What is a Flywheel for Car? Its Types, Free Energy Concept, Working Principle & FAQs [PDF]

What is a Flywheel in a Car?

A car’s flywheel is a circular wheel attached to the engine’s crankshaft that stores the engine’s mechanical energy during the power stroke and transfers this stored energy to the preliminary strokes (i.e. intake, compression and exhaust stroke). It is generally made of steel or cast iron. It is mainly used in motors and manufacturing machinery such as rolling mills, presses, shears, and presses.

Advantages of a Flywheels for cars

  • Energy Storage: It can store kinetic energy which is generated during acceleration. This stored energy can be used to provide additional power during overtaking or climbing hills.
  • Smooth Power Delivery: Flywheels can help in smooth power delivery by reducing fluctuations in torque. This can provide a consistent and comfortable driving experience for passengers.

Disadvantages of a Flywheels for cars

  • Weight and Space Requirements: Flywheels are generally heavy as well as they require a more amount of space. These are critical factors in achieving fuel efficiency and performance.
  • Complex Engineering: Designing and integrating a flywheel into a car’s drivetrain is a complex process and require specialized engineering expertise. This also increases the manufacturing costs.

Applications of Flywheels for Cars

  • Hybrid Vehicles: Flywheels can be used in hybrid vehicles to store excess energy generated during braking or deceleration. This energy can then be used to provide additional power when needed and improve the overall fuel efficiency.
  • High-Performance Cars: Flywheels can be used in high-performance cars to provide additional power during acceleration. This results in improved performance and faster acceleration times.

Types of Flywheels

Now since we know what a flywheel is in general. Let us now understand the different types of flywheel. Following are the main types of Flywheels:

  • Rimmed Flywheel
  • Solid Disc Flywheel
  • High-Velocity Flywheel
  • Low-Velocity Flywheel

Rimmed Flywheel

Rim-type flywheels explode at much lower RPM than full-face wheels of the same weight and diameter. For minimal weight and high energy storage capacity, the flywheel is formed from high-strength steel and manufactured as a conical disk with a thick center.

rimmed flywheel
Credits : CADforYOU

Advantages of Rimmed Flywheel

  • Increased energy storage capacity: Rimmed flywheels have a larger diameter compared to other types of flywheels. It allows them to store more energy. They are suitable for applications that require high energy storage such as in hybrid vehicles.
  • Improved stability and balance: Rimmed flywheels are designed with a rim around the circumference of the flywheel. This helps them to improve its stability and balance. Also this allows for smoother operation and reduced vibrations.

Disadvantages of Rimmed Flywheel

  • Higher weight and size: Rimmed flywheels are typically larger and heavier compared to other types of flywheels. This can be a disadvantage in applications where space and weight are limited.
  • Higher manufacturing and maintenance costs: The design complexity of rimmed flywheels can result in higher manufacturing and maintenance costs.

Applications of Rimmed Flywheel

  • Hybrid vehicles: They can be used in hybrid vehicles to store excess energy generated during braking or deceleration, which can then be used to provide additional power other applications.
  • Renewable energy storage systems: They can be used in energy storage systems for renewable energy sources such as wind or solar power. This allows them to store excess energy during peak production periods. This excess energy can then be released during periods of low production or high demand.

Solid Disc Flywheel

A solid disc flywheel is used for cast iron single flywheel threshing machines. A full disc flywheel has a flywheel hub and a disc attached. Various parameters are used as inputs in the full-disc flywheel design calculations. This includes dimensions for flywheels with solid discs. In addition, the resulting function value is calculated.

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Credits : Virtual Lab (NITK)

Advantages of Solid Disc Flywheel

  • High strength and durability: Solid disc flywheels are made from a single solid piece of material. This makes them highly resistant to wear and tear. They are ideal for heavy-duty applications such as in heavy machinery or industrial equipment.
  • Lower maintenance requirements: They have fewer moving parts compared to other types of flywheels, which can result in lower maintenance requirements and costs.

