Rapp Motorenwerke
Encyclopedia
Rapp Motorenwerke GmbH was one of the first aircraft engine manufacturers in Germany at the turn of the 20th Century and underwent numerous mergers and changes before becoming BMW AG
.
and Julius Auspitzer founded Karl Rapp Motorenwerke GmbH (Rapp Motorenwerke) with a capital stock of RM 200,000 on 28 October 1913 on the site of Flugwerke Deutschland GmbH (after the company went into liquidation). General Consul Auspitzer was the company's sole shareholder, with the operational side of the company managed by Karl Rapp. The idea was for the new company to build and sell "engines of all types, in particular internal combustion engines for aircraft and motor vehicles", in addition to building an engine for the second Kaiserpreis
(Kaiser's Trophy) rally, but it was not ready in time.
Before World War I
, Rapp produced both in-line 6 cylinder and V8 cylinder water-cooled aeroengines. The in-line 6 cylinder produced 125 hp @ 215 kg (474 lb); with a 901 cu in (14.8 litre) displacement. Soon, the company made the Rapp II, which increased the power output to 150 hp @ 260 kg (573 lb). Shortly thereafter, early into World War I, the Rapp III 175 hp (actual 162 hp @ 1400 rpm) 295 kg (651 lb) six cylinder aeroengine was manufactured. The V8 they developed was 1201 cu in (19.7 litre), producing 200 hp @ 300 kg (661 lb).
All of Rapp's designs were overhead cam, with forged steel liners screwed to cast steel heads. The aeroengines produced by Rapp were easily distinguished from the other aeroengines (Mercedes
, Benz, Basse
, Selve
, etc.), because the vertical shaft that drove the overhead camshaft came up between cylinders #4 and #5, instead of at the rear. Additionally, all the cylinders were in pairs.
When World War I broke out, German military authorities placed orders with Rapp Motorenwerke. With the influx of capital, the company expanded rapidly and employed 370 workers by 1915. In response to a commission from the German military authorities, Karl Rapp increased the output of his Rapp III engine from 150 to 175 horsepower. However, the strengthening which this called for made the engine extremely heavy, and the engines developed severe vibrations; so much so, that it achieved no commercial success. Even a revised version with four valves per cylinder, the Rapp IIIa, was unable to rectify this situation: the name Rapp had suffered to such an extent that the military departments no longer purchased engines from his company.
had noted the facilities of Rapp Motorenwerke were ideal for engine production, having the necessary workforce and equipment. Popp lobbied hard to manufacture, by license, the 12 cylinder Austro-Daimler
aircraft engine. Popp succeeded in convincing the Bavarian Army Administration and the Imperial Naval Office of the Imperial Austro-Hungarian Army Administration to order Rapp engines licensed through Austro-Daimler. On behalf the Austrian war Ministry, Popp was delegated to supervise the handling of the order in Munich. Popp was also the person who convinced Max Friz, an aircraft engine designer and engineer at Daimler, to come to Munich to assist in development and expansion. With Friz' arrival in 1916, the original Rapp designs were also worked on to create a "high altitude" aeroengine that would give the Imperial Army strategic air superiority in combat. 1917 marks the breakthrough by Friz and his team of engineers in developing the type III
.
's original design) was laid out as an in-line six cylinder, which guaranteed optimum balance, therefore few, small vibrations. The engine was successful, but the real breakthrough came in 1917, when Friz integrated a basically simple throttle butterfly into the "high-altitude carburettor", enabling the engine to develop its full power high above the ground. This is precisely the reason why the engine, now dubbed "type IIIa", had unique superiority in air combat. Franz-Zeno Diemer
, the pioneering aviator and test pilot for the company, sets a new world altitude record with a 32,000 ft (9,760 m) flight in 1919 flying a DFW F 37/III (experimental two-seater, often referred to as the C-IV) with a BMW Type IV aircraft engine. September of the same year, Diemer set another world altitude record- this one for a passenger aircraft (8 people on board, 6,750 meters) in a Ju F-13 powered by a BMW IIIa aircraft engine.
