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{{DISPLAYTITLE:{{PAGENAME}}: history, specs, pictures}}
[[Image:1927-BMW-R47.jpg|left|thumb|1927 BMW R47]]
[[Image:R47.jpg|thumb|350px|BMW R47]]
[[BMW]]'s first sports model, the [[BMW R37|BMW R37]], appeared in 1924, joining the original [[BMW R32|BMW R32]] tourer. The [[BMW R37|BMW R37]] boasted a new overhead-valve engine producing 16bhp, almost double the R32's power output, but was produced for little more than a year before being replaced by the improved [[BMW|BMW]]R47. The latter was introduced in 1926 alongside the sidevalve-engined R42 tourer, both models benefiting from a redesigned and more powerful engine boasting detachable alloy cylinder heads and cooling fins set at 90 degrees to the cylinder axis. The engine was set further back in the duplex loop frame, which improved weight distribution and enabled straight front down-tubes to be used. The braking too came in for attention: the old block-and-pulley type rear brake being replaced by a drum on the driveshaft gripped by external contracting bands. Electric lighting was still regarded as an 'extra' and would not be standardised until 1928. Maximum power output of the R47 was 18bhp and its top speed in the region of 70mph (113km/h). R47 production lasted for just two years, 1,720 machines being sold.
{{BMW}}
[[Category:BMW motorcycles|R47, BMW]]
[[Category:BMW R series]]
{{Motorcycle
{{Motorcycle
|name            = BMW R47
|name            = '''BMW R47'''
|photo=bmw-r-47-1928-1928-1.jpg
|photo= 1927-BMW-R47.jpg
|aka              =  
|aka              =  
|manufacturer    = BMW
|manufacturer    = [[BMW]]
|parent_company  =
|parent_company  =
|production      = 1928
|production      = 1927 - 1928
|model_year      =
|model_year      =
|predecessor      =
|predecessor      =
|successor        =
|successor        =
|class            = Classic
|class            =
|engine          = air-cooled, four-stroke, boxer twin cylinder, OHV
|engine          = two cylinder boxer, four-stroke
|bore_stroke      = 68.6mm x 68.6mm
|bore_stroke      = 68.0mm x 68.0mm
|compression      = 5.8:1
|compression      =
|top_speed        = 68 mph (110 km/h)
|top_speed        = 68 mph (110 km/h)
|power            = 17.57 HP (13.1 KW) @ 4000RPM
|power            = 17.57 HP (13.1 KW) @ 4000RPM
|torque          =
|torque          =
|ignition        =
|fuel_system      = carburetor. 20mm bmw spezial
|ignition        = bosh magneto
|spark_plug      =
|spark_plug      =
|battery          =
|battery          =  
|transmission    = Gear box: 3 speed, manual <br>
|transmission    = Gear box: 3-speed <br>
Clutch: dry, single plate <br>
Final Drive: [[shaft drive]] (cardan) <br>
|final_drive      = [[shaft drive]] (cardan)  
Clutch: dry-single plate-cable operated <br>
 
|frame            =
|frame            =
|suspension      =Front: plate spring, 5 laminae <br>
|suspension      =Front: leading link <br>
Rear: hard-tail, sprung seat
Rear: rigid
|brakes          =Front: 150mm drum <br>Rear: external shoe [[brake]] at the gearing (on cardan shaft)
|brakes          =Front: expanding [[brake]] (drum brake) <br>
|front_tire      = {{tire|27 x 3.5}}  
|front_tire      = {{tire|3.50-27}}  
|rear_tire    = {{tire|27 x 3.5}}  
|rear_tire    = {{tire|3.50-27}}  
|rake_trail      =
|rake_trail      =
|wheelbase        = 55.51 inches (1410 mm)
|wheelbase        = 55.51 inches (1410 mm)
|length          = 82.68 inches (2100 mm)
|length          = 82.68 inches (2100 mm)
|width            = 30.98 inches (787 mm)
|width            = 31.5 inches (800 mm)
|height          = 37.4 inches (950 mm)
|height          = 37.4 inches (950 mm)
|seat_height      =
|seat_height      =
|dry_weight      =
|dry_weight      =
|wet_weight      = 130.0 kg
|wet_weight      = 126.0 kg
|fuel_capacity    = 3.7 Gallon (14.00 Liters)
|fuel_capacity    = 3.7 Gallon (14.00 Liters)
|oil_capacity    =
|oil_capacity    =
|fuel_consumption =
|fuel_consumption = 3.00 liters/100 km (33.3 km/l or 78.41 mpg)
|turning_radius  =
|turning_radius  =
|related          =
|related          =
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}}
}}


