Impulse turbines
These turbines change the direction of flow of a high velocity fluid jet. The resulting impulse spins the turbine and leaves the fluid flow with diminished kinetic energy. There is no pressure change of the fluid in the turbine rotor blades. Before reaching the turbine the fluid's pressure head is changed to velocity head by accelerating the fluid with a nozzle. Pelton wheels and de Laval turbines use this process exclusively. Impulse turbines do not require a pressure casement around the runner since the fluid jet is prepared by a nozzle prior to reaching turbine. Newton's second law describes the transfer of energy for impulse turbines.
Reaction turbines
These turbines develop torque by reacting to the fluid's pressure or weight. The pressure of the fluid changes as it passes through the turbine rotor blades. A pressure casement is needed to contain the working fluid as it acts on the turbine stage(s) or the turbine must be fully immersed in the fluid flow (wind turbines). The casing contains and directs the working fluid and, for water turbines, maintains the suction imparted by the draft tube. Francis turbines and most steam turbines use this concept. For compressible working fluids, multiple turbine stages may be used to harness the expanding gas efficiently. Newton's third law describes the transfer of energy for reaction turbines.
Petrol Remote Cars from XRC use actual unleaded petrol from the local petrol station and a mixture of 2 Stroke oil which you will find on the shelves in the actual shop. You pour in Unleaded petrol up to the first mark, then 2 Stroke oil up to the 2nd mark. The price of these Buggy Petrol Cars used to be over £700 but due to research and the manufacturing and production of all the parts are now under one roof, the companies save money in importing, exporting and general costs which allows for the cars to be sold for much less than they have done in the past. A typical price for the XRC Buggy is £299.00 including free delivery and incorporating VAT.
Nitrotrek are the sole distributor of the XRC Buggy within the United Kingdom, which they have a continued success with the popularity of this model. A video is available on our website and Nitrotek's to see the full quality and power of the Buggy Petrol Cars. Many other Petrol Remote Cars don't come with all the accessories you need to get going but the XRC Buggy does. Included is a great 1/5th Scale Steering servo, electronics battery pack and charger and even a tool kit.
The XRC Buggy also comes in Blue, Red or Yellow which can be chose at purchase and stickers so you can customise the car to suit your taste. A great model if you are looking into Buggy Petrol Cars but you can also get similar models in the nitro buggies range or in general nitro cars which include on and off road models.
Instead of using Petrol to power cars, these rc cars use Nitro Fuel which is purchased from model shops instead of petrol stations which is a little more inconvenient and costs a little more to but their speed is fantastic!. This is a high quality top of the range 1:8th Scale nitro buggy and one fast machine. Designed for speed, it comes with everything you could wish for in a rc car such as 3 shoe aluminum clutch, front CVD shafts, tough aluminium parts. Inside is a .21 GO engine which are designed in Taiwan and the best on the rc car market with a great rear exhaust. See the video on the website for more info.
There are many more variations of petrol rc cars, with XRC being a main manufacturer. Have a look at our website for more information and specifications.
http://www.petrolrccars.co.uk
Article Source: http://EzineArticles.com/?expert=Rob_D_Stone
BMW has announced the beginning of the production of the world's first hydrogen-powered luxury saloon car –BMW Hydrogen 7. Said new car is scheduled to make its public appearance at the Los Angeles Motor Show on the 28th of this month. The automaker will be producing a limited number of the car and said production will be offered next year to chosen users only.
The new car from BMW is based on the 7 Series. BMW body parts are equipped with an internal combustion engine that runs on liquid hydrogen or petrol. When the car is using liquid hydrogen as its fuel, it emits no more than water vapor. Hydrogen 7 also boasts its BMW car parts that include a 260 horsepower 12-cylinder engine. With it, the car accelerates from 0 – 62 mph in a matter of 9.5 seconds.
BMW Hydrogen 7 is designed to shift swiftly from hydrogen to petrol power. This can be done with just a push of the steering wheel-mounted button. The shift will not adversely affect BMW wheels.
The dual power technology of the car has a cruising range in excess of 125 miles in the hydrogen power and additional 300 miles under petrol power. Aside from the traditional 74-litre petrol tank, BMW Hydrogen 7 comes with a tank that can hold a maximum weight of 8 kilograms of liquid hydrogen.