The decision by the Prussian Army Administration to order 600 units of the innovative high-altitude aeroengine (project name "BBE"), prompted reorganizing the legal structure of the company. The aeroengine developed by Friz had turned Rapp Motorenwerke into an essential contributor to the war effort virtually overnight. From the middle of 1917 onward, the business, which would probably have disappeared from history never to be heard of again, now enjoyed the undivided attention of the armed services and other governmental bodies. Large subsidies flowed in and the Munich company received well financed production orders. The recognition that Max Friz gained with his engine made it clear to all the senior managers that up to now Karl Rapp and his inadequate engine designs had held the company back from success. In Friz they now had an excellent chief designer on hand and were no longer dependent on Rapp. Therefore, on 25 July 1917 the partners in the company terminated Karl Rapp’s contract. The end of this collaboration had been coming for a long time. When Rapp’s departure was finally a certainty, another important decision had to be made. If the man who had lent his name to the company was now leaving it, a new name was naturally required. So, on 21 July 1917, Rapp Motorenwerke GmbH was renamed Bayerische Motorenwerke GmbH. It was thus the first company to bear this name and to use the abbreviation “BMW”. BMW AG acknowledges this date to be the official beginning of the company we know today.
The departure of Karl Rapp enabled a fundamental restructuring of BMW GmbH. While the development side was placed under Max Friz as Chief Designer, Franz Josef Popp took over the post of Managing Director. Until the end of the war, aeroengines remained the company's only product. The BBE aeroengine project was a big success under the designation BMW IIIa.
BMW
Bayerische Motoren Werke AG is a German automobile, motorcycle and engine manufacturing company founded in 1916. It also owns and produces the Mini marque, and is the parent company of Rolls-Royce Motor Cars. BMW produces motorcycles under BMW Motorrad and Husqvarna brands...
.
Early engines
Karl RappKarl Rapp
Karl Friedrich Rapp was founder and owner of the Rapp Motorenwerke GmbH in Munich. In time this company became BMW AG. He is acknowledged by BMW AG as an indirect founder of the company....
and Julius Auspitzer founded Karl Rapp Motorenwerke GmbH (Rapp Motorenwerke) with a capital stock of RM 200,000 on 28 October 1913 on the site of Flugwerke Deutschland GmbH (after the company went into liquidation). General Consul Auspitzer was the company's sole shareholder, with the operational side of the company managed by Karl Rapp. The idea was for the new company to build and sell "engines of all types, in particular internal combustion engines for aircraft and motor vehicles", in addition to building an engine for the second Kaiserpreis
Kaiserpreis
The Kaiserpreis auto race, named after Emperor Wilhelm II, was held in 1907. Like his brother's Prinz-Heinrich-Fahrt held from 1908 to 1911, it was a precursor to the German Grand Prix....
(Kaiser's Trophy) rally, but it was not ready in time.
Before World War I
World War I
World War I , which was predominantly called the World War or the Great War from its occurrence until 1939, and the First World War or World War I thereafter, was a major war centred in Europe that began on 28 July 1914 and lasted until 11 November 1918...
, Rapp produced both in-line 6 cylinder and V8 cylinder water-cooled aeroengines. The in-line 6 cylinder produced 125 hp @ 215 kg (474 lb); with a 901 cu in (14.8 litre) displacement. Soon, the company made the Rapp II, which increased the power output to 150 hp @ 260 kg (573 lb). Shortly thereafter, early into World War I, the Rapp III 175 hp (actual 162 hp @ 1400 rpm) 295 kg (651 lb) six cylinder aeroengine was manufactured. The V8 they developed was 1201 cu in (19.7 litre), producing 200 hp @ 300 kg (661 lb).
All of Rapp's designs were overhead cam, with forged steel liners screwed to cast steel heads. The aeroengines produced by Rapp were easily distinguished from the other aeroengines (Mercedes
Mercedes (car)
Mercedes was a brand of the Daimler-Motoren-Gesellschaft . DMG which began to develop in 1900, after the death of its co-founder, Gottlieb Daimler...
, Benz, Basse
Bassé
Bassé is a town in the Bourzanga Department of Bam Province in northern Burkina Faso. It has a population of 2,138.-External links:*...
, Selve
Selve
Selve Automobilwerke AG was a car maker located in Hameln .After World War I, the Northern German Automobile Works , which made the Colibri car and the Sperber, was absorbed by the Selve firm, which was already producing Basse & Selve engines for the automotive industry...