Disadvantages of Solid Disc Flywheel

  • Limited energy storage capacity: Solid disc flywheels typically have a lower energy storage capacity compared to other types of flywheels, due to their smaller size and weight.
  • Limited balancing options: They may have limited options for balancing, as they are made from a single solid piece of material. This can lead to increased vibrations and reduced stability during operation.

Applications of Solid Disc Flywheel

  • Automotive industry: Solid disc flywheels are commonly used in automotive applications, particularly in manual transmission systems to provide smooth operation and improved clutch engagement.
  • Industrial machinery: They are used in various industrial machinery and equipment, such as pumps, generators, and compressors making them suitable for heavy-duty applications that require reliable and efficient operation.

High-Velocity Flywheel

For these types of flywheels, the speed of the flywheel ranges between 30,000 rpm to 80,000 rpm. This is also adjustable up to 1,00,000 rpm. High-velocity flywheels have magnetic suspension bearings & require little maintenance. These are lighter compared to low-speed flywheels depending on their size/capacity. More expensive than low-speed flywheels.

Advantages of High-Velocity Flywheel

  • Higher energy storage capacity: They are designed to spin at very high speeds. This allows them to store large amounts of energy in a relatively small package. They are preferred for applications that require high energy storage, such as in hybrid vehicles, aerospace, or renewable energy storage systems.
  • Fast charging and discharging: These flywheels can charge and discharge quickly due to their ability to spin at high speeds. This makes them suitable for applications that require rapid response times, such as in electric vehicles or backup power systems.

Disadvantages of High-Velocity Flywheel

  • High manufacturing and maintenance costs: High-velocity flywheels require special materials and processes to withstand the high speeds and stresses involved.
  • Safety concerns: They can be very dangerous if not properly designed and maintained, as the high speeds involved can cause catastrophic failure if a component fails or breaks.

Applications of High-Velocity Flywheel

  • Aerospace industry: They can be used in aerospace applications, such as in satellites or spacecraft, to provide energy storage and stabilization during operation.
  • Electric vehicles: These type of flywheels can be used in electric vehicles to store excess energy during braking or deceleration improving the overall efficiency and performance of the vehicle.

Low-Velocity Flywheel

The low-speed flywheel has a speed of 10,000 rpm. They are heavier and bulkier than high-speed flywheels. It requires regular maintenance and does not use magnetic levitation bearings. Their installation requires a special concrete structure to support the weight. They are cheaper than a high-speed flywheel.

Advantages of Low-Velocity Flywheel

  • Lower manufacturing and maintenance costs: Low-velocity flywheels have a simple design and require less specialized materials. This result in lower manufacturing and maintenance costs.
  • Improved safety: Low-velocity flywheels operate at lower speeds which reduces the risk of catastrophic failure and makes them safer to operate.

Disadvantages of Low-Velocity Flywheel

  • Limited energy storage capacity: They typically have a lower energy storage capacity compared to other types of flywheels, due to their smaller size and weight.
  • Limited applications: They have limited applications due to their lower energy storage capacity and slower response times. This can make them less suitable for high-demand applications.

Applications of Low-Velocity Flywheel

  • Medical equipment: Low-velocity flywheels can be used in medical equipment, such as MRI machines, to provide energy storage and stabilization during operation.
  • Consumer products: Low-velocity flywheels can be used in consumer products, such as toys or portable electronics. Their lower cost and high safety make them suitable for these types of applications.

What do you mean by Free Energy?

Most new technologies have been discovered over time and have brought profound changes in the perception of electrical energy. However, at the same time, there is also a misunderstanding about “FREE ENERGY”.

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Concept of Free energy

The energy that has no cost is called free energy. It converts the mechanical energy that drives windmills or the solar energy of solar cells into direct currents. Other energies available are wind, hydro, and tellurium power. A Free Energy Generator is a method of generating free energy. There is no free energy in reality. Electrical energy from solar panels, wind, geothermal, and hydropower will only become free once the methods of generating this electrical energy are operational by providing a capital cost.

