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The bodywork of the 2026 car on its stand in the paint booth, white with black stripes

Subsystem 05 of 13

Chassis

A full carbon fibre monocoque with a planar design, infused and cured in a single stage. It carries every other subsystem and sets the suspension and drivetrain geometry; for WFR26-E it was refined for rules compliance, rear stiffness and a faster build.

Our capabilities

Construction
Full CFRP monocoque, single stage infusion
Torsional stiffness
3300 N·m/deg measured (2900 targeted)
Front roll hoop
Interlaminar
Hardpoints
Minimum factor of safety 2

Chassis

Light weight. Heavy performance.

The black faceted carbon monocoque on a stand in the workshop, its front suspension arms fitted, under the Western Formula Racing sign
  1. 01

    Integrated Accumulator Mounting Flange

    Allows for an ergonomic battery installation/removal procedure, has a self- aligning feature for ease of installation and maximizes access to the enclosed rear frame

  2. 02

    Faceted Primary Structure

    Streamlined core manufacturing, a hardpoint iteration possible without major redesign, and a unique planar aesthetic extending to the rest of the vehicle

  3. 03

    Interlaminar Aluminum Front Roll Hoop

    No additional mounting components required, lighter material composition compared to steel, and aesthetic laminate integration

The black faceted carbon monocoque on a stand in the workshop, its front suspension arms fitted, under the Western Formula Racing sign

WFR26E

The assembly

Drag to turn

Changing for 2027

Redesigned carbon fibre monocoque
Fibreglass moulds in place of MDF moulds
Rear frame repackaged for the new battery pack and chain drive
New layup methodology
The finished white, black and gold bodywork of the 2026 car on the shop bench

In the making

How it works

The WFR26-E chassis is a full planar carbon fibre monocoque, designed to meet the structural equivalency rules while staying stiff, light and quick to build, so the car could be finished early enough to test.

The roll hoop and front hoop were adjusted this season after a rules review, the rear frame was widened to package the battery pack and its high voltage routing behind the firewall, and the firewall was burn tested.

That figure is not set by the hardpoints: the monocoque's torsional stiffness comes entirely from its laminate layup and geometry, while hardpoint stiffness affects the torsional stiffness of the vehicle as a whole system. Every hardpoint was checked by hand for pull-out, compressive and bearing failure, with a minimum factor of safety of 2.

Rohacell foam cores and I-beam style shear webs sit between the carbon skins, and the moulds are modified and reused year to year rather than remade.

The team has built eight generations of the carbon tub since 2019, and the lightest came in at 25 kg for the primary structure.

The 2010 monocoque study that benchmarked it argued for carbon; the team got there in 2015 and has not gone back.

The tub is resin-infused in a single cure cycle, with an aluminium impact attenuator ahead of it rated to 2000 J over a 205 mm crush zone.

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WFR26E, car 105, side-on on a stone plaza in front of stone steps, a team member standing behind it

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