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QUALITY TESTING &

PERFORMANCE REPORTS

HALO™ Rollover Occupant Protection System – SWR Analysis Report

Please find the following information regarding the design and performance of the HALO™ Rollover Occupant Protection System. In response to a request for information, Safety Engineering International performed an FMVSS 216 type loading test on a single cab pickup truck model and the same model with the HALO ROPS equipped.  The FMVSS 216 Static Roof Strength test prescribes that a platen of specific size be placed at a specific angle relative to the vehicle body. The vehicle body is then secured to a base structure to stabilize it from shifting under the platen forces. The platen is then moved into the vehicle to a total displacement of 5” (127mm). The force required to achieve this displacement is measured to get the peak load value. This value is then divided by the weight to give the Strength to Weight Ratio (SWR) of a given vehicle.  The vehicle model used for the simulation does not have glass incorporated or doors incorporated, but does have coupling of the A and B post incorporated at the striker level. The cab was supported under the rocker panel and at locations under the frame rails in both simulations. The platen then applied loads to the base vehicle roof structure or with HALO equipped as applicable. The platen was displaced 5” in both cases. Screen shots of the simulations of the initial and final positions for both the base vehicle and HALO equipped vehicle simulations are shown below. 

FMVSS 216 SWR Diagram.png

In the graph below, the letter B (green line) shows the force in kilos (kN) for the HALO equipped vehicle with the peak at about 110kN at almost 5“(120mm). The letter A (red line) shows the base vehicle with a peak of about 42kN at a little more than 3” (80mm) of displacement.  

FMVSS 216 SWR Graph.png

With this information, and the curb weight of the vehicle, we can calculate the SWR of each of the vehicles tested. Using a weight of 4032 lbs (1828kg), the base single cab has a SWR of 2.34, while the HALO equipped vehicle has a SWR of 6.13. This indicates that a vehicle with a HALO equipped has an increased SWR of slightly better than a factor of 2. 

FMVSS 216 SWR Table.png

From these simulations as well as over 30 real world incidents in the last decade with HALO’s equipped on both single and double cab vehicles, we are confident that SWR will be increased to more than 4x and perhaps even better than 6x, as was the case in this simulation. 

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Download report below:

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