About CR05

CR05 was an evolution of CR04; focused on getting better access to the engine bay by making it wider. This also increased packaging options. Suspension design included fixing a few issues with the CR04 design that were discovered at the event. Engine wise there was a focus on improving the packaging in the rear of the car, with a focus on improving the fuel tank & radiator sizing and positioning.

CR05 is another high stiffness - low density Aluminium honeycomb composite panel based full monocoque car. The chassis was designed based on the feed backed from previous cars' torsion test results. The car uses a light weight Aprilia V twin engine with optimised intake and exhaust. Cardiff racings in house engine dynamometer illustrates higher power to weight ratio than 4 cylinder alternatives in restricted conditions. The engine power is transmitted through a student design light weight spool which recorded faster lap times than a differential in tests. A similar suspension layout as previous cars was adopted to shorten development time, with Adams simulation results being used to aid this design process.

Specifications

Body Aluminium honeycomb monocoque
Brakes Custom cast iron discs. Spool / hub mounted
Suspension Front and rear a-arm, push rod actuated
Tyres Hoosier C2000 R25B
Wheels 3 piece, custom centres
Engine Name Aprilia SXV 550 V-twin
Engine type SOHC fluid cooled two cylinder four-stoke
Engine Capacity 553 cc
Bore & Stroke 80 x 55 (mm)
Compression Ratio 12.5 : 1
Inlet Laser sintered plenum
Injection Stock injectors
Exhaust 2 into 1, stainless steel silencer
Drive Train Student designed aluminium spool
Final Drive 2.925:1

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