The engine power and torque of the car remains the same regardless of the power source. Additionally, the driver can switch between the two power sources without compromising driving performance. BMW Hydrogen 7 prioritizes the utilization of the of hydrogen power however; when the power source run out, it switches to petrol power automatically.
The hydrogen technology used by the new BMW pride decrease emissions produced by personal transport and minimizes carbon dioxide emission as well. BMW, as well as other automakers like Volkswagen, Audi, Porsche, PSA Peugeot-Citroen, Ford, Audi, and Toyota are also venturing in hydrogen-powered vehicles.
100 units of BMW Hydrogen 7 will be manufactured in 2007. Details, pricing and other information about the 100 cars will be announced by the automaker at a later date.
As a manager of one of the largest auto store in Springfield,Massachusetts, Sarah has extensive expertise on auto parts and automotives in general. This 42 year old is a certified car enthusiast. You can visit BMW wheels for more information.
Article Source: http://EzineArticles.com/?expert=Sarah_McBride
There are many gas saving parts available out there in the market but not many uses water as a way to supplement petrol/diesel as fuel. One particular system uses water to generate hydrogen to power vehicles. It will not totally replace gasoline but is able to help drivers save lots of money by making their cars or even trucks go further on the same amount of fuel.
So what is this system about?
The gas saving parts use distilled water with a little bit of soda to produce what they call HHO or more commonly referred to as Brown gas. This gas is then supplied to the petrol or diesel engine's intake manifold or carburetor. When combusted, it produces huge amount of energy that can be used to power the engine simply because the gas produces hydrogen on demand during combustion. After that, all that is released is water and oxygen.
While the system does not do away with petrol, it causes the engine to be much more efficient in its use of petrol. A normal engine typically uses only 20% of the petrol/diesel, the rest of the 80% is discarded and released in the form of heat and emission of harmful gases into the atmosphere. The system drastically reduces this waste and that is why vehicles can run for longer distances with a full tank.
Is it expensive?
One would expect such a system to cost thousands of dollars. However, the good news is that the gas saving parts can be put together using parts obtainable from your local neighborhood hardware store. It is inexpensive and will cost you no more than $200.
Is it easy to install? What if I need to dismantle it?
A step-by-step guide is available on how to put the gas saving parts together which I will show you in a moment. The system is designed to allow drivers to be able to quickly dismantle and re-install the unit within minutes. It will not affect your vehicle warranty in anyway.
Read a review on a step-by-step guide on how to assemble gas saving parts using water as fuel and start saving money on fuel while saving the environment at the same time here.
Author's review website on clickbank products: http://www.clickbankproductreview.com
Article Source: http://EzineArticles.com/?expert=George_Tho
Spark-ignition two-strokes are small and light for their power output and mechanically very simple; however, they are also generally less efficient and more polluting than their four-stroke counterparts. However, in single-cylinder small motor applications, cc for cc,(cc meaning cubic centimeter), a two-stroke engine produces much more power than equivalent 4 strokes, due to the enormous advantage of having 1 power stroke for every 360 degrees of crankshaft rotation (compared to 720 degrees in a 4 stroke motor).
Small displacement, crankcase-scavenged two-stroke engines have been less fuel-efficient than other types of engines when the fuel is mixed with the air prior to scavenging, allowing some of it to escape out of the exhaust port. Modern designs (Sarich and Paggio) use air-assisted fuel injection, which avoids this loss, and are more efficient than comparably sized four-stroke engines. Fuel injection is essential for a modern two-stroke engine in order to meet ever more stringent emission standards.
An engine whose purpose is to produce kinetic energy output from a fuel source is called a prime mover; alternatively, a motor is a device which produces kinetic energy from a preprocessed "fuel" (such as electricity, a flow of hydraulic fluid or compressed air).
A car has a starter motor, a windscreen wiper motor, windscreen washer motor, a fuel pump motor and motors to adjust the wing mirrors from within the car and a (motorised) radio antenna - but the power plant that propels the car is an engine. Again an aircraft will have many motors installed for operation of its many auxiliary operations and services, but aircraft are propelled by engines, in this case, jet engines.