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R 47

R 47
. Data sheet
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Begin of the Production 1927
End of the Production 1928
Numbers Produced 1720
Price 1.850,- RM
Internal Designation M 51
Motor Type four-stroke two-cylinder flat-twin
Bore x Stroke 68 x 68 mm
Displacement 494 ccm
Max Power 18 hp at 4000 rpm
Compression Ratio 5.8 : 1
Valves ohv
Carburetion System 1 x carburettor,BMW Spezial two-valve 22 mm
Engine Lubricating System forced-feed lubrication
Oil Pump gear pump
Power transmission
Clutch single-plate, dry
Number of Gears 3
Shifting manual
Gearbox Ratios 2.5 / 1.50 / 1.07
Rear Wheel Ratio 1 : 4.38 (with sidecar 1 : 5.7)
Bevel / Crownwheel 13 / 57 teeth (with sidecar 10 / 57)
Electrical system
Ignition System Bosch magneto ignition
Generator magneto generator on request
Spark Plugs Bosch W 175
Designation R 47
Frame twin-loop steel tubular frame
Front Wheel Suspension plate spring, 5 laminae
Rear Wheel Suspension rigid
Wheel Rims CC 1
Tyres front 27 x 3.5 low pressure or 26 x 3 high pressure
Tyres rear 27 x 3.5 low pressure or 26 x 3 high pressure
Brakes front drum brake Ø 150 mm
Brakes rear external shoe brake at gearing (on cardan shaft)
Dimensions / Weights
Length x Width x Height 2100 x 800 x 950 mm
Wheel Base 1410 mm
Fuel Tank Capacity 14 l
Unladen Weight, Full Tank 130 kg (with original sidecar 192 kg)
Top Speed 110 kph
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