The Nuts and Bolts of B2D2
Hello everyone, in this week's blog we are going to take tour of the mechanical side of things and take a first look at what this Rocket Mounted Unit (RMU) and Free Falling Unit (FFU) actually looks like (or at least in its current state of development :) ). The one taking you on this tour is me Fredrik, one of the teams mechanical design team members. First let's take a closer look on the RMU.
What this fancy cylinder does is hold the FFU securely during the rocket launch and eject it from the rocket to start the experiment. The FFU and its protective hatch are kept in place with steel cables which on time of ejection are cut, by what are called pyro cutters. They are essentially a knife pushed by a small explosive that cuts the cable. When the cables has been cut springs push out the hatch and FFU and the experiment starts.
The FFU contains the boom to be deployed, a recovery unit, antennas and much more all which will be covered in later blog posts. Prior to the deployment of the tape spring boom, that carries the magnetometers used to measure the magnetic field. The FFU needs to be stabilized to ensure successful deployment, this is done with our reaction wheels.
With three of these small packages the orientation and spin rate of the FFU can be controlled and stabilized prior to deployment to ensure safe deployment and a successful experiment. In this reaction wheel there is a set of gears that drive a flywheel to speeds in order of 1500 RPM.
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