Technical Details

Aether Cut Out

Aether System Overview

The rocket consists of the following subsystems:

AetherCoupler

Modular coupler interfaces

  1. Nosecone Section (incl. flight computer)
  2. Active Stabilization Section
  3. Recovery Section (i.e. mortar+parachute)
  4. Instrumentation Section (i.e. Inertial Measurement Unit + Sun Sensor)
  5. Propulsion Section (shell structure)
  6. Engine Section (DXS Asimov)

All sections are connected via a modular coupler system, which allows for water tight sealing and easy assembling during the launch campaign.

 Nose Cone Section: Flight ComputerGeneric Modular Flight Electronics

The nose cone of the Aether launcher houses the brain of the rocket, namely the flight computer, which is designed by the Electronics Team and ACT, and is based on the DARE General Flight Electronics.

The flight computer is designed such that it is compatible with ACT-specific components, such as the MTi-100 Inertial Measurement Unit (IMU) sponsored by XSENS.

The Aether Flight Electronics consists of the following items:

  1. Battery Pack
  2. Power supply board
  3. Main processor board, incl ACT software
  4. Actuation board for actuators
  5. Sensor board
  6. Telemetry board

 

Active Stabilization Section

After having successfully tested the Stability Augmentation System of the CanSat V7S developed by the Advanced Control Team, the team is upscaling the canard system for supersonic speeds. Project Aether is the first DARE rocket which features supersonic active stabilization.

The canard system is mechanically limited to do roll-stabilization only, because the ACT still needs to test full-control on a small scale. Via an integrated gearing system, the canards will always rotate into the same direction, which improves the safety of this system.

The Aerodynamics department within the ACT is performing dedicated Computational Fluid Dynamics (CFD) simulations, to study the flow of the canards in supersonic speeds and to optimize the design.

Aether Active Stabilization Section Cut Out

Aether Active Stabilization Section Cut Out

Aether Canard Pressure Distribution

Aether Canard Pressure Distribution

 

Recovery Section

The recovery system is a concepts that aims to solve difficulties present in the

Stratos II+ recovery system. It uses a drogue parachute deployed by mortar, which gives it a wider design envelope than the system used for Stratos II+. In addition, it solves much of the multibody dynamics, which are notoriously difficult.

The drogue chute will be deployed at high velocities, and is connected to the bottom of the rocket in such a manner, that it will turn the rocket into a flat spin. By doing so, the rockets’ velocity will decrease even more, and results in a stable descent.

AetherChute

Aether parachute deployment concept

 

AetherMortar

Mortar deployment system

 

Instrumentation Section

The Instrumentation Section houses the main sensor of the Aether control system, the XSENS Inertial Measurement Unit (IMU). This sensor is able to measure the attitude of the rocket during flight, which is an input for the flight control algorithms to actuate the canards. The location of the IMU is at the Instrumentation Section, such that it is closer to the center of gravity of the rocket.

A second sensor which is placed in the Instrumentation Section is the LENS BiSon64 Sun Sensor. The team is investigating if this sensor can be used to determine the attitude of the rocket for the control algorithms.

Additional components which will be installed in this section are cameras, and a data connection cable to monitor the entire state of the rocket during count down.

XSENS Mti-100 IMU

XSENS Mti-100 IMU

Concept design for Instrumentation Section

Instrumentation Section

LENS Bison 64 SunSensor

LENS Bison 64 SunSensor

 

Propulsion Section

Concept for Propulsion Section

Propulsion Section

The propulsion section is the casing around the engine, which includes attachments for the bottom fins. This part of the rocket will be made completely out of composites, which makes it the first large rocket within DARE which extensively uses composite materials.

The Capsule & Recovery Team is investigating techniques to make the propulsion section completely out of composite material including the fins, which brings challenges when it comes to attaching composite fins to composite tube. Cleaver methods such as using local integrated aluminum reinforcement rings are considered as a feasible solution to guarantee a solid connection between the fins and tube, to cope with the aerodynamic loads acting on the fins.

The propulsion section allows to easily slide the DXS-Asimov solid engine into it, which facilitates the assembling process during the launch campaign. Via the modular connection interfaces, the top part of the rocket is attached to the propulsion section.

Engine Section

To ensure that Aether will lift-off and reaches supersonic velocity, the rocket is powered by the biggest solid rocket motor ever developed by DARE: the DXS-Asimov. The DXS-Asimov is derived from the Leonidas 5 engine, the previous large engine of the Solid Propulsion Team. To ensure that the engine meets its theoretical performance, various single grain motor (SGM) tests and full scale motor (FSM) tests are conducted during the Aether development process.

DXS Asimov

DXS Asimov

Propellant Grain Units Value
Core diameter [mm] 80
Length [mm] 230
Outer diameter [mm] 151.5
Engine Geometry Units Value
Propellant mass [kg] 32.5
Dry mass [kg] 19.7
Length [m] 2150
Diameter [mm] 165
Performance Units Value
Isp [s] 126.3
Total impulse [Ns] 40000
Maximum thrust [N] 7714
Average thrust [N] 6464
Burn time [s] 6.24
Maximum pressure [bar] 53.7
Average pressure [bar] 45.9