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3.1.4
Declared Components List
A full components list can be found in appendix (E).
3.2
Mechanical interfaces
Figure (7) shows the simple bracket that will be used to attach the frame to
the base. Four of these will be used to connect the frame to the structure.
These can either be connected to the inside or outside rails of the frame at
any point along their length.
3.2.1
Accommodation Requirements
This total frame requires 350*300*200 mm before including the brackets for
attaching this to the gondola floor. These brackets can either be attached on
the inside face of the frame or outside depending on convenience and volume
restrictions.
The 300*200 mm face must face downwards and have access to the atmosphere in order to take samples whilst minimising contamination. Apart
from this, the design has been made to be highly flexible as is desired for a
case where arrangement changes may need to be made close to the launch.
3.2.2
Attachment Concept and Foot Pattern
In the name of flexibility, the attachment concept has been kept as simple as
possible. The advantage of using a frame with rails allows the use of brackets
that can be attached anywhere along the length of the frame. Both balloon
gondola possibilities use M10 bolt connectors but it is unknown yet how far
apart the bolt rails are inside the gondola. The bracket and bolt arrangement
can be seen earlier in figure (7).
A sketch of the connection to the gondola can be seen in figure (8).
3.3
3.3.1
Thermal interfaces
Thermal Design
3.3.1.1 Thermal Design Requirements For different subsystems different thermal requirements apply. Critical part of the control box is the
pressure sensor, which provides compensated data from 0◦ C to 85◦ C. The
battery box should be kept on a level as high as possible to 70◦ C (Figure (9))
to get maximum performance. The pump specifications state that it will operate between 5◦ C and 40◦ C. However, it has flown previously and operated
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