SuitSat2 as box SuitSat2 as flat box –One SMEX Lite solar panel per 4 sides of box –One SMEX Lite solar panel per top/bottom allows considerable surface area for switches, connectors, antennas, handle, etc. –Two SMEX Lite solar panels per top/bottom generates more power (except spin Beta 0°) but leaves no unused area. –External dims rounded from 17.2x8.2 inches to 18x9 inches –For now, I assume everything inside will fit in say 16x16x7 inches –Max inertia axis suggests spinning as coin (stable) Individual covers for solar panels –Highly discouraged. Double CTB (NOMEX soft-wall container) –Exterior 502x425x502 mm (19.76x16.73x19.76 in) –Interior 486x410x460 mm (19.13x16.14x18.11 in) Ejection Box –Probably bigger than interior of Double CTB (but it’s close…) –Hard-wall to protect solar panels –Lid flips open to allow satellite (with handle) to slide out –Similar in concept to CalPoly’s P-POD launcher for CubeSats, except: No ejection springs. Glove-friendly handles. No mechanisms. Manual latch for lid. CalPoly sliding surfaces are silicone-impregnated aluminum with tight tolerances. With 4” CubeSats, CalPoly’s concerns are minimal of shrinkage induced friction. Scaling up to 18”, we should consider a better approach to sliding. –Shallow depth for sliding rails is better, though all sliding mechanisms are inferior due to concerns of variable friction. –In ejection views to right, sliding surfaces are RED. –Consider redesigning sliding surfaces to approach statically determinant (which helps prevent “sticking” due to thermal effects, etc). –Alternatively to Double CTB, could be sized to fit a 19” electronics rack. SuitSat2 or SuitSat2 Ejection Box KF4KSS July 9, 2009 AM Latching Lid Latching Lid Spin axis and antennas

Expanding on Ejection Box Requirements –Provide minimal impact resistance to prevent damage to solar cells due to rough handling –No tools required for opening/deployment –No tools required for optional repacking/closure –Additional access to a safe/arm port without opening for deployment. –Vents (does not hold pressure) –Provide adequate structural stability for mounting/stacking/strapping. Desirements –Compatible interface Double CTB, 19” rack, or TBD Handles, loops, velcro Integral instructions? Manual latch Which is easier: –Is there a human factors difference between lids? 19”x19” versus 19”x9” Could thermal expansion/contraction lead to friction? –See next page If the big Lid is broken into two separately latching lids, then one could serve as access port to Safe/Arm, battery charge, etc, while the second lid prevents SuitSat2 from exiting the Ejection Box and protects the SMEX panel. SuitSat2 or SuitSat2 Ejection Box KF4KSS July 9, 2009 PM Latching Lid Latching Lid or Separately Latching Lids

Thermal Shrinkage of Ejection Box? Could thermal expansion/contraction lead to friction? –My thought is SuitSat2 may be room temperature, but the Ejection Box may cool, causing it to shrink. This would add to friction. It may be worth making the rails “statically determinant” (or close), meaning that if the Ejection Box shrinks, it imparts no additional force on SuitSat2. Read “no additional force” to mean “no additional friction”. –Sketch on right also has advantage of tolerances from assembly of SuitSat2 and Ejection Box don’t immediately stack as friction resisting deployment. If Ejection Box is covered in NOMEX or other blanket, maybe this shrinkage concern of mine disappears. KF4KSS July 9, 2009 PM SuitSat2 (there would also be non-determinant forces in and out of plane) Ejection Box SuitSat2 This bar on edge of satellite constrains forces in one direction, but allows Ejection Box shrinkage. This bar on edge of satellite constrains forces in two directions. No contact. Satellite interface in this notch may “slide” left and right to allow for expansion/contraction. Satellite interface in this notch is fully constrained, except for deployment direction.

Expanding on SuitSat2 structure Can all the Hammond boxes mount to the bottom floor of a open box, 16x16x7 inches? Paired with my favored Ejection Box design, then the SuitSat2 floor is the only “structural” panel. The rest of the structure could be angles and a non-structural AL panel as required. KF4KSS July 9, 2009 PM Whip antenna Structural floor w/ 4 AL angles Frame of 8 AL angles 4X sides On bottom Handle 2 angles are heavier and have “rails” for Ejection Box On top

Issues List Russians wouldn’t want a container that couldn’t be collapsed. That’s why original thought was to have covers (stackable when it’s all said and done). Russians are proposing a pencil (not a pancake), where the sides are long and narrow, not wide and short. I guess that’s easier to get through a small hatch. It would likely be stable in a “flat spin”, not through axis of symmetry. Interface to the Russians… Fit through Progress hatch? What’s the size? Is one handle going to work? Excessive friction towards one side + one centered handle = binding? –Does orientation of handle matter? If you have to put SuitSat2 back into the Ejection Box, is it a huge pain? –Should we do something besides flare the rails open at the entry end? Is one SMEX panel in each of 6 directions enough power? Do we passively/actively induce spin similar to AO-51? Assume it will be released with a minor tumble. KF4KSS July 9, 2009 PM

Collapsible Container (not really an idea) 1.Remove top 2.Sides are spring loaded to pop outward 3.Release satellite (springs?) 4.Top can be temporarily velcro’ed to either either side of container base 5.Once indoors, the top can be attached to collapsed container base. KF4KSS July 9, 2009 PM 1 & 2 5 Lid Base Lid Base No rails!

Radical thoughts I Send 6x SMEX covers with satellite. –Stack them all on empty underside opposite the “Safe/Arm” panel using velcro. KF4KSS July 9, 2009 PM Thickness exaggerated

Radical thoughts II Eliminate covers altogether by “flipping” the solar panel backsides out for storage. Other (more useful) hinge lines may be possible. KF4KSS July 9, 2009 PM Velcro to flat position cells blank backside blank backside Hinges backside blank cells Hinges cells Hinges Velcro to flat position blank backside