The Boeing B Stratojet Boeing company designation Model is a retired American long- rangesix-engined, turbojet -powered strategic bomber designed to fly at high subsonic speed and at high altitude to avoid enemy interceptor aircraft. The primary mission of the B was as a nuclear bomber capable of striking targets within the Soviet Union. Another key innovation adopted during the development process was the swept wingdrawing upon captured German research. With its engines carried in nacelles underneath the wing, the B represented a major innovation in post- World War II combat jet design, and contributed to the development of modern jet airliners.
This would be soon followed by much larger contracts. Over 2, were manufactured to meet the Air Force's extensive demands, driven by the tensions of the Cold War. The B was in service as a strategic bomber untilat which point it had largely been supplanted by more capable aircraft, such as the Boeing B Stratofortress.
However, the B was also adapted to perform a number of other roles and functions, including photographic reconnaissanceelectronic intelligenceand weather reconnaissance.
While never seeing combat as a bomber, reconnaissance RBs would occasionally come under fire near to or within Soviet air space. The type remained in service as a reconnaissance aircraft until ; a handful served as flying testbeds up until The B arose from an informal requirement for a jet-powered reconnaissance bomber, drawn up by the United States Army Air Forces USAAF to prompt manufacturers to start research into jet bombers.
Boeing was among several companies to respond to the request; one of its designs, the Modelwas basically a scaled-down version of the piston-engined B Superfortress equipped with four jet engines. Wind tunnel testing had shown that the drag from the engine installation of the Model was too high, so Boeing's entry was a revised design, the Modelwith the four engines buried in the forward fuselage.
The powerplant was to be General Electric's new TG turbojet engine. He had heard about the controversial swept-wing theory of R. Jones at Langley, but seeing German models of swept-wing aircraft and extensive supersonic wind-tunnel data, the concept was decisively confirmed.
He wired his home office: "Stop the bomber design" and changed the wing design. It retained the four TG jet engines in its forward fuselage, with two more TGs in the rear fuselage.
The flush-mounted air intakes for the rear engines were inadequate while the USAAF considered the engine installation within the fuselage to be a fire hazard. The engines were moved to streamlined pylon-mounted pods under the wings, leading to the next iteration, the Modelwhich featured two TGs in a twin pod mounted on a pylon about a third of the way outboard on each wing, plus another engine at each wingtip.
The thin wings provided no space for tricycle main gear to retract so it would have needed a considerable bulge in the fuselage aft of the bomb bay for lateral stability. The only way to get a bomb-bay long enough for an A-bomb was to use a "bicycle landing gear",  the two main gear assemblies arranged in a tandem configuration and outrigger struts fitted to the inboard engine pods.
As the landing gear arrangement made rotation impossible, it was designed so that the aircraft rested on the ground at the proper angle for takeoff. According to aviation authors Bill Gunston and Peter Gilchrist, Boeing subjected the first prototype to "one of the most comprehensive ground-test programmes ever undertaken". The XB prototype flew its first flight on 17 December the anniversary of the Wright Brothers ' first four flights on 17 Decembertest pilots Robert Robbins and Scott Osler being at the controls.
Robbins stated that it had good flight characteristics. Robbins had been skeptical about the XB, saying that before his first flight he had prayed, "Oh God, please help me through the next two hours.
Boeing B-47 Stratojet
The second XB prototype first flew on 21 July and, following its delivery to the USAF in December of that year, served as a flying test bed until Its final destination was Chanute AFB where it was used as a maintenance and familiarization aircraft.It is mainly specialized in producing luxury sports autos which are sold worldwide.
At the same time Munich company owns other popular auto brands which include Mini and Rolls-Royce. The main feature of major BMW engines is the fact that they are very reliable, innovative and durable. This is why BMW engines gained perfect reputation and appreciation of consumers from all over the world.
The company offers wide range of engine series. They include economical 4-cylinder motors as well as 6-cylinder engines which have become very popular throughout many years. Those who are looking for diesel engine versions will also find the one that meets their requirements and demands.
No matter if you are going to buy used BMW auto or a new car. You may face some difficulties in choosing the most appropriate version of engine. You need to have a clear understanding which motor is more reliable and durable as well as which motor is more powerful and easy for further upgrades.Unitronic forum
MyWikiMotors will provide you with all necessary information as well as detailed description of different BMW engines. Here you can find modern and out-of-date versions of motors. You will find out where they were produced and what in what models they can be found. At the same time you will be provided with detailed description, overviews, specifications and characteristics.
