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((More citations needed|date=March 2019))
((Infobox automobile
| name=Nesselsdorfer Wagenbau-Fabriks-Gesellschaft Rennzweier
| manufacturer=((Lang|de|Nesselsdorfer Wagenbau-Fabriks-Gesellschaft))<br>''today [[Tatra (company)|Tatra]]''
| production=1900
| assembly=[[Kopřivnice|Nesselsdorf]], [[Margraviate of Moravia]], [[Cisleithania]]
| predecessor=[[Präsident]]
| successor=
| image=1900_NW_12_HP_Rennzweier_pic1.JPG
| class=[[Auto racing|Race car]]
| platform=
| transmission=4-speed<ref name="Vojtěch">((
Cite web
| access-date=2023-09-11
| first=Vojtěch
| language=cs
| last=Kučírek
| page=18
| title=KATALOG ZNÁMEK : ČESKÁ REPUBLIKA : 1993 - 2001
| url=https://is.muni.cz/www/p.kucirek/7518077/Katalog_znamek_2008.pdf
))</ref>
| layout=[[Rear mid-engine, rear-wheel-drive layout|MR layout]]
| body_style=[[Runabout (car)|Runabout]]
| engine=((Cvt|4250|cc)) ((Cvt|130|x|160|mm)) [[Stroke ratio|bore/stroke]]<ref name="Margolius Henry 2015 p. 211">((
Cite book
| first1=Ivan
| first2=John G.
| isbn=978-1-84584-799-9
| last1=Margolius
| last2=Henry
| oclc=973620118
| page=211
| publication-place=Dorchester
| publisher=Veloce
| title=Tatra : the legacy of Hans Ledwinka
| url=((Google Books URL | 1=mYK_CwAAQBAJ | p=211))
| year=2015
))</ref> [[Water cooling|water-cooled]] [[Flat-twin engine#Automobiles|flat-twin]] [[Carl Benz#Benz and Cie. expansion|Benz]]<ref name="Dragoun 1996">((
Cite web
| access-date=2023-09-11
| archive-date=2015-02-25
| archive-url=https://web.archive.org/web/20150225060249/http://sleeper.ic.cz/AN/C2/Nwrenn2er.pdf
| date=1996-10-02
| first=Aleš
| language=cs
| last=Dragoun
| title=NW Rennzweier (1900)
| url-status=dead
| url=http://sleeper.ic.cz/AN/C2/Nwrenn2er.pdf
| website=sleeper.ic.cz
))</ref>
| powerout=((Cvt|12|hp)) at ((Val | 1=650 | ul=rpm))<ref name="K 1975">((
Cite magazine
| date=1975
| first=S
| language=cs
| last=K
| magazine=Svět motorů
| number=52
| pages=15–17
| title=náš první závodní automobil 'NW RENNZWEIER'
| url=https://www.tatraportal.sk/?ukaz=data/clanky/rennzweier
| volume=29
))</ref>
| wheelbase=((Cvt|1850|mm))
| length=
| width=((Cvt|1375|mm)) 
| height=
| weight=((Cvt|975|kg))
| designer=
))

The Double Racer (((lang-de|'''Rennzweier'''))) is a [[Auto racing|race car]] manufactured by the ((Lang|de|Nesselsdorfer Wagenbau-Fabriksgesellschaft)) ('''NW'''), now [[Tatra (company)|Tatra]], in 1900. It is sometimes also called ''First Racing'', ''12 HP'', or ''Race Car'' (((lang-de|Rennwagen))). It was commissioned by Baron ((ill|Theodor von Liebieg|cs)). [[Hans Ledwinka]], the man behind the famous rear-engined Tatras, and at the time only 20 years old, helped in the production of the car. The car was designed and built in a five week period in April and May 1900. The Rennzweier was the first car designed specifically for racing to be built in [[Central Europe]].<ref name="Dragoun 1996" />

