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Building and maintaining the International Space Station (ISS)
is a very complex task. An international fleet of space vehicles
launches ISS components; rotates crews; provides logistical
support; and replenishes propellant, items for science experi-
ments, and other necessary supplies and equipment. The Space
Shuttle must be used to deliver most ISS modules and major
components.
All of these important deliveries sustain a constant supply
line that is crucial to the development and maintenance of the
International Space Station. The fleet is also responsible for
returning experiment results to Earth and for removing trash and
waste from the ISS.
Currently, transport vehicles are launched from two sites on
Earth. In the future, the number of launch sites will increase to
four or more. Future plans also include new commercial trans-
ports that will take over the role of U.S. ISS logistical support.
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L
aunch
V
ehicLes
Russia
Japan
EuRopE
u.s.
soyuz sL-4
proton sL-12
H-ii
ariane 5
space shuttle
First launch
1957
1963 (Soyuz variant)
1965
1996
1996
1981
Launch site(s)
Baikonur
Cosmodrome
Baikonur
Cosmodrome
Tanegashima
Space Center
Guiana
Space Center
Kennedy Space Center
Launch performance
payload capacity
7,150 kg
(15,750 lb)
20,000 kg
(44,000 lb)
16,500 kg
(36,400 lb)
18,000 kg
(39,700 lb)
18,600 kg
(41,000 lb)
105,000 kg (230,000 lb),
orbiter only
Return performance
payload capacity
N/A
N/A
N/A
N/A
18,600 kg
(41,000 lb)
105,000 kg (230,000 lb),
orbiter only
number of stages
2 + 4 strap-ons
4 + 6 strap-ons
2 + 2 strap-ons
2 + 2 strap-ons
1.5 + 2 strap-ons
Length
49.5 m
(162 ft)
57 m
(187 ft)
53 m
(173 ft)
51 m
(167 ft)
56.14 m
(18.2 ft)
37.24 m (122.17 ft),
orbiter only
Mass
310,000 kg
(683,400 lb)
690,000 kg
(1,521,200 lb)
570,000 kg
(1,256,600 lb)
746,000 kg
(1,644,600 lb)
2,040,000 kg
(4,497,400 lb)
Launch thrust
6,000 kN
(1,348,800 lbf)
9,000 kN
(2,023,200 lbf)
5,600 kN
(1,258,900 lbf)
11,400 kN
(2,562,820 lbf)
34,677 kN
(7,795,700 lbf)
payload
Examples
Soyuz
Progress
Pirs
Service Module
Functional
Cargo Block (FGB)
Research Module (RM)
Multipurpose Lab
Module (MLM)
H-II
Transfer Vehicle
(HTV)
Ariane Automated
Transfer Vehicle
(ATV)
Shuttle Orbiter
Nodes, U.S. Lab
Columbus, JEM,
Truss elements
Airlock, SSRMS
Soyuz
Proton
H-II
Ariane
Shuttle
Roscosmos
Russia
JAXA
Japan
ESA
Europe
NASA
United States
The largest U.S. and Russian launch vehicles are used to place elements of the ISS, crew, and cargo in orbit.
Eventually, Japanese and European launch vehicles will support cargo delivery. Currently, only the U.S. Space
Shuttle provides the capability to return significant payloads.