The '''[[BMW]] R 47''' was a air-cooled, four-stroke, boxer twin cylinder, OHV Classic [[motorcycle]] produced by [[BMW]] in 1928. Claimed [[horsepower]] was 17.97 HP (13.4 KW) @ 4000 RPM.   
The '''[[BMW]] R47''' was a two cylinder boxer, [[four-stroke]] standard produced by [[BMW]] between 1927 and 1928. It could reach a top speed of 68 mph (110 km/h). Claimed [[horsepower]] was 17.57 HP (13.1 KW) @ 4000 RPM.   
 
 
[[Image:1927-BMW-R47.jpg|left|thumb|1927 BMW R47]]
[[Image:R47.jpg|thumb|350px|BMW R47]]
[[BMW]]'s first sports model, the [[BMW R37|BMW R37]], appeared in 1924, joining the original [[BMW R32|BMW R32]] tourer. The [[BMW R37|BMW R37]] boasted a new overhead-valve engine producing 16bhp, almost double the R32's power output, but was produced for little more than a year before being replaced by the improved [[BMW|BMW]]R47. The latter was introduced in 1926 alongside the sidevalve-engined R42 tourer, both models benefiting from a redesigned and more powerful engine boasting detachable alloy cylinder heads and cooling fins set at 90 degrees to the cylinder axis. The engine was set further back in the duplex loop frame, which improved weight distribution and enabled straight front down-tubes to be used. The braking too came in for attention: the old block-and-pulley type rear brake being replaced by a drum on the driveshaft gripped by external contracting bands. Electric lighting was still regarded as an 'extra' and would not be standardised until 1928. Maximum power output of the R47 was 18bhp and its top speed in the region of 70mph (113km/h). R47 production lasted for just two years, 1,720 machines being sold.


==Engine==
==Engine==
A 68.6mm [[bore]] x 68.6mm [[stroke]] result in a [[displacement]] of just 494.0 cubic centimeters.   
The engine was a [[air cooled]] two cylinder boxer, four-stroke. A 68.0mm [[bore]] x 68.0mm [[stroke]] result in a [[displacement]] of just 494.0 cubic centimeters. Fuel was supplied via a overhead valves (ohv).   


==Drive==
==Drive==
The bike has a 3 speed, manual transmission. Power was moderated via the dry, single plate.   
The bike has a 3-speed transmission. Power was moderated via the dry-single plate-cable operated.   


==Chassis==
==Chassis==
It came with a 27 x 3.5 front [[tire]] and a 27 x 3.5 rear tire. Stopping was achieved via 150mm drum in the front and a external shoe brake at the gearing (on cardan shaft) in the rear. The front suspension was a  plate spring, 5 laminae while the rear was equipped with a hard-tail, sprung seat. The wheelbase was 55.51 inches (1410 mm) long.   
It came with a 3.50-27 front [[tire]] and a 3.50-27 rear tire. The front suspension was a  leading link while the rear was equipped with a rigid. The R47 was fitted with a 3.7 Gallon (14.00 Liters) fuel tank. The wheelbase was 55.51 inches (1410 mm) long.   
 
[[Category:standard motorcycles]]
==1928 BMW R 47==
[[Category:BMW motorcycles]]
<gallery mode='packed-hover'>
[[Category:1920s motorcycles]]
File:bmw-r-47-1928-1928-1.jpg|600px|1928 BMW R 47
File:bmw-r-47-1928-1928-0.jpg|600px|1928 BMW R 47
</gallery>
 
The House of Munich has launched the 1927 R 47 with an air-cooled, four-stroke, 494cc, boxer twin cylinder powerplant mated to a three-speed manual transmission, that could produce a claimed 18 horsepower at 4000 rpm. It comes with a front drum brake, a plate spring fork, a hard-tail rear suspension, a single sprung seat, a rear luggage rack, pull-back handlebars, laced wheels, long fenders, and a small luggage rack in the front.
 
 
{{BMW}}
 
[[Category:BMW motorcycles|R47, BMW]]
[[Category:BMW R series]]

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