with small displacement generator
The Opel/Vauxhall Flextreme GT/E concept is a vehicle
which builds on the foundations of the Opel
Flextreme concept from 2007, and also helps illustrate
how extended-range electric vehicle (E-REV) systems can
be integrated into large or midsize cars.
The Flextreme GT/E shows how a hybrid
drivetrain can be integrated into a
The Flextreme GT/E's aerodynamic shape, and drag coefficient
of just 0.22, means the car can extract the highest speed
and performance possible from its electric motors. Unlike
a normal hybrid vehicle, the wheels of the Vauxhall Flextreme
GT/E are driven at all times by electricity. The E-REV
system - already developed for the Opel
Ampera - can take the Flextreme GT/E up to a top speed
of 125 mph, reach 60 mph in under 9 seconds, and offer
a battery-only range of 40 miles.
Once the system detects that the lithium-ion batteries
are becoming low, a small displacement (1.4 litre) 4 cylinder
engine kicks in to act as a generator - giving a range
of over 300 miles before refueling or recharging is required.
Average fuel consumption is estimated at 175mpg, with
CO2 emissions of less than 40g/km.
The exterior design of the Flextreme GT/E clearly shows
how the styling was somewhat dictated by a need for maximum
aerodynamic efficiency - especially when viewed from the
side. However despite these constraints, the designers
have come up with an interesting looking vehicle which
has a lot more style than most hybrid vehicles. The front
end is characterized by a series of bold lines, sharp
contours and a pair of distinctive LED headlights.
A series of measures optimise airflow management. The
21-inch alloy wheels are relatively narrow, to reduce
wind resistance, and are fitted with 195/45, low rolling
resistance tires. Clear, flush-mounted trim inserts also
minimise air turbulence.
The Flextreme GT/E also explores the potential for active
shape shifting. At speeds above 30mph, a vertical panel
extends along the body from the air extraction slot behind
each rear wheel-arch. These 350 mm-long side spoilers,
which Opel have named 'Aeroblades', guide high-speed airflow
around the rear corners of the car, further reducing the
amount of turbulence.
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