XR Flight Operations Manual Version 3.0
Copyright 2006-2018 Douglas Beachy. All Rights Reserved.
38
Fuel Dump Button
Note: Main/RCS Engine Fuel, SCRAM Fuel, and APU Fuel are not
compatible. Fuel may only cross-feed between the MAIN and RCS
tanks.
4.
When you flip the switch for a supply line you will see the line pressure drop
and fluctuate slightly as fuel or LOX flows into the tank; this is normal. Note
that line pressure will be
higher
when refueling on the ground than when
refueling while docked; line pressure affects the speed at which the tank fills,
so refueling will take longer when docked than when on the ground.
5.
You can monitor the ship's mass as fuel or LOX is loaded via the
SHIP MASS
display on the lower panel. Refueling continues until you close the supply line
via its switch, close the fuel or LOX hatch, or move the ship with thrusters
(which disconnects the lines). Each supply line switch will also automatically
close when the tank it feeds is full. The only exception to this is when the
main tank is full but is still cross-feeding into the RCS tank; at that point
refueling will continue until the RCS tank is also full, at which point the main
supply line feed will close automatically.
6.
When you are finished resupplying, close the fuel and LOX hatches; you are
now ready for takeoff!
Note that the ship will switch over to external Oxygen (
O
2
) when you are 1) docked
with both airlocks open, or 2) landed on Earth with both airlock doors or the crew
hatch open. It is a good idea to do this whenever possible because it will help to
conserve your onboard oxygen supply.
XR2/XR5 Only: Using Payload Bay Fuel/LOX Tanks
XR vessels that have a payload bay can also attach and use auxiliary fuel and/or LOX
tanks in the payload bay. There are three types of consumables tanks available:
1.
Main fuel bay tank
2.
SCRAM fuel bay tank
3.
LOX bay tank
These tanks vary by XR vessel, but they all function in the same way: when bay
tanks are attached, your fuel/LOX gauges are updated to reflect the increased fuel
load, and bay tanks will drain before your internal tanks. Some additional notes:
