R47
Start of Production | 1927 |
Click to View Available Literature |
End of Production | 1928 | |
Numbers Produced | 1,720 | |
Price | 1,850 RM | |
Engine |
| |
Internal Designation | M 51 | |
Motor Type | Four-stroke two cylinder flat twin | |
Bore x Stroke | 68 x 68 mm (2.67 x 2.67 in) | |
Displacement | 494 cc | |
Max Power | 18 hp at 4,000 rpm | |
Compression Ratio | 5.8 : 1 | |
Valves | OHV | |
Carburation System | 1 carburettor, Type BMW Spezial 2 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 | 2.50 / 1.50 / 1.07 | |
Rear Wheel Ratio | 1 : 4.38 (1 : 5.7 with sidecar) | |
Bevel/Crownwheel | 13 / 57 teeth (10 / 57 with sidecar) | |
Electrical System |
| |
Ignition System | Bosch magneto ignition | |
Generator | Magneto generator on request | |
Spark Plugs | Bosch W 175 | |
Chassis |
| |
Designation | R47 | |
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 150 mm / 5.90 in diameter | |
Brakes, Rear | External shoe brake at the gearing on Cardan shaft | |
Dimensions / Weights |
| |
Length x Width x Height | 2100 x 800 x 950 mm (82.67 x 31.49 x 37.40 in) | |
Wheel Base | 1410 mm / 55.51 in | |
Fuel Tank Capacity | 14 litres / 3.07 gal / 3.69 gal US | |
Unladen Weight with Full Tank | 130 Kg / 286 lb (192 Kg / 422 lb with original sidecar) | |
Top Speed | 110 Kph / 68 mph | |
Information kindly supplied by P.Hawksley