What is Bmw 803?

Information about Bmw 803

The BMW 803 was BMW's attempt to build a high-power aircraft engine by "coupling" two BMW 801's back-to-back driving contra-rotating propellers. The result was a 28-cylinder 4-row radial engine, but due to cooling concerns, the entire engine was liquid cooled. As with most coupled engines, the 803 never really worked right, and did not enter production.

One problem with scaling up any engine design is that eventually a point is reached where the crankshaft becomes a major engineering challenge. This was a problem that affected almost all engines of the 2,500 hp class, including BMW's own 18-cylinder BMW 802 project. For the 803 the engineers decided to avoid this problem by simply not using a common crankshaft, and driving a set of independent contra-rotating propellers. The front engine drove the front propeller directly, while the rear engine drove a number of smaller shafts that passed between the cylinders of the front engine before being geared back together to drive the rear prop. This layout resulted in a rather large gearbox on the front of the engine, and the front engine needing an extended shaft to "clear" the gearbox.

With no common crankshaft all of the accessories had to be powered by one engine alone, in this case the rear engine. The supercharger itself used up several hundred horsepower, so the rear prop ended up delivering considerably less power than the front one.

The engine weighed a staggering 2,950 kg (6,490 lb) dry, and 4,130 kg (9,086 lb) fully loaded, displacing a massive 83.5 litres. For all this weight it delivered 3,900 PS (metric hp) (2,868 kW). Although this made it the most powerful German engine design, its power-to-weight ratio was not at all impressive, at about 0.60 hp/lb, comparing rather poorly with other large designs like the Junkers Jumo 222 at 1.04 hp/lb. Specific power was likewise poor, at about 34.4 kW/l, compared to the 222's 40 kW/l, as was specific fuel consumption, at 380 g/kWh (0.63 lb/hp·h), comparable to late generation turboprops.

The engine was intended to be used only on the largest of designs, notably the Focke-Wulf Fw 238 and other large bombers. FW used it in single-seat fighter design, and it also appeared on several Blohm und Voss designs as well. None of these designs was particularly inspiring, and as the engine never matured the project was cancelled. A single example remains in the Deutsches Museum.

Specifications (BMW 803)

General characteristics
  • Type: 28-cylinder four-row radial engine
  • Bore: 156 mm (6.14 in)
  • Stroke: 156 mm (6.14 in)
  • Displacement: 83.5 L (5,095 in³)
  • Diameter: 160 cm (63 inches)
  • Dry weight: 4 130 kg (9,100 lbs)

Components
  • Valvetrain: One intake and one sodium-cooled exhaust valve per cylinder
  • Fuel system: Fuel injection
  • Cooling system: Liquid-cooled

Performance
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Bayerische Motoren Werke AG

Aktiengesellschaft
Founded 1916
Headquarters Munich, Germany

Key people Dr. Norbert Reithofer, Chairman and CEO
Industry Automotive
Products Automobiles
Motorcycles
Revenue €49 billion (2006)
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The term aircraft engine, for the purposes of this article, refers to reciprocating and rotary internal combustion engines used in aircraft. Jet engines and turboprops are the other common aviation power plants; while operation differs substantially, the basics here apply to all
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BMW 801 was a powerful German air-cooled radial aircraft engine built by BMW and used in a number of German military aircraft of World War II. The engine's cylinders were in two rows of seven cylinders each, the bore and stroke were both 156 mm, giving a total capacity of 41.
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The radial engine is an internal combustion engine configuration in which the cylinders point outward from a central crankshaft like the spokes on a wheel. This configuration was very commonly used in aircraft engines before being superseded by turboshaft and turbojet
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The BMW 802 was a large air-cooled radial aircraft engine, built using two-rows of 9-cylinders to produce what was essentially an 18-cylinder version of the 14-cylinder BMW 801.
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For other meanings, see supercharger (disambiguation)


A supercharger (blower) is an air compressor that forces more air and more oxygen to the combustion chamber(s) of an internal combustion engine than achievable with ambient atmospheric
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Power-to-weight ratio (specific power) is a calculation commonly applied to engines and other mobile power plants to enable the comparison of one unit (design) to another. Power-to-weight ratio is a measurement of actual performance of any engine (power plant).
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The Jumo 222 was a high power aircraft engine design from Junkers. The design failed to mature even after years of intensive development, dooming the entire Bomber B program along with it.
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In engineering, specific power, also known as power per unit mass or power density, refers to the amount of power delivered by an energy source, divided by some measure of the source's size or mass.
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Specific fuel consumption, often shortened to SFC, is an engineering term that is used to describe the fuel efficiency of an engine design with respect to a mechanical output.

SFC for thrust engines (e.g.
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turboprop engine is a type of gas turbine engine used in aircraft. Most of a turboprop engine's power is used to drive a propeller, and the propellers used are very similar to the propellers used in piston or reciprocating engine-driven aircraft (with the exception that turboprops
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bomber is a military aircraft designed to attack ground targets, primarily by dropping bombs.

Classifications of bombers

Strategic bombers are primarily designed for long-range strike missions with bombs against strategic targets such as supply bases, bridges, factories,
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fighter aircraft is a military aircraft designed primarily for attacking other aircraft, as opposed to a bomber, which is designed to attack ground targets, primarily by dropping bombs. Fighters are comparatively small, fast, and maneuverable.
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Blohm + Voss GmbH

Private
Founded 1877
Founder Hermann Blohm and Ernst Voss
Headquarters Hamburg, Germany

Industry Shipbuilding
Parent ThyssenKrupp Marine Systems
Owner ThyssenKrupp
Website www.blohmvoss.
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The Deutsches Museum (German Museum) in Munich, Germany, is the world's largest museum of technology and science, with approximately 1.3 million visitors per year and about 28,000 exhibited objects from 50 fields of science and technology.
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The radial engine is an internal combustion engine configuration in which the cylinders point outward from a central crankshaft like the spokes on a wheel. This configuration was very commonly used in aircraft engines before being superseded by turboshaft and turbojet
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Sodium (IPA: /ˈsəʊdiəm/) is a chemical element which has the symbol Na (Latin: natrium), atomic number 11, atomic mass 22.9898 g/mol, common oxidation number +1.
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Fuel injection is a means of metering fuel into an internal combustion engine. In modern automotive applications, fuel metering is one of several functions performed by an "engine management system".
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In engineering, specific power, also known as power per unit mass or power density, refers to the amount of power delivered by an energy source, divided by some measure of the source's size or mass.
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For compression ratio in data compression, see .


The compression ratio is a single number that can be used to predict the performance of any engine (such as an internal-combustion engine or a Stirling Engine).
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Specific fuel consumption, often shortened to SFC, is an engineering term that is used to describe the fuel efficiency of an engine design with respect to a mechanical output.

SFC for thrust engines (e.g.
..... Read more.
Power-to-weight ratio (specific power) is a calculation commonly applied to engines and other mobile power plants to enable the comparison of one unit (design) to another. Power-to-weight ratio is a measurement of actual performance of any engine (power plant).
..... Read more.
This list of aircraft is sorted alphabetically, beginning with the name of the manufacturer (or, in certain cases, designer). It is an inclusive list rather than an exclusive
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Contents
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