Dedicated to safety
From selling safety equipment, he next moved into manufacturing and product development. When Simpson moved most of its business to New Braunfels, Texas, Nelson wanted to remain close to his roots in California. After a short stint in the Simpson retail store in Gasoline Alley, Bill Simpson called him into his office. “He asked whether I wanted a job or if I wanted a career,” he says. “I had to think about that for a second! He asked me to run the manufacturing plant where we make the suits. I replied that I didn’t know much about sewing, but he said, ‘you know about our product, and you know about our quality’.”
From there, Nelson absorbed everything about the makeup and function of the protective suits, working with product developers on new designs, and educating drivers and new crew members or salespeople who came by the factory.
“Today, as Operations Manager for the fire suit division, I wear several hats,” he relates. “I do a lot of the development and testing of the protection of the suits, which meet SFI or FIA certification. We’re always trying to get the lightest-weight material in to offer the most protection, so I’m always thinking about different materials for comfort or for protection, always trying to find new ones and be innovative in our materials and in the functions of our suits for the drivers. Many drivers now look at the suit as fashion as well as function. They know that it meets the certification, but they want to look good as a driver. Simpson is tasked with making suits that fulfil both goals.”
He cites the development of thinner materials with better fire-resistant properties as the biggest advance in fire-suit safety during his time at Simpson. He explains, “In the past, fire suits were much thicker, so drivers tended to sweat more inside the suits. Sweat is not your friend in a fire suit, and not just because of heat exhaustion. Most drivers don’t get first- or second-degree burns from the flames. They get them from the heat transferring through the suit. And if you have any type of moisture on your body, that will heat up first and blister your skin.
“Thinner materials, in multiple layers, slow down that heat transfer through the suit. A three-layer suit with thinner materials will be more comfortable and offer better thermal protection performance (TPP) than a thicker, two-layer suit because the air gaps act as a form of fire block. And the materials being as light as possible, but still breathable, helps dissipate the sweat off your body to help reduce any type of injury if they were to catch on fire.”
Tony Pedregon had first-hand experience of the fire-retardant properties of the suits that Nelson helped to develop. “In one of the worst fires that I had in my career, the car blew up at 300 MPH,” says Pedregon. “The engine in front of me caught on fire and blew the body off. It only lasted a couple of seconds, but the suit burned through at least the first four or five layers of the suit, which was probably a seven-layer suit at the time.
“Dave was always there to help us develop not just a better suit, but also a better and more comfortable glove, so that we could grip the wheel better. I got second and third-degree burns on my hands in that accident. We had developed the outer layers of the glove, but the grip on the palm side was just one layer. Dave and I were communicating a day or two after that happened and they instantly started to look into making them better. I still have those gloves in my glass case, but before they went into it, they went to Dave for Simpson to inspect them and investigate what had happened. And of course, since then, there are more layers on the palm side.”
In 2001, Nelson’s quest for better materials also resulted in the switch from heavy, embroidered-cotton NASCAR pit-crew shirts to lighter, more comfortable, and considerably cheaper shirts printed with creative designs via the sublimation process.
“That got me thinking about printing onto fire-retardant materials, to make fire suits lighter and more comfortable for the drivers, too,” he reflects. “We tried to sublimate onto Nomex, but the colors were not vibrant. I started looking at different printers and different printing processes and we spent years were going back and forth, trying to figure out how it could be done. In the last few years we have been able to achieve a fully printed fire suit that does not compromise its integrity or protection, giving the driver a more comfortable suit and unlimited design possibilities. I’m proud to have helped Simpson achieve that.”
Nelson’s name, along with that of his colleague, Russ Somers, is also on a 2009 patent for a seat belt that is used in recreational UTVs. He remembers, “We were going to off-road races, where we saw a lot of the racers welding their seat belt latches to the buckle or sewing the shoulder harness to the lap belt, to save time when the crew got back in after getting out to change a tire or whatever. It wasn’t safe because it threw the belt geometry off.
“On the recreational side, we observed that people were not using the sub-belt, just a four-point harness. If you’re not using the sub-belt you might as well not have seat belts at all. We looked at it from the aspect of families getting into off-road buggies, people who often had never been a race car and did not know how to use a five-point seat belt. We came up with the D3 belt, which integrated the shoulder harnesses into the lap belt, into the buckle, which put the geometry right but made it easier for somebody to put on and take off in a recreational situation.”