XR Flight Operations Manual Version 3.0
Copyright 2006-2018 Douglas Beachy. All Rights Reserved.
32
Default Secondary HUD Mode 3
By default the five secondary HUD modes are configured for (1) reentry, (2)
ascent, (3) atmospheric flight, (4) docking, and (5) on-orbit operations. You may
customize all five secondary HUD modes by specifying which data fields to display
for each mode as well as the color and transparency settings for each mode in
your XR vessel’s configuration file (e.g.,
XR5VanguardPrefs.cfg
)
.
11.
You will notice the fuel flow and, correspondingly, the thrust for the SCRAM
engines increase as velocity increases up until the fuel flow reaches the
maximum flow rate. The flow rate determines the maximum amount of fuel
the engine can burn, and therefore the maximum thrust the engine can
produce.
12.
You will also notice as speed increases the SCRAM TSFC (
Thrust-Specific Fuel
Consumption
) will go down, which means the engines are being more
efficient. As speed increases beyond Mach 7-9, however, engine efficiency
will gradually decrease. This is normal and is due to a combination of two
factors: 1) the shape and design of the engines, and 2) the decreasing delta
between the compressed freestream temperature and the SCRAM burner
temperature as velocity increases.
13.
Use elevator trim (
CTRL-,
and
CTRL-.
or
INS
and
DEL
) to maintain a smooth,
gradual ascent as you accelerate. Adjust ascent rate to keep dynamic
pressure around 10 kPa. Try to fly smoothly by making small adjustments to
the elevator trim. As your velocity and altitude increase, adjust your ascent
rate to keep lowering dynamic pressure gradually below 10 kPa down to
about 4 kPa. For optimum efficiency you want to have enough oxygen for the
SCRAM engines to operate at peak thrust but still have minimum air
resistance.
