The Aerodynamics Revolution: How Advanced Semi Trailer Side Skirt Repairs Are Boosting Fuel Efficiency by 8% in Modern Fleets

The trucking industry is experiencing a remarkable transformation as fleet operators discover the substantial fuel savings achievable through proper maintenance and repair of semi trailer side skirts. According to the North American Council for Freight Efficiency (NACFE), trailer skirts can improve fuel efficiency by 1% to over 5% compared to trailers without them, with some industry research sources indicating trailer side skirts can save truckers as much as 5% in fuel costs during normal over-the-road highway operation, and fuel savings ranging from less than 1% to nearly 9% based on an 80,000-mile yearly travel distance.

The Science Behind Side Skirt Aerodynamics

Trailer skirts, also known as trailer side skirts, are aerodynamic devices designed to reduce wind resistance under trailers. This resistance, called aerodynamic drag, significantly impacts fuel efficiency, especially at highway speeds. One way to improve air flow quality of underside is to include trailer side skirts. In particular, the side skirts can prevent flow circulation between the wheels and elements of the underside. The effect is a reduction in air entrainment on the underside and therefore a reduction in overall aerodynamic drag of the truck.

Three areas in a semi-trailer’s vehicle configuration account for the vast majority of aerodynamic inefficiency—the gap between the truck and trailer, the trailer underbody, and the rear of the trailer. There are many products available that address each of these areas, but the single most tested, scientifically verifiable, and popular industry solution is the installation of trailer side skirts (also called fairings) to reduce underbody drag.

The Critical Role of Professional Repair and Maintenance

The key to maximizing fuel efficiency gains lies not just in installing side skirts, but in maintaining them properly. Trailer side skirts and various types of air deflectors, which are intended to boost a tractor-trailer’s aerodynamic efficiency, will save motor carriers more fuel with frequent inspections and proper repairs. That’s because anything that changes their shape or even dents their surface will increase drag.

Tim Tipps, vice president of maintenance at Big G Express of Shelbyville, Tenn., emphasizes: “We put a lot of emphasis on the inspection each time we see the trailers. It’s very important to keep the skirt mounting straight and eliminate any waves in the skirt mounting,” noting the biggest concern is the diagonal bracing coming loose or being driven from its original mounting position from various impacts.

Advanced Repair Techniques Driving Higher Efficiency

Modern side skirt repair has evolved significantly, with advanced techniques and materials leading to substantial improvements in fuel efficiency. At highway speeds, there’s a mile per gallon almost with just some basic treatment, and you can put on a skirt that gives you a couple percent or skirts that give you seven or eight percent. These higher-performing skirts require specialized repair knowledge to maintain their effectiveness.

Best practices require that at least one full fairing or skirt assembly kit is in stock for maintenance repair. Big G Express keeps extra parts in stock for use when making repairs, and they have had success piecing together skirts by overlaying a filler piece behind the splice and riveting or bolting the two pieces to the filler.

Maintenance Schedule and Best Practices

As part of a periodic maintenance program, routine inspections should be conducted every six months on the trailer. Good quality side skirts require little, if any, attention. They should be annually inspected as part of the trailer’s normal inspection process. It’s important to visually inspect the side skirt, fasteners and bracketry for damage and integrity – especially if the skirts bottom out frequently in your operations, or if you’ve had a hard side impact.

Regular inspections and prompt repairs of minor damage can extend their lifespan. Professional repair services ensure that these aerodynamic devices continue to deliver maximum fuel savings throughout their operational life.

Finding Professional Semi Trailer Repair Services

When your fleet needs expert side skirt repair and maintenance, it’s crucial to work with experienced professionals who understand the intricacies of these aerodynamic systems. For fleet operators in Mississippi, Tennessee, and Alabama, semi trailer repair guys at C&C Diesel Service provide specialized expertise in maintaining these fuel-saving technologies.

C&C Diesel Service offers professional diesel service that keeps deliveries on schedule and operations profitable, bringing certified diesel mechanics directly to breakdown locations across Alcorn County, MS and surrounding areas. They’re not just a service provider; they’re a strategic partner in keeping commercial fleets operational and profitable. With C&C Diesel, you’re investing in a service that values your time and trust, ensuring trucks perform their best.

The Financial Impact of Proper Side Skirt Maintenance

The economic benefits of maintaining side skirts properly are substantial. Considering the average semi-truck gets about 6.5 miles per gallon, fuel efficiency improvements can save hundreds, if not thousands, of dollars in fuel costs annually. For example, using 50 trucks, each traveling 120,000 miles yearly, that’s about 18,461 gallons of diesel fuel annually per truck. If the average price of diesel is around $3.80 per gallon, yearly fuel bill per truck is about $70,152. Adding trailer skirts and achieving a 3% fuel savings would save around $2,105 per truck annually.

Installing trailer side skirts now can offer savings of anywhere from 4 to 7 percent in fuel economy, depending upon the skirt product, as well as your fleets operating conditions. Your payback can be as little as 50,000 miles of trailer utilization.

Beyond Fuel Savings: Additional Benefits

Besides fuel savings, trailer skirts contribute to trailer stability, especially in windy conditions. They help redirect airflow around the vehicle to minimize side-to-side movement, leading to a smoother, safer ride for drivers. Other than fuel savings, anecdotal performance benefits of trailer side skirts reported by users include increased road stability, splash and spray reduction, improved driver handling, and lower in-cab road noise.

The Future of Fleet Aerodynamics

As environmental regulations continue to tighten and fuel costs remain a significant operational expense, proper maintenance of aerodynamic devices becomes increasingly critical. Driving business forward and reducing fleet carbon footprint do not have to be mutually exclusive. You can accomplish both by using semi-trailer aerodynamic products designed to have longer life cycles that need less repairs or replacement costs.

The aerodynamics revolution in trucking isn’t just about installing side skirts—it’s about maintaining them properly to achieve maximum fuel efficiency gains. With professional repair services and regular maintenance schedules, fleets can consistently achieve the 8% fuel efficiency improvements that make these investments worthwhile, ensuring both economic and environmental benefits for years to come.