The 28mm UAV bungee cord is designed as an elastic power component for fixed-wing UAV catapult launchers and drone launch rail systems. It combines a durable polyester braided jacket with a high-elasticity imported latex core for controlled force development and repeated extension.
Single-cord load-extension testing measured approximately 760 N at 1.5× stretch, 1,300 N at 2.1×, and 1,900 N at 2.4×.
MFU supplies custom cord lengths for different UAV launcher configurations. Technical load-extension data is available for launcher design and bungee selection.
Designed for UAV catapult launch systems, the 28mm bungee cord combines a high-strength polyester braided jacket with an imported latex elastic core.
The cord is designed for applications where controlled elastic force, repeatable extension and high energy output are required. Custom lengths and end configurations can be produced according to the launcher structure.
| Parameter | Specification |
|---|---|
| Nominal Diameter | 28 mm |
| Outer Layer | Polyester |
| Elastic Core | Imported latex from Malaysia and Thailand |
| Construction | Braided Polyester Jacket + Multi-Strand Latex Core |
| Application | UAV / Drone Catapult Launch Systems |
| Length | Custom |
| End Termination | Custom Loop / Ring / Protected Loop |
| Force Test | Single-Cord Load–Extension Test |
| Supplier | Manufacturer |
The following values are based on tensile testing of single bungee cord.
Stretch ratio is calculated as:
Final Length ÷ Original Length
For example, a 1.5× stretch ratio means that a 1-meter cord is stretched to 1.5 meters.
| Stretch Ratio | Extension | Measured Force |
| 1.5× | 150% | 760 N |
| 1.7× | 170% | 900 N |
| 1.9× | 190% | 1100 N |
| 2.1× | 210% | 1300 N |
| 2.2× | 220% | 1500 N |
| 2.3× | 230% | 1700 N |
| 2.4× | 240% | 1900 N |
The measured tensile force increases progressively as the cord is extended.
At a 1.5× stretch ratio, the single-cord load is approximately 760 N.
At 2.1×, the load increases to approximately 1,300 N.
At 2.4×, the measured load reaches approximately 1,900 N.
This load–extension data can be used as a reference when evaluating the required number of cords, working extension and launcher configuration.
The outer braided layer is made from polyester yarn and is designed to protect the internal elastic core during repeated extension.
The braided construction also helps maintain the cord geometry and provides a durable interface between the elastic element and the launcher structure.
Outer Material: Polyester
Multiple strands of imported latex form the main elastic component inside the cord.
The latex core generates increasing tensile force as the cord is extended and provides the elastic energy required by the launch system.
Core Material: Imported Latex
The final force characteristics depend on the latex configuration, cord construction and working stretch ratio.
The 28mm cord can be integrated into different elastic launch configurations, including:
The required configuration should be selected according to the aircraft mass, target launch velocity, available acceleration distance and launcher geometry.
For UAV launcher projects, cord diameter alone should not be used to determine launch capability.
The main design parameters include:
Based on these parameters, the load–extension characteristics of the bungee cord can be used to evaluate a suitable elastic configuration.
MFU can manufacture the 28mm bungee cord according to different launcher designs.
Available customization includes:
For engineering evaluation, provide the UAV weight, target launch speed, rail length and expected bungee extension.
The values shown above are measured single-cord test data and are intended as technical reference data.
In actual use, even the same 28mm bungee cord can be customized to have different performance characteristics.
Actual launcher performance depends on the complete launch system, including cord quantity, initial length, extension distance, pulley ratio, carriage mass, rail friction and system efficiency.
Breaking strength should not be treated as the normal operating force of the UAV launch system.