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oyuz
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P
rogress
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Kurs antenna
Booster attachment
structure
attitude Control
Engines
VHF Radio
antenna
primary
propulsion system
Environmental
Control Electronics
Bat-
teries
Crew
periscope
stowage
Reentry Module Hatch
Controls and Displays
solar array
Command
Radio antenna
Cargo Load
MaxiMuM
TypiCaL*
Dry cargo
such as bags
1,800 kg
(3,968 lb)
1,070 kg
(2,360 lb)
Water
420 kg
(925 lb)
300 kg
(660 lb)
air
50 kg
(110 lb)
47 kg
(103 lb)
Refueling
propellant
1,700 kg
(3,748 lb)
870 kg
(1,918 lb)
Reboost
propellant
250 kg
(550 lb)
250 kg
(550 lb)
Waste
capacity
2,000 kg
(4,409 lb)
2,000 kg
(4,409 lb)
1
1a
2
3
3a
4
5
6
7
8
9
10
Kurs
antenna
Booster
attachment
structure
attitude
Control
Engines
pressurized
instrumentation
section
Fluids storage
Tanks
probe and Drogue
Docking system
Kurs
antenna
Command
Radio antenna
primary
propulsion
system
stepped scan
array antenna
VHF Radio
antenna
solar array
Re
fue
lin
g M
odu
le
Ca
rgo M
odu
le
7a
Soyuz departs ISS.
Progress
approaches ISS.
* Measurements are
from the 21 P flight.
pressurized
section
orbital Module
Descent Module
instrumentation/
propulsion
Module
Progress prior to reentry.
Soyuz spacecraft have been in use since the mid-1960s and have been upgraded
periodically. Soyuz can support three suited crewmembers for up to 3 days. A nitrogen/
oxygen atmosphere at sea level pressure is provided. The vehicle has an automatic
docking system and may be piloted automatically or by a crewmember. The Soyuz
TMA used for the ISS includes changes to accommodate larger and smaller crewmem-
bers, an improved landing system, and digital electronic controls and displays.
Soyuz
S.P. Korolev Rocket and Space Corporation Energia
(RSC Energia)
Launch and aborts
1
Launch
1a
abort using escape rocket
2
Escape rocket jettison, nose shroud
separation (160 seconds in full)
3
staging (186 seconds)
3a
abort by separation of soyuz
4
orbital velocity (526 seconds)
Return
5
soyuz retrofire, orbital module separation,
reentry module separation
6
pilot parachute deploys
7
Drogue parachute deploys
7a
Main parachute reefed
8
Main parachute fully deployed
9
Reentry heatshield jettison
10
Landing, retro rocket firing
Mission Sequence
Launch mass
6,441 kg (14,200 lb)
Descent module
2,630 kg (5,800 lb)
orbital module
1,179 kg (2,600 lb)
instrumentation/
propulsion module
2,360 kg (5,200 lb)
Delivered payload
(with three crewmembers)
30 kg (66 lb)
Returned payload
50 kg (110 lb)
Length
7 m (22.9 ft)
Maximum diameter
2.7 m (8.9 ft)
Diameter of habitable
modules
2.2 m (7.2 ft)
solar array span
10.7 m (35.1 ft)
Volume of orbital module
6.5 m
3
(229.5 ft
3
)
Volume of descent module
4 m
3
(141.3 ft
3
)
Descent G-loads
3–4 g
Final landing speed
2 m/s (6.6 ft/s)
Progress is a resupply vehicle used for cargo and propellant deliveries to the ISS. Once
docked to the ISS, Progress engines can boost the ISS to higher altitudes and control the
orientation of the ISS in space. Typically, three Progress vehicles bring supplies to the
ISS each year. Progress is based upon the Soyuz design, and it can either work
autonomously or can be flown remotely by crewmembers aboard the ISS. After a
Progress vehicle is filled with trash from the ISS, and after undocking and deorbit, it is
incinerated in Earth’s atmosphere at the end of its mission.
Progress
S.P. Korolev Rocket and Space Corporation Energia
(RSC Energia)
Length
7.4 m (24.3 ft)
Maximum diameter
2.7 m (8.9 ft)
span with solar arrays
10.6 m (34.8 ft)
Launch mass
7,150 kg
(15,800 lb)
Cargo upload capacity
2,230–3,200 kg
(4,915–7,055 lb)
pressurized habitable volume
6.6 m
3
(233 ft
3
)
Engine thrust
2,942 N
(661 lbf)
orbital life
6 mo
Progress cargo module interior.
