Ayrton Oneill
Pop-pop boats are notoriously inefficient, and there are many reasons why they might not work. For example, the weight of the ball bearings might be too much for the amount of energy it takes to open or close a valve, leaving little energy for propulsion. Or, if too much air enters the boiler, the oscillation stops because all the water has been displaced, and no steam can be generated.
| Characteristics | Values |
|---|---|
| Engine type | Coil |
| Engine size | Large |
| Engine weight | Heavy |
| Engine power | Low |
| Engine efficiency | Low |
| Engine frequency | Low |
| Engine operation | Sporadic |
| Engine oscillation | Stopped by air build-up |
| Engine valves | Ineffective |
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What You'll Learn
The weight of the ball bearings
However, it is important to note that the weight of the bearings is not the only factor affecting the performance of a pop-pop boat. The size of the boiler and the length and diameter of the intake/exhaust pipes also play a crucial role. These factors determine the natural frequency at which the resonant engine operates. If the natural frequency is not aligned with the desired speed and movement of the boat, the boat may still struggle to move forward, even with lighter bearings.
Additionally, the volume of the boat's internal coil can impact its performance. A larger coil may result in a larger boiler, which can affect the frequency of operation and the overall efficiency of the boat. Therefore, when troubleshooting a pop-pop boat, it is important to consider not only the weight of the ball bearings but also the design and dimensions of the boat's engine and boiler system.
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The engine's natural frequency
Pop-pop boats are inefficient for many reasons, but the main problem is the action by which it moves forward. When the engine pops, it squirts water out of the exhaust, which travels almost in a jet.
Pop-pop boats are resonant engines, which means they work at a natural frequency that is dependent on the size of the boiler, the length and the diameter of the intake/exhaust pipes. The natural frequency of the engine is the rate at which it vibrates when it is not subjected to any external force or influence. This is important because if the natural frequency of the engine is too low, it will not be able to generate enough power to move the boat forward efficiently.
The size of the boiler and the length and diameter of the intake/exhaust pipes can affect the natural frequency of the engine. For example, if the boiler is too large, the inertia of the water displaced with each cycle will limit the frequency of operation to a point where there is little motion, or the motion can be rather sporadic. Additionally, the weight of the ball bearings can also affect the natural frequency of the engine. If the amount of energy it takes to open or close a valve is too high, there will be little energy left for propulsion.
To improve the natural frequency of a pop-pop boat engine, one could consider reducing the size of the boiler, or using lighter ball bearings. Additionally, ensuring that the intake/exhaust pipes are the correct length and diameter for the size of the boiler can also help to optimise the natural frequency of the engine.
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The size of the boiler
The boiler must also be able to "burp" out air periodically to prevent too much air from entering the boiler and stopping the oscillation of the water. This is because any air in the boiler can act as a spring and support the oscillation of the water, but if too much air enters, all the water is displaced, and no steam can be generated.
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The length and diameter of the intake/exhaust pipes
The coil engine in a pop-pop boat has a minimum radius to which you can bend a pipe without flattening or crimping it. If the pipes are too narrow, it may be difficult to package them in the boat hull. Additionally, pop-pop boats don't work well at larger volumes as the inertia of the water displaced with each cycle limits the frequency of operation.
It is also important to consider the weight of the ball bearings in the engine. If the bearings are too heavy, they can take up a lot of energy to open or close a valve, leaving little energy for propulsion.
Finally, the intake and exhaust pipes play a crucial role in the expulsion of air from the boiler. If too much air enters the boiler, the oscillation stops, and no steam can be generated. Therefore, the pipes must be designed to allow the engine to burp out air periodically to ensure long-term operation.
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The volume of the coil
Pop-pop boats don't work well at larger volumes as the inertia of the water displaced with each cycle limits the frequency of operation to a point where there is little if any motion, or the motion can be rather sporadic. This means that the internal volume of the coil that forms the boiler may be too large.
The coil engine is the part of the boat that bends the pipe without flattening or crimping it. The minimum radius to which you can bend a pipe will dictate the diameter of the coil. If the coil is too large in diameter, it will be hard to package in a boat hull.
To avoid the engine being too large, you need to consider the size of the boat hull when designing the coil. The coil should be small enough to fit inside the boat hull without being flattened or crimped.
It is also important to ensure that the coil is not too large in volume, as this can cause the engine to lose efficiency. The volume of the coil should be balanced with the size of the boiler and the length and diameter of the intake/exhaust pipes to ensure optimal performance.
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Frequently asked questions
There are a few reasons why your pop-pop boat might not be working. Firstly, the engine may be taking in too much air, causing the oscillation to stop and no steam to be generated. Secondly, the weight of the ball bearings could be an issue, as the energy required to open or close a valve may be taking up all the energy that would usually be used for propulsion. Finally, the size of the boat and the coil engine may be incompatible, causing the inertia of the water displaced with each cycle to limit the frequency of operation.
If your pop-pop boat engine is taking in too much air, it can cause the oscillation to stop and no steam to be generated. To fix this, you need to ensure that the engine \"burps\" out air periodically to prevent a build-up of air in the boiler.
The weight of the ball bearings can be an issue in a pop-pop boat because the energy required to open or close a valve may be too high, leaving little energy for propulsion. To fix this, you may need to reduce the weight of the ball bearings or find a way to optimise the energy usage in your boat's design.