HOW does a free energy generator work?

These unconventional methods of generating electricity mean that you don’t have to pay for generation, so the energy is ultimately just free. From this, we can conclude that we can obtain sufficient amounts of energy from the local environment to meet our primary needs. This basic fact is denied on every occasion by conventional scientists who have decided not to accept it. The main reason for refusal to accept this fact appears to be perhaps financial gain. The correct scientific method is to improve scientific theories through observed facts and new discoveries, but the true scientific method is currently not followed.

Components of Free Energy Generator with Flywheel

A free energy generator uses this strong magnetic field to rotate the shaft of a motor. It works on the principle of neodymium magnets, whereas ordinary generators work on the principle of electromagnetic induction. Examples of free energy generators are flywheels and magnets.

The basic model of a free energy generator with a flywheel basically consists of the following components:

A Flywheel

A free energy generator where energy production occurs entirely from gravitational energy. We use a flywheel of considerable mass (kg) which is used for gravitational energy for more power.

A Generator

The generator is used to produce electricity.

A Motor

The engine is used to drive a series of belts and pulleys that form a gear train that more than doubles the speed on the generator shaft.

Connecting Shaft

Here we use two waves in the layout of the system. The shaft design should be calculated to find the proper shaft diameter that will easily withstand the load and provide maximum energy transfer with minimum losses.


Bearing selection is also an important criterion for the smooth long-term functioning of the system.


Pulleys are used for belt drives.

Belt Drive

Belt drives have been found to be suitable for power transmission through pulleys. In the first stage, pulleys were selected according to standard specifications. Each pulley has a different diameter and speed. Belt and wire (rope) drive are used for power transmission. This project uses a total of 6 pulleys, so 3 different belt drives are required.

Working Principle of free energy generator with flywheel

A 0.5 hp line motor is used to drive a series of belts and pulleys that form a gear train that more than doubles the speed on the generator shaft. What’s intriguing about this system is that more power can be drawn from the output generator than the input drive being drawn to the engine. Tseung’s theory of gravity explains that when a pulse of energy is applied to the flywheel, extra energy equal to 2mgr is injected into the flywheel at the moment of the pulse, where ‘m’ is the mass of the flywheel, ‘g’ refers to the gravitational constant, and “r” refers to the radius of the flywheel.

The distance from the axle to the point on which the mass of the wheel acts. If all of the flywheel’s mass is on the rim of the wheel, “r” would be the radius of the wheel itself. It means if the drive is restless, then there will not be a gain in energy. However, extra energy is drawn from the gravitational field in case the drive is not smooth. This rise in energy tends to the rise in flywheel diameter.


What is the flywheel connected to?

A flywheel is a heavy disk-like structure that is connected to the engine’s output shaft by a crankshaft bolt.

What is the difference between a battery and a flywheel?

Well, you can compare it with the mechanics of a mechanical battery. Batteries store energy in chemical form, whereas flywheels store power in the form of motion or kinetic energy to be exact. A flywheel can store more energy the faster it spins or has a higher moment of inertia.

What determines the size of the flywheel in an engine?

Flywheel size depends on the number of cylinders and engine design. The power flow out of the engine’s cylinders is not smooth. However, in a multi-cylinder engine, the power impulses overlap to give a fairly smooth power flow.

Video on Flywheel in a car

Credits : Engineering Explained


Based on the above studies on free energy generators using flywheels, the following conclusions are obtained. It is clear that cast iron flywheels are subject to greater stresses and deformations. Using S Glass Epoxy in the flywheel allows energy to be stored with less mass. Environmental concerns, combined with the demand for increased operational reliability, are likely to drive demand for new distributed generation systems that integrate grid-coupled and small energy storage devices. Flywheels are an excellent solution and enable market expansion. There is 18% additional power.

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