QB50 System Requirements Document

4.1 MechanicalAs shown in Figure 5, the mechanical interfaces between the CubeSats and the StackPack arethe following:The StackPack Guide Rails with the CubeSat Guide Rails,The StackPack Pusher Plate with the back CubeSat feet,The StackPack Door with the front CubeSat feet.4.2 AccessibilityThe StackPack provides accessibility to the CubeSat through the hatch situated on the frontdoor (TBC before CDR). This accessibility area can be used for various activities such as:Remove the RBF mechanismPlug an umbilical connectionSupply power connection to the CubeSatProvide data connection with the CubeSatRead CubeSat nameQB50-SYS-4.2.1.4.3 NamingQB50-SYS-4.3.1.After integration into the deployer, the CubeSat shall only requireaccess, for any purpose, through the access hatch in the door ofthe deployer.The CubeSat name shall be printed, engraved or otherwise markedon the CubeSat and visible through the access hatch in the door ofthe deployer.4.4 ThermalThe thermal interfaces between the CubeSats and the StackPack are formed by the conductivemechanical interfaces (Guide Rails and Feet). Apart from that, there exists convection (untilvacuum conditions) and heat exchange by radiation between the CubeSats and the StackPack.4.5 ElectricalThe StackPack will provide electrical interface to the CubeSat before launch while it isintegrated in the dispenser. The concept is to plug a connector to perform the correspondentpower supply and battery charging activities of the CubeSat. The electrical connection will beimplemented through the front door hatch. The specific connector is TBD.Issue 3 22 5 February 2013