Sea Launch User's Guide

SCA702 and
SCA702GEM
The SCA702 has a diameter of 1664 mm at the spacecraft interface and
is attached to the spacecraft using four bolts. This adapter accommodates
the HS702-type spacecraft. The separation system uses four pushoff
springs to impart both an initial delta velocity with respect to the launch
vehicle and a spacecraft spin rate about an axis transverse to the launch
vehicle longitudinal axis. In principle, this relative motion is achieved by
limiting the stroke of two adjacent springs with respect to the stroke of
the other two opposing springs. In addition to the pushoff springs, there
are two electrical disconnects, which participate in the spacecraft
separation dynamics (see fig. 7-4).
The SCA702GEM is an SCA702 with minor modifications to account
for slightly different geometry at the spacecraft interface.
Figure 7-4. SCA702 Spacecraft Adapter
265807J3-090
REV B D688-10009-1 7-5