TRUCKS SPOILERS // AERODYNAMIC

WHY DOES A VEHICLE CONSUME ENERGY ?

ENERGY = FUEL = COST

The power released by the engine to maintain a speed must balance a certain number forces which tend a slow down the vehicle.

Some are well-known: the tyres rubbing and being flattened under the load, the rubbing together of mechanical parts in the engine itself, the gearbox, the differential, the hubs, etc.…

Air resistance is the least well-known and often forgotten. The most common preconceived idea is that aerodynamics is only important for fast cars, or calculations and tests (in wind-tunnels or on roads) which facilitate a precise evaluation of this resistance.

For a 38-ton HGV moving at 80 kph, about half the power, and thus the consumption, is used to flight air resistance.

If the speed increases by 10%, the aerodynamic drag increases by 20%.

The slightest gain of drag induces a considerable fuel saving.

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