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Honda J30A. Toyota 4A. BMW S Latest Most popular Mitsubishi 4GPrivacy Terms. Skip to content. Quick links. I know that the B47 timing chain is still buried at the back of the engine so would be engine out job to replace. I've been looking everywhere for someone else whos had a timing chain issue on a bmw 1 series f20 shape.Cabin fuse box
Luckily i was stationary so not too troublesome and i have a warranty direct policy otherwise I was looking at 1. Warranty direct are paying up except for the obvious things perishables, diagnosis, oil etc. Anyway, I've suspected my timing chain has been acting up for a while but the local garage i use always tried to reassure me it was fine. Cold starts were a bit horrible and sitting on the a14 often she would idle horribly. My cars sitting on k and I dont thrash it as its my daily so i was pretty surprised when I tried to start it after work and and she just wouldn't start.
Anyway, like i said I've looked everywhere to find out if anyone's had a timing chain issue and not found much. The only thing that seems to go is the DMF. Lots of information and failures online about the N47 engine.It stephen king book page 580
Giving the modular design of the B series engines I hope they've sorted the timing chains as there all now at the back of the engine. That's the route cause of the N47's design problem. Yearly oil changes help protect them and later in the engines life span they revised the chain tensioners and all but cured the problem.
When my d went in for replacement I was told a big factor was the cam shaft sprocket being too small. Board index All times are UTC.The Boeing B was the country's first swept-wing multiengine bomber.
It represented a milestone in aviation history and a revolution in aircraft design. Every large jet aircraft today is a descendant of the B Boeing engineers had envisioned a jet-powered plane as early as However, wind tunnel tests of straight-wing jet aircraft indicated that the straight wing did not use the full potential of jet-engine power.
At a hidden German aeronautics laboratory, Schairer saw wind tunnel data on swept-wing jet airplanes and sent the information home. Engineers then used the recently completed Boeing High-Speed Wind Tunnel to develop and design the XB, with its slender degree swept-back wings. Another innovation pioneered on the B was the concept of placing the engines in pods nacelles suspended under the wings.
A pod containing two General Electric J engines GE J engines for all production models hung from each wing inboard, and a single engine hung farther out. The B had tandem bicycle-type landing gear under the front and back sections of the fuselage.
BMW B47 four-cylinder diesel engine
Small outrigger wheels on the inboard engines kept the airplane from tipping over when it was on the ground. Thrust reversers and antiskid brakes had not yet been developed, so a ribbon-type drag parachute reduced the B landing speed. The B needed defensive armament only in the rear because no fighter was fast enough to attack from any other angle.
The B medium bomber became the foundation of the Air Force's newly created Strategic Air Command, and many were adapted for several specialized functions. One became a missile carrier, others were reconnaissance aircraft or trainers or carried remote controls for other aircraft. Between anda total of 2, Bs in all variants were built. Boeing built 1, Douglas Aircraft Co.
Boeing History Products B Stratojet. Historical Snapshot. The best way to tell about the performance of the Stratojet is to say that any good crew could have flown it. It took no unusual ability or education. Neither Scott Osler nor I deserve any credit for the flight. Rather, the credit should go to the men who carried out these visions on the drafting boards and the factory workers who made the visions a reality.Richest nakshatra
Technical Specifications. First flight Dec.The Boeing Model B Stratojet was a long-range, six-engined, jet-powered strategic bomber designed to fly at high subsonic speeds and at high altitudes to avoid enemy interception. The B's mission was primarily to drop nuclear bombs on the Soviet Union.
With its engines carried in pods under the swept wing, the B was a major innovation in post- World War II combat jet design, and helped lead to modern jet airliners. It never saw combat as a bomber, but was a mainstay of SAC's bomber strength during the s and early s, and remained in use as a bomber until It was also adapted to a number of other missions, including photo reconnaissance, electronic intelligence and weather reconnaissance, remaining in service as a reconnaissance platform until and as a testbed until The B arose from an informal requirement for a jet-powered reconnaissance bomber, drawn up by the U.
