Salami Rocket: Unterschied zwischen den Versionen
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| (13 dazwischenliegende Versionen desselben Benutzers werden nicht angezeigt) | |||
| Zeile 1: | Zeile 1: | ||
= WTF? = | = WTF? = | ||
[[Image:Hybrids big.png|thumb|Hybrid rocket propulsion system conceptual overview]] | [[Image:Hybrids big.png|thumb|left|Hybrid rocket propulsion system conceptual overview]] | ||
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. | 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. | ||
= Oxydizer = | = Oxydizer = | ||
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. | 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] | 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 15: | Zeile 20: | ||
= Parts = | = Parts = | ||
[[Bild:Scaled-dscn9121.jpg|thumb|Overview of the rocket parts]] | [[Bild:Scaled-dscn9121.jpg|thumb|Overview of the rocket parts]] | ||
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 200bar as the minimum. | 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. | ||
* [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 | ||
| Zeile 25: | Zeile 30: | ||
* Body tube: Enhances airodynamic properties of the rocket and encapsulates the motor. | * Body tube: Enhances airodynamic properties of the rocket and encapsulates the motor. | ||
* Motor mount: Anchors the motor within the body tube | * Motor mount: Anchors the motor within the body tube | ||
* Fins: Enhances airodynamic/stability properties of the rocket. | * [http://en.wikipedia.org/wiki/Fins Fins]: Enhances airodynamic/stability properties of the rocket. | ||
* | * [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] | ||
| Zeile 33: | Zeile 38: | ||
== Run Tank == | == Run Tank == | ||
[[Bild:Run tank.jpg|thumb|Run tank]] | [[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 | ||
== Throttle valve == | == Throttle valve == | ||
[[Bild:Scaled-dscn9104.jpg|thumb|Throttle valve]] | [[Bild:Scaled-dscn9104.jpg|left|thumb|Throttle valve]] | ||
An adjustable throttle valve ([http://www.zoebl.co.at/produkte/drosselventile.html]) intended for use in hydraulics. | 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 | ||
| Zeile 50: | Zeile 61: | ||
== Injector == | == Injector == | ||
[[Bild:Injector.jpg|thumb|100px|Injector]] | [[Bild:Injector.jpg|left|thumb|100px|Injector]] | ||
[http://www.rocketstore.co.uk/shop/product.asp?numRecordPosition=13&P_ID=1013&strPageHistory=man&strKeywords=&SearchFor=&PT_ID=0 SKR-54UC] | [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 | ||
| Zeile 60: | Zeile 75: | ||
== Combustion Chamber == | == Combustion Chamber == | ||
[[Bild:Combustion chamber.jpg|thumb|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. | ||
* Capacity: 255ml (9 oz) | * Capacity: 255ml (9 oz) | ||
* Connector: 1,27cm (1/2") | * Connector: 1,27cm (1/2") | ||
* Max Pressure: 200bar | * Max Pressure: 200bar | ||
== Nozzle == | == Nozzle == | ||
[[Bild:Nozzle.jpg|thumb|100px|Nozzle]] | [[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 | ||
| Zeile 77: | Zeile 95: | ||
== Ignitor == | == Ignitor == | ||
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. | |||
== Body tube == | == Body tube == | ||
[[Bild:Body tube.jpg|thumb|100px|Body tube]] | [[Bild:Body tube.jpg|left|thumb|100px|Body tube]] | ||
Cardboard tube, intended for postal delivery. | Cardboard tube, intended for postal delivery. | ||
* Dimension: 1000 x 140 x 3 mm | * Dimension: 1000 x 140 x 3 mm | ||
| Zeile 92: | Zeile 113: | ||
== Motor mount & Fins == | == Motor mount & Fins == | ||
[[Bild:Motor mount and fins.jpg|thumb|100px|Motor mount and fins]] | [[Bild:Motor mount and fins.jpg|left|thumb|100px|Motor mount and fins]] | ||
Wooden centering rings and perspex fins, precisely milled with a CNC machine. | Wooden centering rings and perspex fins, precisely milled with a CNC machine. | ||
| Zeile 102: | Zeile 127: | ||
== Recover System == | == Recover System == | ||
None specified/selected yet. | None specified/selected yet. | ||
== Filling System == | |||
[[Bild:Filling device.jpg|left|thumb|100px|Filling device]] | |||
A slightly modified CO<sub>2</sub> charging device for paintball guns. | |||
= Testing = | = 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. | 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. | ||
== Videos == | |||
* [http://www.youtube.com/watch?v=947LucSeeLQ Bazooka] | * [http://www.youtube.com/watch?v=947LucSeeLQ Bazooka] | ||
* [http://www.youtube.com/watch?v=z7lsm5o20LY Bazooka - alternate version] | * [http://www.youtube.com/watch?v=z7lsm5o20LY Bazooka - alternate version] | ||
Aktuelle Version vom 30. Juni 2011, 17:08 Uhr
WTF?
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
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
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
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
- Diameter: 54mm
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
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
Cardboard tube, intended for postal delivery.
- Dimension: 1000 x 140 x 3 mm
Motor mount & Fins
Wooden centering rings and perspex fins, precisely milled with a CNC machine.
Recover System
None specified/selected yet.
Filling System
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
- Bazooka
- Bazooka - alternate version
- Smoked Salami
- Almost Burning
- Almost Burning - alternate version
- Burn!
Links
- Basic concept of hybrid rockets at wikipedia
- Excellent tech papers on calculating, planing and building hybrid rockets
- Very helpful articles of Richard Nakka about his experimental rockets
- Rocketry know-how DB (DE)
- Model Rocketry Tips
- Building a Model Rocket Parachute Recovery System by Dr. Jean Potvin
- Nasa: Rocket thrust Equations
