TECH SPEC Dome S102
Class: ACO LMP1 2008 (updated to 2011 specifi cations)
Chassis: Dome Carbon Magic composite monocoque coupe
Engine : Judd GV5, 5,496cc normally aspirated gasoline V8.
Suspension: Double wishbone front and rear with pushrod actuated dampers
Brakes: Carbon ceramic
Transmission: Xtrac 6 speed sequential gearbox Electronics: Dome / Cosworth Tyres: Michelin LMP1 Weight: 900kg
Dimensions: Length: 4650mm Width: 1995mm Height: 920mm Wheelbase: 2900mm
“if someone came along with enough money we could go racing”
concepts, developed in two wind tunnels over three years. Interestingly, the two tunnels were different scales. ‘It was easier to change the shape of the model quickly with the quarter-scale tunnel. We could test concepts like the separated fenders, and fi x the general shape of the car that way,’ Yuchi reveals. The quarter-scale model was also critical in making the choice between an open car and
the lower drag coupe. ‘With the 60 per cent scale model you need to use a sting attached to the top to support the model in the tunnel, and that interferes with the area you are looking at, but with the quarter-scale model we just use a wire. We found that on paper there was not much between the two concepts. If you did very well with an open car you could get to within 0.5 per cent of the effi ciency of a
closed car, but at Le Mans 0.5 per cent is huge!’ The choice to build a coupe was further infl uenced by the limited range of engines available to the project. The popular 5.5-litre Judd V10 was chosen, but it was no match for the works’ diesel and petrol engines. Instead, the emphasis was placed on aerodynamic effi ciency, and there the larger wind tunnel programme came into play.
Using its well-regarded, on-site ‘Furyusha ‘tunnel, Yuchi’s team started to hone the S102’s shape at 60 per cent scale. ‘Once we had fi xed the shape
we switched to the large tunnel. The small scale had allowed us to see trends, but you need a larger tunnel to do better detail. You can also be more accurate with a larger model. The repeatability of the data from the quarter-scale model could be plus or minus 0.3
Le Mans •
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