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Electric Turbo-Jet Engines Electric Powered Turbine Engines For The 21st Century Electric Turbo Jet Engine (Mod-3) The Mod 3 Electric Turbo Jet Engine is the result of four years of development and construction. Much of the time has been spent machining and manufacturing all of the assemby parts. At this point the engine is finished except for on-going changes and modifications to the motor brush holders and commutator rings. The tests involving fits and clearances was completed but full power test runs have not yet been performed. I have also been involved in designing a new motor concept that will make the engine more efficient and reliable. The new drive motor incorporates a radical design shift to high speed armature with electronic commutation and speed controls. The engine is a 12 volt DC powered, Seven Turbine Stage powerplant., It is a Three Spool, Multi-Speed Axial Compressor engine that utilizes the same high speed gearless reduction technology in a 2,8 to 1 speed ratio. The upper illustrations show the engine with aircraft inlet cowls with motor bleed ring for inlet anti-ice functions It can also be used as a heat source for other vehicles. The illustrations below show the engine as it would appear in a car turbine powerplant installation. Turbo Electric Engine Sections The Mod 3 engine is shown above with each section labled.. The Mod 3 Engine has a greater width of 8 inches with an overall length of 13 inches without the inlet cowl. Since it is a cold flow engine many of the parts are formed and machined out of high strength, fibered Delron plastic. The weight of the core engine without the inlet cowl is 7 pounds . With the inlet cowl installed the engine is 23 inches in length and weighs about 13 pounds. The inlet is constructed of riveted aluminum. Like the original design, it has multi-stage, multi-speed configurations that fully utilizes the Braden power cycle to generate speed, power and thrust. In this model, the forward low pressure compressor was increased in size to provide more low stage air volume and pressure. This is not a small scale mock-up. For the automotive application, this the full size turbine that is part of the electric turbine engine powerplant. This will be explained later as we examine the car engine installation and operation. How does a fuel combustion jet engine work? The operation of a standard Axial Flow Jet Engine is fairly simple. Air enters the inlet and is compressed and accelerated by the First Stage Turbines. Next, the accelerated air enters the Second High Speed Turbine Stage where it is compressed and accelerated again. This air is then mixed with injected jet fuel and ignited. The explosive force is directed through the Third Stage power recovery turbines which are directly connected to the first stage turbines. The resulting thrust is ejected from the tail pipe. The recovered power turns the First Stage faster, causing the Second Stage to turn faster, more fuel is ignited and the Power Return Turbine turn faster turning the First Stage Even Faster.etc...ect...ect... This process continues until the engine reaches Idle RPM and then by increasing the throttle, more fuel is injected until the engine reaches Full RPM and Thrust Velocity. This principle is called the Brayden Power Cycle. Brayden Power Cycle = Turbine Acceleration The Electric Turbo Jet Engine operates exactly the same way as a conventional jet engine. However instead of using "Jet A" aircraft fuel and injecting it into the combustion chambers, we employ a high speed electric motor and increase the amount of electricity to power it. In this engine design, the run dynamics are also highly efficient. and requires less electricity The entire electric load at full power is approximately 200 watts. One of the advantages of the electric jet engine is that it doesn't require an air breathing atmosphere in order to operate. A standard jet engine has a service ceiling of about 50,000 feet altitude. Once we get above that, the engine begins to starve for air.and incomplete combustion takes place. When the fuel combustion gets below a minimum level, the engine flames out.and stops operating. This is one thing that can't happen to an electric jet engine. The engine continues to operate normally even at high altitudes. Another point is that as the air gets thinner, the electric motor has an easier time turning the turbine wheels which means the engine has a self compensating factor that allows it to increase it's speed in proportion to atmospheric density. Of course the electric engine does have an altitude limit, because eventually, the air gets too thin to compress and there would be a loss of thrust. But the altitude limit is far above that of a standard fueled combustion jet engine. The usable service altitude may be as high as 75,000 to 100,000 feet. SolutionsTo Problems With Current Electric Motors And Batteries Improved Electric Motors The key to the Electric Turbo-Jet Engine is of course the size and power of the electric motors that are employed. But, it is not power or torque that concerns us the most. One of the most important dynamic to consider is RPM. The motor must be powerful enough to turn the compressors yet still be able to provide the high RPM necessary to produce the thrust. Most electric motor manufacturers are more concerned with power and torque than RPM. Another problem, is that as we increase the size of the motor, the armature size and weight also increases. Turning a larger, heavier armature runs into maximum rotational inertia factors. In other words, the speed of a larger armature becomes more difficult until the armature hits what is called the 'Inerta Wall". At this point, as we increase the electrical power, the armature can't turn any faster, so it just begins to overheat.. Eventually, we increase the amount of electricity until it just burns out. One the solutions was to design a new type of motor that utilizes field and magnet principles in a radical new way. The shaft mounted armature field commutator and brushes have been eliminated. This eliminates brush segment skipping and loss of contact at extreemely high rpm. The motor is designed with highly efficient brushless electronic commutation which is used along with an electronic throttle module. This should radically improve the performance of the electric turbo-jet engine. Improved Battery Formulas And Designs One of the major problems with batteries is that standard lead acid block case batteries are heavy and only have a relatively short service life. After three years I have come up with a new electrolte formula that greatly improves the performance of the batteries while requiring far less electricity to charge them. I have also come up with a new battery pack configuration that's composed of 4 to 6 separate battery cells in a flexible design. My current model is 12 amp hours but they can easily be increased in size to provide 25 to 30 amp hours of power. Measuring ten inches in width, and 14 inches in length, my current prototype can be bent into any number of shapes to conform to irregular mounting surfaces. They can be easily installed in cars and aircraft in unused areas such as fender wells and wings. The new electrolite formula also increases the service life of the batteries so that they can last from 5 to 10 years, or the life of the car. This new battery technology will be discussed in greater detail on other pages of this web site. These electric engines have many application in virtuatly all forms of transportation. Like gas turbines, there are applications and models that would be well suited for most automotive uses. Companies and Venture Capital entities wishing to discuss these designs, and continued development of these electric turbine engines are welcomed to forward their questions and comments For more Information contact McCotter Technologies at the E-mail address below E-mail - g_mccotter@prodigy.net G.R.McCotter McCotter Technologies 14710 E. 140th St. N. Collinsville, OK 74021 (918) 371 - 4271 Copyright © 2008 All Rights Reserved All images, text, content, ideas, concepts, designs, systems, components, are considered to be copyright and intellectual property and product of Gerald R. McCotter and McCotter Technologies. Any unauthorized use of any of the items listed above will be considered a violation of copyright and theft of proprietary and intellectual property under U.S and International Laws.