Boeing was among several companies that responded to this request; its initial design, the Modelwas basically a scaled-down version of the piston-engined Boeing B Superfortress equipped with four jet engines. Wind tunnel testing had shown that the drag from the engine installation of the Model was too high, so Boeing engineers then tried a revised design, the Modelwith the four engines buried in the forward fuselage.
The powerplant was to be General Electric's new TG turbojet engine. One of the Boeing engineers on the mission, George S. Schairerstudied German reports on the effects of wing sweepback on the performance of aircraft as they approached the speed of sound, and realizing the possible implications for the new bomber, sent word back to Boeing to stop work on the straight-winged design and switch to swept wings.
Analysis work by Boeing engineer Vic Ganzer suggested an optimum sweepback angle of about 35 degrees. The Model retained its four TG jet engines in its forward fuselage, with two more TGs in the rear fuselage. The flush-mounted air intakes for the rear engines were inadequate, while the USAAF disliked the installation of engines within the fuselage, considering it a fire hazard. The engines were moved out to streamlined pods pylon mounted under the wings, leading to the next iteration, the Modelwhich featured two TGs in a twin pod mounted on a pylon about a third of the way outboard on each wing, plus another engine at each wingtip.
The thin wings provided no room into which wheels could be retracted, so a "bicycle landing gear" was chosen, with the two main gear assemblies arranged in a tandem configuration and outrigger struts fitted to the inboard engine pods. As the landing gear arrangement made rotation i. People involved with the project were very excited, since they believed correctly as it turned out they were working on a breakthrough in aircraft design. Air Force on 18 September The XB prototype flew its first flight on 17 December the anniversary of the Wright Brothers' first four flights on 17 Decemberwith the test pilots Robert Robbins and Scott Osler at the controls of the aircraft.
BMW B37 And B47 Diesel Engines Get TU1 Twin-Turbo Upgrade
It flew from Boeing Field in Seattle to the Moses Lake Airfield in central Washington state, in a flight that lasted just 27 minutes,   with no major problems. Robbins had to pull up the flaps with the emergency hydraulic system, and the "engine fire" warning indicators were falsely lit. Robbins reported that the flight characteristics of the aircraft were good.BMW B47 engine low temperature coolant
During early tests of the XB prototype, the canopy came off at high speed, killing pilot Scott Osler. This resulted in a canopy redesign, and the hiring of pilot Tex Johnston as chief test pilot.
The first XB prototype was later retrofitted with these engines. Flight testing of the prototypes was particularly careful and methodical, since the design was new in so many ways.
The prototypes initially suffered from " Dutch roll ", an instability that caused the aircraft to weave in widening "S" turns.The new generation four-cylinder diesel engines not only increases the power output, but also lowers the fuel consumption. The BMW d now produces horsepower and has an average consumption of 4. Its little brother, the d now outputs horsepower and 4. Both engines can be paired to the revised ZF 8-speed automatic or the new six-speed manual.
The introduction of a new generation of four-cylinder diesel engines improves further on what was already an exceptional balance between performance and fuel economy. The new 2. At the same time, fuel consumption and CO2 emissions in the EU test cycle have been reduced by as much as 0.
If the optional eight-speed Steptronic transmission is specified, these figures improve further to 4. The likewise updated eight-speed Steptronic transmission is available for the rear-wheel-drive models as an option in place of the standard six-speed manual gearbox, and included as standard on the all-wheel-drive models.
New engine generation, new efficiency benchmark. The introduction of the new four-cylinder diesel engines represents the next stage in the process. They feature an aluminium crankcase with thermally joined cylinder liners to reduce internal friction and integrated balancer shafts, turbochargers with variable intake geometry and optimised efficiency, and further developed common rail direct injection systems.
The extra output, more instantaneous power delivery and high-revving character that these measures provide go hand in hand with not only greater fuel economy but also a reduction in weight of around two kilograms over the outgoing engines.
Being one of the best engines BMW has ever built, the N47 is now being replaced
In addition, fresh advances have been made in the area of acoustic comfort. The effectiveness of the turbochargers has been enhanced by a new roller bearing and extremely effective and need-based exhaust gas recirculation. The newly designed heat exchangers for the exhaust gas flow have a compact construction and optimised cooling performance, which leads to an effective reduction in maximum combustion temperatures.
Another special feature is the vacuum-operated bypass valve, which allows a higher proportion of uncooled exhaust gas to be fed into the engine while it is warming up, for example.