Progress prelaunch processing.
Soyuz descent module interior.
Soyuz being prepared for launch.
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M
uLti
-P
urPose
L
ogistics
M
oduLe
Body Flap
Thermal Control
Radiators
Remote
Manipulator
Flight
Deck
Forward attitude
Control Engines
nose Landing
Gear
Middeck
Fuel Cells
Main Landing Gear
Rudder and
speed Brake
Main Engines
orbital
Maneuvering
Engines
aft attitude
Control
Engines
Body Flap
Elevon
Hydrazine and nitrogen
Tetroxide Tanks
Maneuvering
Engines
orbital and
attitude Maneuvering
system pod
payload Bay
Door Hinges
Main Landing
Gear Door
Crew
access Hatch
star
Tracker
Forward Reaction
Control primary
Engines
Vernier
Thrusters
air Data
probe
External Tank
umbilical Door
Reinforced Carbon-
Carbon Leading Edge
nose Cap
MPLM interior during cargo transfers.
Shuttle berthed at the U.S. Lab, PMA 2.
The Shuttle approaches the
ISS carrying the Multi-Purpose
Logistics Module (MPLM).
MPLM berthed at Node 1.
Stowage within MPLM.
aft Bulkhead
aileron/Elevon
Space Shuttle Orbiter/
Discovery, Atlantis,
Endeavour
NASA/Boeing/Rockwell
The U.S. Space Shuttle provides Earth-to-orbit and return capabilities and in-orbit
support. The diversity of its missions and customers is testimony to the adaptability of
its design. As of mid-2006, the Shuttle
had flown 115 times. The Shuttle’s
primary purpose during the remaining
4 years of operation will be to complete
the assembly of the ISS. By 2010, it will
be retired.
Length
37.2 m (122.2 ft)
Height
17.3 m (56.7 ft)
Wingspan
23.8 m (78 ft)
Typical mass
104,000 kg (230,000 lb)
Cargo capacity
16,000 kg (35,000 lb)
(typical launch and return to ISS)
pressurized
habitable volume
74 m
3
(2,625 ft
3
)
Mission length
7–16 days, typical
number of crew
7, typical
atmosphere
oxygen-nitrogen
Cargo Bay
Length
18.3 m (60 ft)
Diameter
4.6 m (15 ft)
The Italian-built Multi-Purpose Logistics Module (MPLM)
serves as the International Space Station’s “moving van”
by carrying laboratory racks filled with equipment,
experiments, and supplies to and from the Station
aboard the Space Shuttle.
Mounted in the Shuttle’s cargo bay for
launch and landing, the modules are transferred
to the Station using the Shuttle’s robotic arm
after the Shuttle has docked. While berthed to
the Station, racks of equipment and stowage
items are unloaded from the module, and racks
and equipment may be reloaded to be transported
back to Earth. The MPLM is then detached from
the Station and positioned in the Shuttle’s cargo bay
for the trip home.
Multi-Purpose Logistics
Module (MPLM)/Leonardo,
Raffaelo, Donatello
NASA/Alcatel Alenia Space
Length
6.6 m (21.7 ft)
Diameter
4.2 m (13.8 ft)
Mass (structure)
4,685 kg (10,329 lb)
Mass (payload)
9,400 kg (20,700 lb)
Racks
16, 5 active
pressurized habitable volume
31 m
3
(1,095 ft
3
)
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a
utoMated
t
ransfer
V
ehicLe
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The HTV primary propulsion system
performs rendezvous maneuvers.
Interior view of
HTV pressurized
carrier.
The HTV is berthed onto JEM by the
Space Station RMS.
