Run flat tires are nothing new and I’ve been around for quite a while. The difference is more vehicles are starting to include them as standard equipment from the factory. Run flat tires are divided into 3 groups, Self-supporting, Self-sealing, and Auxiliary-supported. These tires will affect extrication operations during stabilization and possibly once parts of the vehicle are removed.
Run flat tires are designed to support the weight of the vehicle without any air in the tire. This is accomplished by several different types of run flat tires. The most commonly used run flat tire is a self supporting. A self-supporting run flat tire has a reinforced sidewall. Self-sealing tires use a self-sealing innerliner or similar feature to seal up small punctures. Auxiliary supported tires have a reinforcement that is attached to the wheel rather than the tire.
Auxiliary supported tires are typically found on armored vehicles. Many people may think armored vehicle to be a brinks money truck. However, with all of the turmoil around the world many executives and famous people have armored vehicles that look identical to a model you would find on the showroom floor.
One technique of stabilization of the vehicle is putting cribbing underneath the rocker panel and then pulling the valve stems so the vehicle can slowly lower onto the craving. When a vehicle has Run flat tires the vehicle may not securely rest on the cribbing.
By no means are run flat tires in issue for firefighters on an extrication seen. If the vehicle has run flat tires it would most likely be discovered after the initial stabilization is been completed and the firefighter assigned a stabilization checks the stabilization. If the vehicle didn’t completely rest simply placing a Wedge in may be enough to secure it.
Just like other New Vehicle Technology, run flat tires are another feature that rescuers need to have an awareness of. Run flat tires will not change our extrication techniques, rather require rescuers to be conscious of how a vehicle reacts to each step we talk during an extrication.
Zero-emission Electric School Bus
There are about 480,000 school buses in the United States with about 95 percent of them run on diesel. How many will change to electric?
Electric School Bus
There are about 480,000 school buses in the United States with about 95 percent of them run on diesel. Currently, electric buses can be about two to three times as expensive as diesel models. However, school administrators would ultimately save about $2,000 on fuel and $4,400 in maintenance every year. Many school districts across the United States are adding zero emission or hybrid school buses into their fleets.
States across the country are looking into using their legal settlement funds from Volkswagen defeat device settlement to buy electric school buses. Just like electric passenger a decade again were few and far between, electric school buses are sparsely found in school district’s fleets.
School Bus Types
Below is a quick review of the 4 different types of school buses used in the United States.
|School Bus Configurations
(Images of Contemporary School Bus Models)
|Configuration||Type A||Type B||Type C||Type D|
|≥10 typically 16-36||≥10 typically 30-36||≥10 typically 36-78||≥10 typically 54-90|
Type A Electric School Bus
Blue Bird offers electric Type C & D configuration school bus.
Propane School Bus
Green and blue bumpers and other surfaces on school buses can identify a school as electric powered. However, green is also used for school buses powered by Compressed Natural Gas (CNG) and Propane.
Fort Worth, TX Fire Department Heavy Rescue 38
Another awesome SVI Truck headed to the Lone Star State!
Checkout the SVI-built Heavy Rescue for the Lone Star State. The Fort Worth rig features a 20′ aluminum body mounted on a Spartan Gladiator LFD chassis with a 24-inch raised roof and powered by a Cummins X15 505HP engine. The new walk-around Heavy Rescue boasts a powerful 180,000-lumen LED Command Light CL602A-W4 light tower, OnScene Solutions heavy-duty aluminum cargo slides and much more!
Below are links to more information about this heavy rescue:
HydraFusion Struts used as ram for a dash roll?
The HydraFusion Struts were a game changer when PARATECH released the lifting/stabilizing device a few years back at FDIC. Rescuers can lift up to 10 U.S. Tons (9 metric tons) and to stabilize up to 20,000 lbs. with the tool. However, PARATECH’s HydraFusion Struts are not limited to just those two functions. The HydraFusion Struts can move metal!
I first ran across pictures of HydraFusion Struts used as ram from pictures that Brock Archer (Advanced Extrication) and Randy Schmitz ( Founder/Owner of Schmitz Mittz). Last weekend at Crunchtime Extrication, Paratech had one of their trailers at the training event and I had the chance to try a dash roll with a HydraFusion Strut. Take a look at the video below.
A few quick points:
- You can put the HydraFusion Strut in place to reduce any dash movement during reliefs cuts.
- HydraFusion Strut are portable and can be moved quickly to a vehicle hundreds of feet of the roadway.
- Depending on the length of the HydraFusion Strut used, strut extensions can be used to optimize dash movement.
- Using a HydraFusion Strut as a ram is an option, not always the option.