Pre-Phase A Report - Lisa - Nasa

7.1 System configuration 147
7.1.4 Launch configuration
The spacecraft size and shape are approximately optimized to contain the two optical
assemblies within the payload thermal shield. This shape combined with the desire to fit
the three spacecraft with their propulsion modules into the Delta II fairing places volume
constraints on the propulsion modules.
Figure 7.4 The three LISA spacecraft, each with attached propulsion module,
within the 9.5 foot fairing for the Delta II 7925 H. The launch stack is attached
to the upper stage by a custom launch adapter.
As is shown in Figure 7.4, the available static envelope within the 9.5 foot fairing allows
for the accomodation of the three-composite launch stack with a propulsion module on
the top. Preliminary analysis has shown that the first lateral eigenfrequency of the lower
stack meets the Delta II requirement (> 15 Hz), and so does the first axial frequency
(> 35 Hz).
Corrected version 2.08 3-3-1999 9:33