) intended for use in hydraulics.

  • Connector: 1,27cm (1/2")
  • Flow rate: 45 l/min
  • Working pressure: 350 bar





Injector

Injector

SKR-54UC

  • Diameter: 54mm






Combustion Chamber

Combustion chamber

C02 aluminium tank for paintball guns without on/off valve.

  • Capacity: 255ml (9 oz)
  • Connector: 1,27cm (1/2")
  • Max Pressure: 200bar


Nozzle

Nozzle

SKR-54NZL graphite nozzle

  • Diameter: 54mm





Ignitor

The ignitor charge consists of black powder and paraffin wax wrapped in thin papper. It is triggered by an arduino which is remotely controlled.

Body tube

Body tube

Cardboard tube, intended for postal delivery.

  • Dimension: 1000 x 140 x 3 mm






Motor mount & Fins

Motor mount and fins

Wooden centering rings and perspex fins, precisely milled with a CNC machine.






Recover System

None specified/selected yet.


Filling System

Filling device

A slightly modified CO2 charging device for paintball guns.





Testing

After a few backyard tests with a rather improvised device, we tested the actual motor at Lindabrunn. Special thanks to kyrah and marius for support, pyromantic inspiration and fuel sponsoring.

Videos

Links

Abgerufen von „https://metalab.at/wiki/index.php?title=Salami_Rocket&oldid=37917“