After rendezvous
with the ISS, the HTV
awaits grappling by
the SSRMS.
probe and Drogue
Docking system
integrated
Cargo Carrier
aTV
spacecraft
Bus
attitude Control
Engines (20)
primary
Maneuvering
Engines (4)
solar
array
Titanium Tanks,
(for carrying water,
propellant, and oxygen)
Environmental
Control system
ispRs (8)
aTV
spacec
raft
Bus
integrat
ed
Cargo C
arrier
(based o
n
MpLM d
esign)
iss
service
Module
pres
suriz
ed
unpr
essu
rized
avio
nics
prop
ulsio
n
Carr
ier
Carr
ier
Mod
ule
Mod
ule
primary
Engines
propellant
Tanks
Earth sensors
Lithium ion
Batteries
avionics
Exposed pallet
Exposed pallet
payload
international
standard payload
Racks (ispRs)
Forward attitude
Control Engines
Hatch and
Berthing Ring
(to iss node)
Cargo
Compartment
JAXA H-II Transfer Vehicle
(HTV)
Japan Aerospace Exploration Agency (JAXA)/
Mitsubishi Heavy Industries, Ltd.
The H-II Transfer Vehicle is an autonomous logistical resupply vehicle designed to
berth to the International Space Station using the Space Station Remote Manipulation
System (SSRMS). HTV offers the capability to carry logistics materials in both its internal
pressurized carrier as well as in an unpressurized carrier for exterior placement. It is
launched on the H-II unmanned launch vehicle and can carry dry cargo, gas and water, and
propellant. After fresh cargo is unloaded at the ISS, the HTV is loaded with trash and waste
products; after unberthing and deorbit, it is incinerated during reentry.
The ATV during manufacture.
Automated Transfer Vehicle
(ATV)
European Space Agency (ESA)/European Aeronautic
Defence and Space Co. (EADS)
The European Space Agency Automated Transfer Vehicle is an autonomous logistical
resupply vehicle designed to dock to the International Space Station and provide the crew
with dry cargo, atmospheric gas, water, and propellant. After the cargo is unloaded, the ATV
is reloaded with trash and waste products, undocks, and is incinerated during reentry.
Length
10.3 m (33.8 ft)
Maximum diameter
4.5 m (14.8 ft)
span across solar arrays
22.3 m (73.2 ft)
Launch mass
20,750 kg (45,746 lb)
Cargo upload capacity
7,667 kg (16,903 lb)
Engine thrust
1,960 N (441 lbf)
orbital life
6 mo
Cargo Load
Dry cargo such as bags
5,500 kg (12,125 lb)
Water
840 kg (1,852 lb)
air (o
2
, n
2
)
100 kg (220 lb)
Refueling propellant
860 kg (1,896 lb)
Reboost propellant
4,700 kg (10,360 lb)
Waste capacity
6,500 kg (14,330 lb)
Artist’s rendering shows the
ATV approaching the ISS.
Russian-built
probe and
drogue docking
system.
Length
9.2 m (30 ft)
Maximum diameter
4.4 m (14.4 ft)
Launch mass
16,500 kg (36,375 lb)
Cargo upload capacity
5,500 kg (12,125 lb)
pressurized habitable
volume
14 m
3
(495 ft
3
)
unpressurized volume
16 m
3
(565 ft
3
)
orbital life
6 mo
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The CEV approaches the ISS.
External/internal Cargo
Delivery and Disposal
internal Cargo Delivery
and Return
Crew Transportation
Rendezvous
Launch
Cargo/Trash
Disposal
Cargo Return
Crew Return
Cargo Transfer
proximity
operations
(prox ops)
iss ConTRoL ZonE
Docking or Berthing
Crew Exploration Vehicle
(CEV)/Orion
Commercial Orbital
Transportation Services
(COTS)
NASA has initiated the development of the Orion Crew Exploration Vehicle (CEV).
The first Orion flights are planned for 2012–2014 and will support the ISS.
NASA is seeking commercial providers of launch and return logistics services to support
the ISS after the Space Shuttle is retired. The first COTS demonstration missions are
planned for 2010.