The new four-cylinder diesel engines are also equipped with map-controlled oil pumps. The new fully variable vane-type pumps enable continuously adjustable control of the volume flow and therefore the oil pressure in response to the operating status of the engine at any given time. More driving pleasure, lower fuel consumption: 0.
With the standard six-speed manual gearbox fitted, the new figures are 9. The advances made in efficiency alongside the optimised power delivery are reflected in fuel economy and emissions unparalleled at the premium end of the executive class. Further development of the eight-speed Steptronic transmission for improved efficiency, raised comfort levels and enhanced dynamics.
Another common theme of the new diesel-engined BMW 5 Series variants is the positive influence of the eight-speed Steptronic transmission on performance and fuel economy.
The latest update of the automatic transmission has been tuned precisely to the performance characteristics of the new-generation power units. Further improvements to internal efficiency and longer gear ratios open up additional efficiency potential. An rpm-linked vibration damper with engine-specific tuning allows economical driving at low revs to be combined with increased driving and acoustic comfort. In addition, converter slip during gear changes has been further reduced.
Based on navigation data, the gearbox identifies and takes into account an approaching corner, intersection, roundabout or motorway slip road. If the vehicle is approaching an intersection or a bend, for example, it changes down early to the most appropriate gear, making optimum use of the engine braking effect. The gearbox then shifts to the optimal gear to accelerate dynamically out of the bend. Furthermore, interaction with the navigation system allows unnecessary gear changes between two successive bends to be avoided.
New fuel consumption and emissions benchmarks in the executive class are also set with the eight-speed Steptronic transmission. With sales now topping 1. BMW announced earlier this year that a few of their models will get mild-hybrid powertrains, starting with the d and d Touring. Back then though, ….By the release of the restyling version of the BMW X3 Facelift ina new generation of diesel engines was introduced, which in subsequent years could become an integral part of the European fleet of BMW cars.
Engine B47, like its predecessor N47, has four cylinders and 2. Numerous improvements have been aimed at reducing fuel consumption and improving the sound of the engine. In one of the interviews, Christian Bock, the head of the new engine development project, revealed information about many technical features of the new 4-cylinder diesel unit, which is offered in variants with and hp.
It is impossible to overestimate the importance of an economical, but powerful diesel engine for the European market. For example, the motor of the d not only dominates the BMW 5 Series for a long time, but it is also very popular in the third series and off-road models X1 and X3.
Like its predecessor, the B47 has four cylinders arranged in a row, an injection system with a common injection pipeline, cubic centimeters of working volume and one turbocharger with variable geometry of the turbine. While the N47 in the x18d and x20d versions had and hp, the new B47 offers and hp.
The maximum torque in the case of the strong version remains at Newton-meters at rpm previously: rpm. In a more powerful series, this figure increased from to Nm at rpm previously: Nm at rpm.
The increased power and torque of the engine markedly improved the driving characteristics of the BMW X3. In addition, the optimization touched and indicators in the intermediate sprint. The new B47 complies with the Euro-6 environmental standard and is characterized by reduced fuel consumption in the Euro-cycle. Depending on the type of transmission and series of production, the reduction in fuel consumption is 0.
However, always whether the four-cylinder diesel engine will show a moderate appetite in practice, remains to be seen. In the case of the X3 sDrive18d, tires with low rolling resistance have provided the car with a consumption of 4. One thing is certain: the B47 engine will gradually supplant the N47 and for a long time will provide high performance and reduced fuel consumption, not only the restyling version of the X3, but also many other Bavarian cars.
Nevertheless, from the point of view of BMW, its main advantage is different. Compared with the N47, the new B47 uses much more unified parts, which allows them to acquire large quantities, significantly reducing the purchase price.
A website like BMW Greensboro will provide you with the highest quality in the industry. BMWbmw engine. You must log in to post a comment. This site uses Akismet to reduce spam.How to add hulu to cox contour
Learn how your comment data is processed. Skip to content By the release of the restyling version of the BMW X3 Facelift ina new generation of diesel engines was introduced, which in subsequent years could become an integral part of the European fleet of BMW cars. Power and torque diagram of the BMW B47 engine in variants with hp. Share this: Twitter Facebook. Like this: Like Loading Close Menu Overlay. Blog Blog Single Post.
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