@@ -22,7 +21,7 @@ Model rocket flights can be divided into different flight states [[1](https://op
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@@ -22,7 +21,7 @@ Model rocket flights can be divided into different flight states [[1](https://op
3. Coasting
3. Coasting
4. Recovery
4. Recovery
For the Ariane 6 Model rocket the cargo bay shall be redesigned so that it can hold miniature satellites. The goal is to deploy the satellite at a predefined height between phases 3 and 4 and let it be recovered with its own parachute or gliding system. The rocket will then deploy its own parachute and will be recovered separately.
For the Ariane 6 Model rocket the cargo bay shall be redesigned so that it can hold miniature satellites. The goal is to deploy the satellite at a predefined height between phases 3 and 4 and let it be recovered with its own parachute or gliding system. The rocket will then deploy its own parachute and will be recovered separately.
## Project Tasks
## Project Tasks
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@@ -53,6 +52,137 @@ Ideally this will be done in a group of 3 students
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@@ -53,6 +52,137 @@ Ideally this will be done in a group of 3 students
## Mechanical Design (@istphklin)
## Mechanical Design (@istphklin)
### Requirements:
**Dimensions and Weight**
The fairing should keep its original proportions and diamater to still fit into the Ariane 6 Rocket. It should also stay below a certain weight limit where the flight of the rocket would still be stable.
**Opening Mechanism for the Fairing**
The fairing or cargo section should be able to open or detach itself from the rest of the assembly to be able to release the satelite.
**Release Mechanism for the Satelite**
The satelite should be deployed around apogee by our electronics.
**Space for Electronics**
Besides the satelite there should be enought space to hold all electronics, power delivery, cables and motors without getting tangled up with the payload during the flight or release.
**Recovery System**
The satelite aswell as the fairing and cargo section should be recovered with the main rocket parachute or on its own with a seperate parachute.
A spring would push the payload into pins on the top of the fairing locking it down, realeasing the spring would open the fairing and release the satelite.
Through the design process we have created many prototypes.
From left to right:
1. Original Fairing Design.
2. First try at a two fairing design.
3. Changes to the aerodynamics of the fairing and how the two halves connect.
4. Added storage inside the fairings for containing the satelite, first new cargo section design with removable bottom. Clamps for mounting the motors to the inside of the cargo section.
5. Final design, added stronger hinges to reduce instability during opening and closing, improved removable bottom to fit easier. Added locking pins to the top of the fairings.
The upper part of the cargo section would contain two linear servo motors which would open/close the fairings. They would be connected to the bottom of the fairings with little push rods. The electronics would be contained in the bottom part. With easy access due to the removable bottom, where the main rocket parachute would be attached.
Our placeholder satelite was a small ball that we could add weight to with coins and small attachements for a parachute.
### Manufacturing and Assembly
The parts where all designed in CAD based of the original models and then 3D printed. Many of the parts had to be filed down to properly fit due to the small size and tolerances.
**Assembly**
1. Push the two servo motors into the clamps inside the cargo section.
2. Put the farings into the hinges and push the connector pin through.
3. Attach the push rods to the underside of the fairings and to the servo motors.
4. Connect the servos with the PCB and put on the bottom part of the cargo section.
### Testing
For testing we used our software to trigger the motors to open and close the fairings. Aswell as a simulation software to check if the flight would be stable with our added weight. launch day ergebnis
### Launch Day Results
Even though one of the servos didnt work reliably and the locking pins for the fairing where not strong enought due to the packed up satalite parachute acting like a spring against the inside of the fairings. The satelite deployed successfully shortly after reaching apogee and accended on its parachute.
### Conclusion
**Evaluation of the Design**
The design worked as inteded but still has issues with reliablity and can be quite difficult to assemble.
**Improvements for the Future**
Use better and more reliable motors. Improve the opening angle and the locking pins of the fairings. A bigger storage for the satelite could be achieved by reducing the size of the cargo section which was mostly empty.