, etc.), because the vertical shaft that drove the overhead camshaft came up between cylinders #4 and #5, instead of at the rear. Additionally, all the cylinders were in pairs.
When World War I broke out, German military authorities placed orders with Rapp Motorenwerke. With the influx of capital, the company expanded rapidly and employed 370 workers by 1915. In response to a commission from the German military authorities, Karl Rapp increased the output of his Rapp III engine from 150 to 175 horsepower. However, the strengthening which this called for made the engine extremely heavy, and the engines developed severe vibrations; so much so, that it achieved no commercial success. Even a revised version with four valves per cylinder, the Rapp IIIa, was unable to rectify this situation: the name Rapp had suffered to such an extent that the military departments no longer purchased engines from his company.
Wartime production
At the beginning of the First World War, the company was one of the key Bavarian companies for the war effort, and appeared to have gained a certain reputation, despite the fact that none of the designs and developments achieved any real success (the Prussian Army Administration rejected a delivery of Rapp engines as unsuitable). Franz Josef PoppFranz Josef Popp
Franz Josef Popp was one of three men responsible for the founding of BMW AG and the First General Director of BMW AG from 1922 to 1942....
had noted the facilities of Rapp Motorenwerke were ideal for engine production, having the necessary workforce and equipment. Popp lobbied hard to manufacture, by license, the 12 cylinder Austro-Daimler
Austro-Daimler
Austro-Daimler was an Austrian automaker company, from 1899 until 1934. It was subsidiary of the German Daimler Motoren Gesellschaft .-Early history:...
aircraft engine. Popp succeeded in convincing the Bavarian Army Administration and the Imperial Naval Office of the Imperial Austro-Hungarian Army Administration to order Rapp engines licensed through Austro-Daimler. On behalf the Austrian war Ministry, Popp was delegated to supervise the handling of the order in Munich. Popp was also the person who convinced Max Friz, an aircraft engine designer and engineer at Daimler, to come to Munich to assist in development and expansion. With Friz' arrival in 1916, the original Rapp designs were also worked on to create a "high altitude" aeroengine that would give the Imperial Army strategic air superiority in combat. 1917 marks the breakthrough by Friz and his team of engineers in developing the type III
Type III
Type III may stand for:* Glycogen storage disease type III, a genetic disorder* Hyperlipoproteinemia type III, a risk factor for cardiovascular disease* The IBM Type-III Library, a distribution mechanism for unsupported IBM mainframe software such as CP/CMS...
.
BMW Type III
On 20 May 1917, Rapp Motorenwerke registered the documentation for the construction design for the new engine, dubbed "type III". Friz' design, (based on Karl RappKarl Rapp
Karl Friedrich Rapp was founder and owner of the Rapp Motorenwerke GmbH in Munich. In time this company became BMW AG. He is acknowledged by BMW AG as an indirect founder of the company....
's original design) was laid out as an in-line six cylinder, which guaranteed optimum balance, therefore few, small vibrations. The engine was successful, but the real breakthrough came in 1917, when Friz integrated a basically simple throttle butterfly into the "high-altitude carburettor", enabling the engine to develop its full power high above the ground. This is precisely the reason why the engine, now dubbed "type IIIa", had unique superiority in air combat. Franz-Zeno Diemer
Franz-Zeno Diemer
Franz Zeno Diemer was a flight pioneer in Bavaria, setting a number of world records, and Flight Officer for Bavarian Lifeguard Regiment.-Early life:Born in Oberammergau, Bavaria...
, the pioneering aviator and test pilot for the company, sets a new world altitude record with a 32,000 ft (9,760 m) flight in 1919 flying a DFW F 37/III (experimental two-seater, often referred to as the C-IV) with a BMW Type IV aircraft engine. September of the same year, Diemer set another world altitude record- this one for a passenger aircraft (8 people on board, 6,750 meters) in a Ju F-13 powered by a BMW IIIa aircraft engine.
Rapp Motorenwerke changes to BMW GmbH
The departure of Karl Rapp enabled a fundamental restructuring of BMW GmbH. While the development side was placed under Max Friz as Chief Designer, Franz Josef Popp took over the post of Managing Director. Until the end of the war, aeroengines remained the company's only product. The BBE aeroengine project was a big success under the designation BMW IIIa.