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Fairthorpe Atom Mark III

(1955 model)

Brief specs of 1955 Fairthorpe Atom Mark III

2-door 2-seater fixed-head coupé, petrol (gasoline) 2-cylinder 4-valve straight (inline) engine, OHV (overhead valve, I-head), 646 cm3 / 39.4 cu in / 39.4 cu in, 26.1 kW / 35.0 hp / 35.0 hp @ 5700 rpm / 5700 rpm / 5700 rpm, 49.0 N·m / 36.1 lb·ft / 36.1 lb·ft @ 3750 rpm / 3750 rpm / 3750 rpm, manual 3-speed transmission, rear wheel drive

units: metric UK US

Basic (general) data

Marque (make)FairthorpeIssued from1955
ModelAtom Mark IIIIssued 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) weight431 kg / 950 lb / 950 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 capacity20 l / 4.5 UK gal / 5.4 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 cylinders2
Engine Typestraight (inline) (Inline, 2 cylinder (twin))Total number of valves4
Engine ManufacturerBSAValves per cylinder2
Engine constructionBore70.0 mm / 2.76 in / 2.76 in
Fuelpetrol (gasoline)Stroke84.0 mm / 3.31 in / 3.31 in
Fuel detailsBore/Stroke ratio0.83
Fuel supply1 Am carbEngine displacement646 cm3 / 39.4 cu in / 39.4 cu in
Engine Main bearingsUnitary capacity323.00 cm3/cylinder / 19.711 cu in/cylinder / 19.711 cu in/cylinder
Cam DesignOHV (overhead valve, I-head)Compression ratio6.5 : 1
SumpMax. output power26.1 kW / 35.0 hp / 35.0 hp at 5700 rpm / 5700 rpm / 5700 rpm
AspirationnaturalMax. torque49.0 N·m / 36.1 lb·ft / 36.1 lb·ft at 3750 rpm / 3750 rpm / 3750 rpm
Compressor typeN/AMaximum rpm
IntercoolernoMax. net output (power at the wheels)10.4 kW / 14.0 hp / 14.0 hp (est.)
CoolantairSpecific output40.4 kW/l / 0.888 bhp/cu in / 0.888 bhp/cu in
Catalytic converternoSpecific torque75.8 N·m/l / 0.66 lb·ft/cu in / 0.66 lb·ft/cu in

Transmission

Transmission typemanualNumber of gears3
Wheel driverear wheel driveTop gear (drive) ratio1
  Final gear (drive) ratio4.9

Performance

Acceleration 0-50 mph (80 km/h)Top (maximal) speed
Acceleration 0-60 mph (97 km/h)Power-to-weight ratio81.2 kW/ton / 61.5 bhp/ton / 61.5 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 III

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