In 1994, a 2 [[Czech koruna|Kč]] commemorative stamp featuring the Rennzweier, designed by ((ill|Bedřich Housa|cs)), was issued.<ref>((
Cite thesis
| access-date=2023-09-11
| date=October 2013
| degree=PhD
| doi=10.2870/362043
| first=Henio Pablo Luis
| institution=European University Institute
| last=Hoyo Prohuber
| oclc=1280489511
| page=116
| publication-place=Florence
| quote=Czech Republic, 1994: 1900 NW (‘Rennzweier’) [Scott, Czechoslovakia 2932]
| title=Post-nationalism : postage stamps as carriers of national imaginaries
| hdl=1814/29627
| url=https://hdl.handle.net/1814/29627
))</ref><ref>((
Cite web
| access-date=2023-09-11
| title=Česká pošta
| url=https://www.postaonline.cz/eshopfilatelie/detailProduct.html?id=823
| website=PoštaOnline
))</ref><ref>((
Cite web
| access-date=2023-09-11
| title=Czech Republic - 2k stamp of 1994 (#159053)
| url=http://stampdata.com/stamp.php?id=159053
| website=StampData
))</ref><ref>((
Cite web
| access-date=2023-09-11
| title=Stamp: NW 1900 (TATRA) (Czech Republic(Historical Vehicle) Mi:CZ 53,Sn:CZ 2932,Yt:CZ 52,Sg:CZ 58,AFA:CZ 52,POF:CZ 53
| url=https://colnect.com/en/stamps/stamp/114188-NW_1900_TATRA-Historical_Vehicle-Czech_Republic
| website=Colnect
))</ref>

==Background==
[[File:NW Rennzweier Front.jpg|thumb|left|250px|Front view]]
[[File:NW Rennzweier Side.jpg|thumb|left|250px|Side view]]


((Transcluded section | source=Präsident#Use in racing |part=Yes | title=Präsident § Use in racing))

After the production of its first automobile, the [[Präsident]], in 1897((Spaced ndash))1898, NW continued producing automobiles that followed the design of the original Präsident.

((#section-h:Präsident|Use in racing))

==Design==
The construction was unique at the time. The car was very low, especially the driver's seat. There was no bodywork – all mechanical parts were uncovered. Unlike its predecessors, the steering column was slightly tilted.

The car had a modified [[Carl Benz|Benz]] engine. It was a two-cylinder spark ignition engine with a power output of about ((Cvt|12|hp)) at ((val | 1=650 | ul=rpm)).<ref name="K 1975" /> It was transversely mounted above the driven rear axle.

The driver was situated on a heightened seat behind the steering wheel, while the passenger seat was much lower on the frame, so the passenger's legs were sticking out under the car.

The gas tank had a volume of 42 liters,<ref name="Vojtěch" /> while there was also another tank behind the driver for 15 liters of coolant.

The car was able to reach a maximum speed of ((Cvt|82|km/h)).

Von Liebieg raced the car in numerous contests. He won the La Turbie race that took place in Nice, and took second position in [[Salzburg]]-[[Linz]]-[[Vienna]] race. He later also took part in the [[Paris]]-Vienna race.

Today the Rennzweier is exhibited at the [[National Technical Museum (Prague)|Czech National Technical Museum]].

A second racing car was made in 1901. This one also made do without bodywork, and this time featured a ''Hardy'' engine (flat two, 3188cc, 7,4&nbsp;kW-8,85&nbsp;kW (10-12HP)) was used instead of the previous Benz one.<ref name="Rosenkranz 2007">((
Cite book
| date=2007
| first=Karel
| isbn=9788023998764
| last=Rosenkranz
| oclc=228593681
| publication-place=Kopřivnice
| publisher=Tatra
| title=Passenger Cars Tatra
))</ref>

==References==
((reflist))

==External links==
((commons category))
* [http://www.tatraportal.sk/?ukaz=data/clanky/rennzweier Magazine articles about the NW Rennzweier] ((In lang|cs))

((Tatra models))

[[Category:Cars of the Czech Republic]]
[[Category:Tatra vehicles]]
[[Category:Rear-wheel-drive vehicles]]
[[Category:Rear-engined vehicles]]
[[Category:1900s cars]]
[[Category:Cars introduced in 1900]]
[[Category:Sports cars]]

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