Enginediy is set to release a simplified high-bypass turbofan engine
July 22, 2025Are you a science lover? Well! Have you ever thought about the functioning of large jet engines? If so, then this article is just for you. Here, you’ll learn about how high bypass turbofan engines work, which is actually a kind of jet engine characterized by having a large fan at front.
Even if you have no prior knowledge about the science or just wish to gain more insight into planes, don’t panic because every minor term will be explained. So, keep reading!
What is a high-bypass turbofan engine?
A high-bypass turbofan is a type of jet engine in which the majority of the air bypasses the engine core instead of passing through it. Also, the bypassing air does most of the work in propelling the aircraft forward. By this logic, the engines acquire their name.
Actually, the term bypass denotes that air is skipping the central hot section of the engine, and the large volume of air flowing through it, hence named high-bypass
Now, a question might pop up in your mind: Is this so vital? Well! This engine design is smoother, quieter, more efficient, and more fuel economical. This is one of the reasons why almost all modern large airliners are equipped with high-bypass engines. They increase range and convenience for the passenger and the airline.How a High-Bypass Turbofan Engine Model Works
Studying a high-bypass turbofan engine model is beneficial for learning about jet engines. It gives you an understanding of how air is routed and how motion is transformed into thrust.
Well! First, we analyze the key components involved, then see how these work together with a step-by-step guideline.
Main Components of a High-Bypass Turbofan Engine Model
-
Front Fan: The intake air is split; some will enter the core, but a larger portion bypasses it. This provides a high thrust with a high bypass ratio.
-
Dual Shafts: Has two shafts, which are long, cylindrical rods. One drives the fan, and the other one drives the compressor and turbine. They both spin together in order for the engine to run.
-
Compressor: Elevates the incoming air temperature and pressure to store energy, compressing it.
- Turbine: It spins using hot, high-pressure air. This enables the shafts, fan and compressor to be powered.
- Bearings: Enhancing smooth and quiet spinning reduces friction.
- Housing (Engine Case): A protective, strong metal casing holds all parts of the engine and keeps them secured during operation.
- Power System: The system has a powered motor that requires a battery and an optional auto-cooling feature.
- Display Base: Enhances the appearance of the model while providing stability during display.
Step-by-Step Working Guide
Step 1: Air Is Drawn In by the Fan
When the motor is activated or the crank is turned, the front fan starts to spin. This creates a pressure differential that pulls in ambient air.
Step 2: Airflow Divides – Bypass and Core Paths
As the airflow enters, it is divided into two streams. A smaller portion (10-20%) goes into the core channel, while the larger part (80-90%) bypasses the engine core, and that’s what we call as bypass air.
This is where the term “high-bypass” comes from, because the bypass ratio (the amount of air going around the core compared to through it) is significantly high. This configuration serves the modern aviation engines to enhance their operational efficiency and reduce noise.
Step 3: Compression in the Core
Well! Now the 10-20% air that enters the core gets compressed by several rotating blades inserted in the compressor. These compressors actually serve the purpose of increasing air pressure and temperature prior to the combustion process.
Step 4: Combustion in combustion chamber
After this air the compressed air enters into combustion chambers where it gets mixed with fuel, producing a high-temperature gas.
Step 5: Turbine Rotation Demonstrates Energy Transfer
Now, the hot air is routed to turbines. Here, turbines spin and extract energy from the gases to run the compressor and front fan.
Step 6: Exhaust and Thrust Generation
Finally, the very hot gases exit the engine via a nozzle. Here, the interesting point to note is that when air enters the engine its speed is slow, but soon it enters into core and passes through compression, expansion, it shoots out of the engine at very high speed.
This sudden increase in speed causes thrust and means the plane moves forward. This actually follows Newton's third law of motion. For every action, there is an equal and opposite reaction. So,
Pushing air backward (fast exhaust) = moving the plane forward (thrust)!
How to Choose the Best High-Bypass Turbofan Engine DIY Model
If you are someone who enjoys learning and building things, a model of a high-bypass turbofan engine can be a project tailored just for you. However, you should check a few things before making a purchase so that you can be sure you are getting the right kit.
Let us explore them step by step so everything is clear.
Look for Realistic Design: To begin with, look at how close the model is to a real turbofan engine. This includes all the major parts such as the large front fan, bypass duct, engine core, and the turbine stages. Having a detailed design is beneficial since it enhances your understanding of all the subsystems.
Look for Rotating Features: If your kit also offers active components that can rotate, like fans and turbines, it would greatly enhance your experience. I’m saying this because active components of the model aid in making it interactive.
You can consider buying from engineDIy. We’re going to launch a simplified model of high-bypass turbofan engine to make learning enjoyable. You can check the below picture including different parts of engine which you just need to assemble via instructions provided side by side.
Choose Based on Learning Level: Moreover, you should also have to focus on your level. For a novice, a model with fewer components works best. However, those with some knowledge might appreciate more advanced models with intricate turbine-compressor detailing.
Power Source Matters: In cases where the model has a motor included, check its method of powering. Models that are powered using batteries or USB connections tend to be more convenient.
Look at the Instructions and Support: Remember that every kit has a manual. For some people, step-by-step photos, diagrams, or even videos can be a great aid in construction. This is especially true if you are building alone.
Read Reviews and Community Feedback: Last but not least, take some time to hear what others have to say, especially from community forums. Reviews from other DIY lovers or educators on YouTube or Reddit can tell you what works well—and what doesn’t—before you part with your money.
Well! I’m highly pleased to share with you that whether you are a DIY lover or a teacher, or students, the Enginediy proves to be a one-stop solution for you.
We have a high-quality, simplified high-bypass turbofan engine model designed to boost your creativity. Our product is made up of aluminum alloy and zinc alloy, making it highly durable. It also runs via electric motor, thus you operate it via turning the lever. Honestly speaking, this model is suitable for 16+ aged kids to understand the science behind it.
You’ll get all such unique models at affordable prices compared to the market. So, visit us now!
Turbofans Comparison: High-bypass turbofan vs low bypass turbofan
Alright! Let’s compare the features of a high-bypass turbofan engine with a low bypass turbofan engine. So, your concepts get revised, and you would know what the special thing is in this type of engine.
If you visualized both models, then you’ll notice that the high bypass engine one had a large fan at front. On the other hand, the low bypass engine has smaller one.
Well! A large fan as you know gets in a lot of air, but in high bypass the point to note is that only a little amount of air passes through the core (where fuel and air get compressed and combustion occurs, then energy is produced). Thus less noise is produced compared to low-bypass turbofan, which is the opposite case.
Okay! I have summarized all in the table below for a quick glance!
| High-bypass turbofan | Low-bypass turbofan | |
| Bypass Ratio | High (e.g. 5:1 to 12:1) | Low (e.g. 0.3:1 to 1:1) |
| Thrust Source | Mostly from bypass air (fan) | Mixed (bypass air + jet exhaust) |
| Fuel Efficiency | Very efficient at subsonic speeds | Less efficient than high-bypass |
| Noise Level | Quieter due to slower bypass air | Louder due to fast-moving core air |
| Environmental Impact | Lower emissions, eco-friendlier | Higher emissions |
| Common Use | Commercial airliners (e.g., Boeing 787) | Military aircraft (e.g., fighter jets) |
Final Words
At this point, perhaps you are asking yourself if building high bypass turbofan engines is feasible at home. Be patient! If you are a beginner or an experienced hobbyist, this project can easily be achieved using an EngineDIY model kit.
Our focus is on offering DIY engine kits at low costs to enhance aspiration among students or enthusiasts. So, visit us now to get such science-tech models at affordable prices!