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Fairthorpe Atom Mark I

(1955 model)

Brief specs of 1955 Fairthorpe Atom Mark I

2-door 2-seater fixed-head coupé, petrol (gasoline) 1-cylinder 2-valve single cylinder engine, OHV (overhead valve, I-head), 248 cm3 / 15.1 cu in / 15.1 cu in, 8.9 kW / 11.9 hp / 11.9 hp @ 5300 rpm / 5300 rpm / 5300 rpm, 19.0 N·m / 14.0 lb·ft / 14.0 lb·ft @ 3700 rpm / 3700 rpm / 3700 rpm, manual 3-speed transmission, rear wheel drive

units: metric UK US

Basic (general) data

Marque (make)FairthorpeIssued from1955
ModelAtom Mark IIssued until
SerieAtomNumber made
Model familyBody construction
Model codeBody designation
ManufacturerFairthorpeCountryUK

Bodywork

Base platformNumber of doors2
Bodywork typefixed-head coupéNumber of seats2
Bodywork designerCargo capacity (volume)
Passenger space (volume)Max. cargo capacity (volume)

Dimensions & Weight

Length3658 mm / 144.0 in / 144.0 inTotal (curb) weight426 kg / 939 lb / 939 lb
Width1524 mm / 60.0 in / 60.0 inDry weight
Height1372 mm / 54.0 in / 54.0 inLoad capacity
Wheelbase2261 mm / 89.0 in / 89.0 inGross (max.) weight
Track front1143 mm / 45.0 in / 45.0 inTowing weight
Track rear1219 mm / 48.0 in / 48.0 inWeight distribution (front)
Ground clearance191 mm / 7.5 in / 7.5 inFuel capacity18 l / 4.0 UK gal / 4.8 US gal
Length/wheelbase ratio1.62  

Aerodynamics

Drag coefficient (Cd, Cx, Cw)Frontal area (A)1.78 m2 / 19.1 sq ft / 19.1 sq ft (est.)
Aerodynamic coefficient (Cd×A)Aerodynamic resistance (Aero horse power) at 100 km/h (62 mph)

Engine

Engine CodeTotal number of cylinders1
Engine Typesingle cylinder Total number of valves2
Engine ManufacturerValves per cylinder2
Engine constructionBore63.0 mm / 2.48 in / 2.48 in
Fuelpetrol (gasoline)Stroke80.0 mm / 3.15 in / 3.15 in
Fuel detailsBore/Stroke ratio0.79
Fuel supply1 Am carbEngine displacement248 cm3 / 15.1 cu in / 15.1 cu in
Engine Main bearingsUnitary capacity248.00 cm3/cylinder / 15.134 cu in/cylinder / 15.134 cu in/cylinder
Cam DesignOHV (overhead valve, I-head)Compression ratio6.5 : 1
SumpMax. output power8.9 kW / 11.9 hp / 11.9 hp at 5300 rpm / 5300 rpm / 5300 rpm
AspirationnaturalMax. torque19.0 N·m / 14.0 lb·ft / 14.0 lb·ft at 3700 rpm / 3700 rpm / 3700 rpm
Compressor typeN/AMaximum rpm
IntercoolernoMax. net output (power at the wheels)3.6 kW / 4.8 hp / 4.8 hp (est.)
CoolantairSpecific output35.9 kW/l / 0.789 bhp/cu in / 0.789 bhp/cu in
Catalytic converternoSpecific torque76.6 N·m/l / 0.67 lb·ft/cu in / 0.67 lb·ft/cu in

Transmission

Transmission typemanualNumber of gears3
Wheel driverear wheel driveTop gear (drive) ratio1
  Final gear (drive) ratio7.98

Performance

Acceleration 0-50 mph (80 km/h)Top (maximal) speed
Acceleration 0-60 mph (97 km/h)Power-to-weight ratio28.2 kW/ton / 21.3 bhp/ton / 21.3 bhp/ton
Acceleration 0-100 km/hFuel consumption, City (urban)
Acceleration 0-100 mph (160 km/h)Fuel consumption, Road (extra-urban)
Acceleration 80-120 km/h (50-70 mph) in topFuel consumption, Mixed (combined)
Standing ¼mile time Fuel consumption, Euro
Standing kilometer time CO2 emissions
  Range

Chassis

Engine locationrearEngine alignment
SteeringSteering details
Turns lock-to-lockTurning circle
Suspension frontIndependent, Coil springsSuspension rearIndependent, Coil springs
Wheels frontWheels rear
Tyres frontTyres rear
Brakes frontdrumBrakes reardrum
Brake diameter frontBrake diameter rear
Brakes detailsBraked area

Technical specifications and performance data of Fairthorpe Atom Mark I

Infobox

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