Space Shuttle Coordinate
System
The space shuttle coordinate
reference system is a means of locating specific points on the shuttle.
The system is measured in inches and decimal places; X_{o}
designates the longitudinal (forward and aft) axis, Y_{o}
the lateral (inboard and outboard) axis and Z_{o} the vertical
(up and down) axis. The subscript 'o' indicates orbiter; similar reference
systems are used for the external tank (T), solid rocket booster (B),
and overall space shuttle system (S).
In each coordinate system, the Xaxis zero point is located forward
of the nose tip; that is, the orbiter nose tip location is 236 inches
aft of the zero point (at X_{o} 236), the external tank
nose cap tip location is at X_{T} 322.5, and the solid rocket
booster nose tip location is at X_{B} 200. In the orbiter,
the horizontal X_{o}, Y_{o} reference plane is located
at Z_{o}400, which is 336.5 inches above the external tank
horizontal X_{T}, Y_{T} reference plane located
at Z_{T}400. The solid rocket booster horizontal X_{B},
Y_{B} reference plane is located at Z_{B} 0 and
coincident with the external tank horizontal plane at ZT 400. The
solid rocket booster vertical X_{B}, Z_{T} planes
are located at + Y_{S} 250.5 and Y_{S} 250.5. Also,
the orbiter, external tank, and shuttle system center X, Z planes
coincide.
From the X = 0 point, aft is positive and forward is negative for
all coordinate systems. Looking forward, each shuttle element Yaxis
point right of the center plane (starboard) is positive and each
Yaxis point left of center (port) is negative. The Z axis of each
point within all elements of the shuttle except the SRBs is positive,
with Z = 0 located below the element. In the SRBs each Zcoordinate
point below the X_{B}, Y_{B} reference plane is
negative and each point above that plane is positive.
The shuttle system and shuttle element coordinate systems are related
as follows: the external tank XT 0 point coincides with X_{S}
0, the SRB X_{B} 0 point is located 543 inches aft, and
the Y_{o}, Z_{o} reference plane is 741 inches aft
of X_{S} 0.
