Williams' Vowles offers fresh insight into troubled birth of 2026 FW47

Williams team principal James Vowles has provided a detailed account of the delays and weight problems that plagued the birth of the FW47, their 2026 car. The car missed a Barcelona shakedown and failed some FIA crash tests, ultimately arriving significantly over the 768kg weight limit. Despite these issues, the team achieved its first double points finish of the season in Miami, where they kicked off a weight reduction program.

Why it matters:

Williams identified 2026 as a major opportunity under Vowles' leadership, and the car's troubled birth threatens to undermine that ambition. The team invested heavily in new processes and early wind tunnel work, but the first full build under the new system exposed hundreds of small inefficiencies that compounded. Williams was one of the earliest teams to fully commit to 2026 development, but the complexity of the new regulations exposed weaknesses in their planning software.

The details:

• The FW47 missed a planned Barcelona shakedown due to delays and multiple FIA crash test failures.
• The car is significantly overweight, directly impacting performance.
• Vowles described the build as "the most complex" ever for Williams, with twice the number of parts and 1.5 to 2 times the manufacturing time.
• The team began its weight reduction program at the Miami GP, where Alex Albon and Carlos Sainz finished ninth and tenth for three combined points.
• Vowles cited "hundreds of tiny, small details" in planning software and processes that only became apparent under stress.
• When delays hit, Williams had few alternatives as external manufacturers were fully booked, forcing them to add weight to expedite parts.

What's next:

With weight reduction already underway, Williams aims to claw back performance as the season progresses. The double points in Miami show potential, but the team acknowledges the car's current handicap. Vowles emphasized that while the build process didn't go smoothly, the lessons learned will benefit future designs under the new regulations.