• Robust design intended for many deploy/retract cycles: life-tested to 10,000 cycles

• Preloaded latches at joints available for precise/repeatable deployment position

• Extreme deployment/retraction force available due to robust lead-screw drive train

• Available with load limiter for minimizing the reaction loads associated with moving very large masses

• Metallic and composite materials can be chosen to optimize stiffness, strength, weight or dimensional stability

• Flight-proven design; currently being used for International Space Station build

• High torsion and bending strength

• Very scalable design; available form 3 inch diameter to 30 inch diameter or more

• EVA-safe design

• Electrically conductive to prevent static discharge

• Can be manually deployed and retracted during integration/test

• Cabling and utility compatible

• Size: 6-inch diameter, 44-inch length stowed, 216-inch deployed length

• Number and size of tube sections: 6 Tubes ranging from 6 to 3.5 inches
in diameter

• Materials: Aluminum construction

• Push force: 422-lb push force with 372 in-lb of input torque

• Weight: 45 lbs

• Bending Strength: 16,200 in-lb

• Torsional Strength: 1350 in-lb

• Reliability: Met all performance requirements after exposure to 10,000
deploy/retract cycles

* Space Station Orbit Replaceable Unit

Program

Customer

Flight

Application

ORU Transfer Device

Lockheed, Houston

STS-87, Columbia

Hardware Demonstration

ORU Transfer Device

Lockheed, Houston

STS-101, Atlantis

Permanent Installation into Space Station

• For each tube section, there is a minimum 0.5 inch reduction in diameter from the outer most tube.
For example, a 4 tube boom that has a maximum diameter of 4 inches, the tubes would be 4, 3.5, 3, and 2.5 inches in diameter.

• For each tube section, there is a reduction in tube length of approximately 2 inches. The stroke of each tube is approximately 1.5 diameters shorter than the tube length.

• For latched and preloaded tube joints, stiffness approaching that of a tapered tube of the same dimensions as the deployed boom can be reached for loads that do not exceed the joint preloads.

• For unlatched and non-preloaded tube joints, stiffness approaching that of a tapered tube of the same dimensions as the deployed boom, can be reached after the dead-band of the joints is removed.

• For unlatched tube joints, there will be a dead-band on the order of (tan-1 (0.01/tube overlap length)) for each tube segment.