Teardrop Aerodynamic Trailers were invented by Don-Bur in 2006 as a step change in articulated trailer design. The patented curved roof profile redefined how aerodynamic drag is managed on commercial trailers and established the Don-Bur "Teardrop" as the original aerodynamic trailer concept in the UK market.
The design delivers an independently verified average fuel saving of 11.3%, calculated from multiple controlled trials under comparable operating conditions. Importantly, this efficiency gain is achieved without reducing load capacity: a standard 13.6m trailer retains full 26 UK pallet capability.
The Teardrop programme demonstrated that aerodynamic optimisation of the trailer body – not just the tractive unit – materially reduces drag at motorway speeds, where aerodynamic resistance is the dominant operating force. The innovation attracted national recognition for British engineering, including an invitation to 10 Downing Street.
- Invented in 2006 – original aerodynamic trailer concept
- 11.3% average verified fuel reduction
- Full 26 pallet capacity maintained
- Patented and design-protected concept
Origins of the Teardrop Concept
Aerodynamic optimisation in road vehicles is not new. As early as 1921, the Rumpler Tropfenwagen (often referred to as the "Tropfenauto" or "Teardrop car") demonstrated how a water-droplet profile could significantly reduce drag compared to conventional upright body shapes.
Modern vehicles continue to refine this approach. Highly aerodynamic cars such as the Mercedes-Benz EQS and Tesla Model S achieve extremely low drag coefficients through careful control of roof curvature, airflow attachment and wake management.
Introduced in 2006, the Teardrop applied these established aerodynamic principles to articulated commercial trailers — a sector that had seen limited body-shape evolution despite operating predominantly at motorway speeds where aerodynamic resistance is the dominant force.
The curved roof profile reflects the same natural drag-minimising characteristics of a water droplet, reducing airflow separation and rear wake formation while maintaining practical loading geometry and full 26-pallet capacity.
Why Standard Box Trailers Create Drag
Conventional box trailers generate significant aerodynamic drag due to abrupt geometry.
Flat frontal surfaces create high pressure zones. At the rear, sharp edges promote airflow separation and the formation of a low-pressure wake. This pressure differential increases resistance and requires greater engine power to maintain cruising speed.
At motorway speeds, aerodynamic resistance becomes the dominant operating load. Increased drag directly increases fuel consumption and associated emissions.
How the Teardrop Reduces Drag
The Teardrop roofline reduces airflow separation along the trailer length and minimises rear turbulence.
By encouraging attached airflow and managing wake formation, overall aerodynamic resistance is lowered. Reduced drag decreases the power required from the engine at cruising speed, producing measurable fuel savings without altering payload capability.
Fuel Savings – Proven Performance
Operators using Teardrop Aerodynamic Trailers achieve an average verified fuel reduction of 11.3% under comparable operating conditions.
Independent trials across different fleet operations confirm that aerodynamic optimisation of the trailer body produces consistent efficiency improvements at motorway speeds.
Load Capacity and Rear Aperture
A standard 13.6m Teardrop trailer retains full 26 UK pallet capacity. Internal volume is preserved through controlled roof curvature and rear chassis configuration.
The rear chassis can be lowered to maintain practical loading height while allowing the roofline to taper for aerodynamic efficiency. This ensures operational compatibility with standard loading bays and distribution requirements.
Fuel Efficiency and Measurable Emissions Reduction
Fuel consumption and CO2 emissions are directly linked. Each litre of diesel burned produces approximately 2.63 kg of CO2.
Operators achieving a 10–11% fuel reduction through aerodynamic optimisation benefit from immediate operating cost savings. The associated reduction in CO2 emissions is a direct and measurable consequence of improved efficiency.
For fleets covering high annual mileages, percentage improvements translate into substantial aggregate fuel and emissions reductions per vehicle.
M&S "Plan A" Teardrop Trailer
The original high-profile deployment of the Teardrop Aerodynamic Trailer was a unique and distinctive Marks & Spencer "Plan A" trailer.
This vehicle provided early real-world validation of the Teardrop concept on national distribution routes. Its distinctive black livery and environmental positioning brought aerodynamic trailer design into the mainstream logistics conversation.
Operated by DHL Excel Supply Chain for 3 months, the trial recorded a 10.14% overall fuel saving.
Following the trial, M&S acquired exclusivity for the supply of Teardrop trailers for 12 months.
Intellectual Property Protection
The Teardrop concept is protected by active intellectual property rights:
- Patents: GB2443035 and GB2474379
- Community Registered Designs: 000867593-0001, 000709423-0002 and 000709423-0001
360 Viewer
Take a virtual walk around an example design in our 360 panoramic viewer.
Scene menu buttons on the left of the viewer window allow you to navigate around the trailer to look at specific features.
Image gallery
Indicative pricing & availability
Price: P.O.A.
Available to pre-order
