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Update Propulsion 23.03.2021

Here you can see a simulation of a rocket nozzle 🚀 Even though these images are nice to look at, they contain a design flaw that we placed on purpose. Can you spot it? 🕵🏻

Update Aerodynamis 16.02.2021

Today we want to show you a simulation of our aerodynamics team. Our task is to examine the airflow along the aerodynamical parts of the rocket like the nosecone, the fins, and the air brake using CFD (Computational Fluid Dynamics). The results are to be validated in the future using a wind tunnel. 💨 This video shows the results of a CFD simulation located at the fins. Using Siemens Star-CCM+, we simulated how the air flows around the fins. The streamlines show how the air is moving along the airfoil, the colors show how the flow velocity behaves (blue = slow, red = fast). 🔵🔴 Using these results, we can determine how the rocket will behave after the engine cut-off with aerodynamical measures like the conical cover at the engine nozzle. This helps us to understand where vortices are formed and how they affect the drag of the rocket. 🌪➡️🚀

Our main activities

Have you ever wondered what the ASTG does?🕵🏻
In the picture, you can see our main tasks, ranging from 3D printing to holding weekly meetings. In order to achieve our objective of building a rocket, we have to work together and unite our passion and motivation to fulfill our goal. But we cannot do this on our own, every single one of us has an important role, which we need to carry out. Everybody is being updated on each other's work and accomplishments. This makes us a fantastic team where everybody contributes and plays a vital role in achieving our dreams.

If you want to stay tuned and learn more about what we do, visit us on Instagram @aerospaceteamgrazofficial !

Update Propulsion 16.02.2021

In the production of our fuels, the youngest manufacturing processes, such as 3D printing, meets one of the oldest: casting.

This photo shows one of the challenges in casting Paraffin-Wax. The cooling and resulting shrinkage of the material creates the voids seen in the photo. These are also called blowholes (Lunker). There are many ways to avoid these blowholes. Among other things, slower cooling, the use of additives, secondary pressing or centrifugal casting can be used. We are currently carrying out a wide range of tests to find the optimum solution for our fuels.

#technicaltuesday

Facts for Friday

Interested in rocket-engineering and space technology?
Follow us on Instagram to get a freshly prepared, space-related fact each friday!
By the way, would you know the answer to the question in the image?

#factsforfriday

Find the solution on Instagram @aerospaceteamgrazofficial

Update Recovery 02.02.2021

In this short video we would like to introduce the Ejection System for our rocket DODO, which was developed by us, the Recovery Module. Our main tasks are the separation of the rocket and the release of the two parachutes. 🪂 At first, you can see the assembly of the whole Ejection System for DODO. This mechanism opens the cartridge to release the gas in the upper part of the rocket. 🚀

At a certain overpressure, the tip of the rocket is separated from the rest and a small parachute will be released. During the descend of the rocket, this parachute is limiting the speed of the rocket falling. Near the ground, a slightly bigger parachute is released, which slows the rocket down and allows a save landing. ⬇️✅

Moreover, you can see our first ground tests with the original small parachute. We used a software to track the nose cone for a velocity estimation. The nose cone flew with a max. speed of 57,92 km/h and up to 6,5 m. ☝🏻

Update System Admin 26.01.2021

As you might know building a rocket is not only about designing and developing. For achieving our goal to participate at the spaceport america cup in 2022, we need a good system administration to handle all the background activities. Therefore, thanks for the help from @hosttech_gmbh. Now we were able to streamline our internal management and planning processes with the usage of web-based tools such as FireFly 3, LeanTime or BitWardenRS.

In the image you can see one of the tools we use, that enable us to efficiently deploy new service as demanded by the rest of the team with minimal to no downtime for the rest of the services. 🚀

#technicaltuesday

Update Structure 19.01.2021

These are the hull connectors for our first prototype rocket. Their main purpose is to align and affix the hull sections to each other and to transmit the forces of the parachute opening as well as wind loads.

The main point of focus was weight and to ensure good integration of the avionics and recovery module. We therefore settled on a frictionally locking coupling with 6 high-tensile bolts providing the needed clamping force. Keeping our weight goal in mind we added cut-outs which left us with the bare minimum material while still ensuring structural integrity. For easy access the recovery subsystem is mounted on 3 bars in front of the connector with the flight computer mounted directly inside the female coupling facing backwards. All parts will be machined from a high-strength aluminium alloy.

#technicaltuesday

Update Aerodynamics 15.12.2020

This is our new and improved airbrake-design specifically created for the dodo rocket. It now features only 3 instead of 4 sliding brakes in order to match the number of fins on the rocket, and also to fit the design into a rather small diameter of 70 mm. On top of the 3 brakes are cavities for weight reduction and increased drag when braking. The whole assembly is actuated by a high-powered servo motor for maximum actuation speed and repeatability.

For manufacturing, most parts will be machined and made from aluminum for rigidity, high strength and low weight

#technicaltuesday

Update Propulsion 08.12.2020

Hi, my name is Felix and today I share the topic of my bachelor thesis.
My bachelor thesis is about designing a Laval nozzle for our hybrid rocket engine. The requirements for the nozzle are high temperature resistant, light weight and a highly efficient expansion of the exhaust gas. To reach this target I am writing a program in python which takes over the data of the combustion and environment to compute the most efficient design. To withstand the high temperatures of the exhaust gas we are using graphite which is fairly lightweight and temperature resistant.

#technicaltuesday

Update Avionics 24.09.2020

Our Avionics Dodo Concept:

These renderings show our current concept model for the prototype rocket Dodo. We attach our flight computer, telemetry and connector PCBs on a 3D-printed mount. The mount also contains enough space for the LiPo batteries that will power our components. In order to be able to communicate with the other systems of the rocket, we use 4 circular connectors at both ends. Finally, to increase the standby time of our system we implemented a magnetic charging connector for the system, allowing us to recharge our batteries while mounted in the rocket.

#technicaltuesday