STEM Products & Programs

STEM™ (Storable Tubular Extendible Member)

STEM

BI-STEM

Interlocking BI-STEM

Benefits Very small stowed package Retractable

SELENE Lunar Sounder Antennas Hubble Solar Array Deployer

JWST Mid-Boom Deployment Actuator

Applications Linear actuators Antennas Deployment drives

Quad-STEM Deployment Actuator

STEM™ (Storable Tubular Extendible Member)

Flight History

3

Approx Date Dia (ins) Length Program Material Mar-88 0.86 20 ft Hubble Space Telescope Stainless steel Jun-92 1.34 20 m Waves in Space(WISP) Beryllium copper Nov-93 1.34 15.1 ft Microlab Gravity Gradient Boom Stainless steel May-94 0.86 9 ft Skynet boom Stainless steel Sep-98 0.86 9.8 ft Geolite boom Stainless steel Mar-00 0.86 9.8 ft Optus boom Stainless steel Oct-02 0.5 49.2 ft Selene Lunar Orbiter Beryllium copper Apr-03 1.34 22 ft ISIS Mast Deployer Stainless steel Jul-04 0.86 26 and 36 ft Oedipus Sounding Antennas Beryllium copper Oct-05 1.34 51 in Mars Pathfinder Rover Ramps Stainless steel Jan-06 1.34 15.1 ft FalconSat 3 Gravity Gradient Boom Beryllium copper Oct-07 0.86 20 ft 0.86 Dia STEM Drive Stainless steel Dec-07 1.34 65/130 ft Dual STEM Drive Stainless steel Dec-10 2.00 36 ft AECL Commercial Boom Stainless steel

Hubble Space Telescope

•Solar Array Deployer

•0.86-Inch Diameter BI-STEM

•Stainless Steel •Single Drive Motor for Four Units/Wing

•20-Foot Length •Retraction Capabilities

Customer: Astrium (Matra Marconi)

Waves in Space Plasma (WISP) System

• Features – Length – 20 meters – Diameter – 1-3/8 in – Straightness: <0.75-

inch at deployment

– Two-Fault-Tolerant Safing System

– Antenna Ejection System

– Deployment Control System

Microsat and FalconSat-3 Gravity Gradient Boom

• 1.34” Dia • 15 ft long • Deploys by simply releasing

a pyro release • Beryllium copper boom • Status: On orbit

0.86” Dia Bi-STEM Deployer

• 0.86” dia Bi-STEM deployer in test fixture

• Weight 3.5 lbs + .09 lb/ft for boom

• Up to 20 ft long • Rated push force 5 lbs • Launch lock on base for

pyrotechnic release • Program: Optus, Geolite,

Skynet

SELENE Lunar Orbiter

– Developed for ISAS for SELENE Lunar Orbiter

– Four-1.2 cm Interlocked BI-STEM™ – 15-meter deployed length – <2 kg mass

ISIS 1.34” Dia Bi-STEM Deployer

• Used for the ISIS program to deploy a telescopic mast

• Push force 40 lbs maximum • 22 ft boom • Weight 11.1 lbs • Customer: Goddard Space Flight

Center

Mars Pathfinder Rover Ramps

Low Mass: 1.0 kg (2.2 lb) Small Stowed Package: 7.6 cm (3.0 in) diameter 42 cm (16.5 in) long Self-Deployed Stable Structure: Supports 12.5 kg (27.6 lb) Rover Provides 136 cm (53.5 in) long ramp

Customer: JPL

0.86” Dia High Force STEM Boom

• Capable of 50 lbs deployment force limit load. Working load 17 lbs

• Weight 3.5 lbs + 0.068 lbs/ft of STEM

• Status: Prototype

Dual STEM

• Dual booms 65 ft long. Tip to tip length is 130 ft.(Two units each 130 ft tip to tip shown)

• 1.34” diameter STEM elements

• Weight 28.5 lbs

• Deployment time 5 minutes

• Status: Prototype

1.34” High Force STEM Drive

• 120 ft long • Weight 24 lbs • Maximum push/pull force 150 lbs • Status: Program cancelled

Quad STEM

Low Mass: 1.0 kg (2.2 lb) Small Stowed Package: 7.6 cm (3.0 in) diameter 42 cm (16.5 in) long Self-Deployed Stable Structure: Supports 12.5 kg (27.6 lb) Rover Provides 136 cm (53.5 in) long ramp

•Unit drives 4 STEM elements out simultaneously, each 22 ft long •Retractable

•Deploy time 2-3 minutes

•Status: Prototype

2” Commercial Bi-STEM Deployer

•Commercial STEM deployer

•Horizontal usage for pushing out carts, instruments, and sensors in nuclear power plants

•71 lbs

•36 ft length

•110 Vac

•Factory adjustable speed, forward, reverse, and over-travel stop switch.

1.34” Dia JWST STEM Boom

• JWST Mid Boom deployment actuator

• 22 ft boom • Push force 180 lbs, pull force

300 lbs • 15.2 lbs • Brushless DC motor • Status: JWST qual program in

progress

NANO STEM

• 0.36 lb deployer + 0.025 lb/ft STEM

• Max push force 50 lbs at limit load.

• Useful as an antenna, cubesat deployable, instrument boom, boom to drive a telescopic mast

• Internal motor (Not shown in this model)

• Retractable • Length adjustable to 20ft+ • Status: Prototype

Nano STEM inside cubesat volume