2-15 Force on the hinge at every position during the deployment of layer 1 ...............31

2-16 Force on the hinge at every position during the deployment of layer 2 ................32

2-17 Velocity comparison between single stage and stage wise deployment
 of tent .................................... .................................... ........... 33

2-18 Acceleration comparison between single stage and stage wise deployment
 of tent .................................... .................................... ........... 33

3-1 Tw o level closed loop deployable m ast............................................................. 35

3-2 Stage 0 for m ast .......................... ........ .. .. ..... ............... 36

3 -3 Stag e 1 for m ast ................................................................... 3 7

3-4 Stage 2 for m ast ......................... ........ .. .. ..... ............... 37

3-5 Combination of struts and plates, a single side of a level.................................. 38

3-6 Length of strut when fully deployed, stowed and free length of spring ................39

3-7 Typical displacement vs. force in z direction for mast ........................................40

3-8 Position, velocity and acceleration analysis during deployment of level 1 ..........51

3-9 Position, velocity and acceleration analysis during deployment of level 2...........52

3-10 Force on the hinge at every position during the deployment of level 1.................53

3-11 Force on the hinge at every position during the deployment of level 2.................54

3-12 Velocity comparison between single stage and stage wise deployment
 of m ast..................... .. ......... ................ ...............................55

3-13 Acceleration comparison between single stage and stage wise deployment
 of m ast .................... .... ......... .............. ...............................55

4 1 M a st I ........................................................................... 5 7

4 -2 M a st II .............................................................................................................. 5 8

4-3 Deployable mast ......... ......................... ............. ... .......... 59

B-l Stiffness of mast I in the x direction ........... .................................. .. ......... 83

B-2 Stiffness of mast I in the y direction ........ ................................................ 84

B-3 Stiffness of mast I in the z direction .................. ...................... 84