CG Dummies - CG-3/CG-5/160-0000/CG-50/CG-95/170-0000/CG-98
Overview
The CG dummies were the workhorses of military ejection seat testing in the 1960’s and early 1970’s. Their use continued into the 1990’s. They feature extremely rugged construction and ample capacity for on-board telemetry systems. They can provide whole body acceleration and angular rate information as well as windblast pressure. They have no compliance in the spinal column. A range of sizes was produced based on USAF, USN and JSDF anthropometry:
| Description | Designation | Part # |
|---|---|---|
| CG Male 3rd Percentile | CG-3 | CG-3 |
| CG Male 5th Percentile Japan | CG-5J | 160-0000 |
| CG Male 5th Percentile | CG-5 | CG-5 |
| CG Male 50th Percentile | CG-50 | CG-50 |
| CG Male 95th Percentile Japan | CG-95J | 170-0000 |
| CG Male 95th Percentile | CG-95 | CG-95 |
| CG Male 98th Percentile | CG-98 | CG-98 |
The original designs were designated the GARD dummies (Grumman Alderson Research Dummies) developed by both companies in New York and were modified by Humanetics, Inc. in California.
Dummy Use
These dummies are used to test ejection seats in fighter aircraft. They are placed into the ejection seats in the cockpit section of the aircraft which are propelled by rocket sleds to aircraft operational speeds. The seats with the dummies are ejected to simulate actual operating conditions including the rocket powered ejection, man-seat separation, and parachute descent. Transducer readings on whole body acceleration and angular rate (pitch, roll, and yaw) are received by the onboard data acquisition system and transmitted to a range ground station. The data is used to analyze acceleration effects of the ejection on the occupant and performance of the ejection system and parachute
Features
• Sit-stand construction.
• Articulated arms and legs.
• Rigid torso case from neck to hips.
• Torso case front door for insertion and removal of optional telemetry package with accelerometers, rate sensors, signal conditioners, pressure transducer signal conditioner.
• Torso covered in foam and canvas for compliant feel.
• Shoulder yokes to allow arm anthropometric motion. Elbows and wrists articulate.
• Hip yokes to allow leg anthropometric motion. Knees and ankles articulate.
Description & Construction
The heads are made of vinyl skin over aluminum skulls with removable caps and cap skins to give access for optional pressure transducers and linear accelerometers. One head size is used for all dummies as anthropometry was not determined to be great enough to require variation.
The necks are a steel clevis bolted to the head with a transverse bolt fastening them to a drilled square tube welded to the torso. Very little motion occurs.
The shoulders consist of steel yokes fastened into the torso case and rotating around the lateral axis providing coronal plane rotation.
The arms are vinyl skin with urethane foam filling over steel bones. The hands are vinyl over steel bones.
The upper arms bolt to the shoulder yokes. This joint provides rotation in the lateral plane.
The lower arms bolt to the upper arms at an integral clevis providing forearm flexion in an inboard facing plane. Single or double pin joints fasten the wrists and the hands depending on the model.
The torso is a welded steel structure which includes the neck bracket, the thorax, lumbar, abdomen and pelvis in one inflexible unit. The torso case of the larger dummies is oval at the lateral surface, the smaller ones rectangular. A platform in the torso case mounts the electronics package: telemetry, rate sensors, signal conditioners, battery and power conditioning. The torso cases are covered with canvas jackets having foam pads on their insides.
The legs are vinyl skin and urethane foam over steel bones. The upper legs fasten to the hip yokes where coronal and lateral plane rotation is provided. The lower legs flex at the knees and the feet have one pin joint at the ankle. The feet are vinyl skin over a steel bone.
Calibration
The following measurements are performed on each dummy:
• Weight of whole dummy
• CG of whole dummy in ejection seat
• External dimensions
Product Verification
First Technology Safety Systems’ manufacturing and inspection procedures result in high quality machined and molded parts. Procedures include certification of materials, verification of dimensions, and inspection of overall appearance of finished components.
Technical Specifications
Instrumentation
| Dummy Segment | Linear Accels | Angular Rate Sensors | Force & Moment | CH/Segment | ||||
|---|---|---|---|---|---|---|---|---|
| Ch | Qty | Ch | Qty | Ch | Qty | |||
| Head | 1 | 1 | 1 | |||||
| Torso | 1 | 3 | 1 | 3 | 6 | |||
Telemetry with signal conditioners and transmitter is mounted in the torso. An antenna may be mounted on the head with a modification. Transducer, data acquisition signal conditioners, wiring and telemetry part numbers and quantities, subject to quote. Additional channels may be used for seat transducers.
Assembly Weights
| Part | Weight (lb) | Weight (kg) |
|---|---|---|
| CG-3 | 1099 | 49 |
| CG-5J | 124 | 56 |
| CG-5 | 131.5 | 59.6 |
| CG-50 | 162 | 73 |
| CG-95J | 180 | 81.6 |
| CG-95 | 201 | 91.2 |
| CG-98 | 213 | 96.6 |
External Dimensions
| Part | Seated Height (in) | Seated Height (cm) | Stature (in) | Stature (cm) |
|---|---|---|---|---|
| CG-3 | 33.6 | 85.3 | 65.2 | 165.6 |
| CG-5J | 34.1 | 86.6 | 63.5 | 161.3 |
| CG-5 | 65.25 | 165.7 | ||
| CG-50 | 69.1 | 175.5 | ||
| CG-95J | 37.7 | 95.8 | 70.2 | 178.3 |
| CG-95 | 73.0 | 185.4 | ||
| CG-98 | 39.5 | 100.3 | 74.8 | 190.0 |