Military vehicle in off road operation
Date the photo was taken: 2017-10-02 Photographerb s name: Millbrook Location: Millbrook Proving Grounds File name: Bridge Launcher Hill Route & Off Road Description: Bridge Launcher Hill Route & Off Road
Driving with low tyre pressure in military operations
In military operations, driving in off-road conditions presents unique challenges and managing tyre pressure is crucial for optimal performance. Lowering tyre pressure can enhance traction, stability and comfort on soft soils. In this article, we will explore the benefits of low tyre pressure for your military off-road operations and the tools available to support this practice.
When should you use low-pressure tyres in military operations?
Using low tyre pressure in off-road environments is particularly important in several critical military situations. For example, when driving on soft loose soils, such as deep sand or thick mud, reducing tyre pressure allows the tyres to create a larger contact patch with the ground. This enhancement improves traction and reduces the risk of becoming stuck. Additionally, during extreme climbs or descents over steep, rocky terrain, lower tyre pressure can provide better grip and stability, helping to maintain control and avoid skidding.
In cold weather, snow or ice, lower pressure increases the military tyre's ability to adapt to uneven ground, which improves traction and reduces the risk of losing control. Similarly, on rough tracks with obstacles such as rocks or tree roots, low inflation pressure allows the tyre to flex and absorb impact. Strategically, it is essential to reduce military tyre pressure in these situations in order to optimise off-road performance and ensure safer driving.
What are the benefits of driving at low tyre pressure in military off-road environments?
Versatility
Lower tyre pressure can enable military vehicles to adapt better to different terrain, making it easier to overcome the various obstacles faced in off-road environments.
Improved Traction
Lowering tyre pressure increases the tyre's contact patch with the ground, which can improve grip on loose surfaces such as sand, mud or gravel. This allows military vehicles to operate more efficiently on difficult terrain.
Better Floatation
On soft surfaces such as sand or deep mud, lower inflation pressure allows the tyre to "float" rather than sink. This reduces the risk of getting stuck and allows smoother driving on difficult surfaces.
Enhanced Stability
Low tyre pressure in off-road conditions improves stability by allowing the tyres to better adapt to uneven terrain, improving grip and control while driving over difficult surfaces.
What are the risks of driving at low tyre pressure?
Driving at low pressure in military off-road environment can expose you to several of risks. But to prevent them, find out about the solutions you can implement:
Tyre dismounting from the wheel rim
Low tyre pressure can cause tyres to come off the rim, particularly on uneven terrain, leading to sudden loss of control and potential accidents.
However, beadlock systems can solve this problem by firmly clamping the tyre bead to the rim, preventing it from slipping off, even at low pressure.
Punctures and damage
Low tyre pressure in a military off-road environment can increase the risk of certain types of puncture and damage, as tyres are more exposed to impacts from sharp objects, rocks and uneven terrain.
However, military airless tyres could be a solution for off-road applications, only for military vehicles under 2.4t, as they eliminate the risk of punctures.
Need to adapt tyre pressure to different types of terrain
Since at low pressures tyres deform more under the weight of the military vehicle, they increase the contact patch and therefore provide better traction.
The Central Tyre Inflation System (CTIS) could be a useful tool in this regard, as it allows drivers to adjust tyre pressure according to the situation, while drivig.
Systems to help you drive at low tyre pressure
In certain off-road conditions, driving with tyres at low pressure can offer many of the benefits mentioned before. However, there are also risks that need to be carefully managed. Using the right systems can help drivers optimise their experience while mitigating potential dangers. Find out about 2 existing systems: Beadlock systems and Central Tyre Inflation Systems (CTIS)
Beadlock systems
Beadlock systems are designed to keep tyres securely in place, even at lower pressures, making them an excellent option to operate at low tyre pressure in off-road environments. Unlike standard wheels, which can allow tyres to unseat from the rim under challenging conditions, beadlock wheels feature a locking ring that clamps the tyre bead to the rim. This secure fit enables drivers to take advantage of lower tyre pressure for improved traction without the heightened risk of tyre detachment. With beadlock wheels, off-road drivers can confidently navigate rough terrains, knowing that their tyres will stay securely mounted, enhancing both safety and performance. It exists also internal beadlock inserts, a perfectly sized spacer that completely fills the inner void between each bead of the tyre. These beadlock inserts can be used on a standard wheel.
Central Tyre Inflation System
The Central Tyre Inflation System (CTIS) automatically adjusts tyre pressure in real time based on terrain, vehicle load, and speed. Controlled from the cabin, it ensures optimal performance without the need to stop and manually deflate or reinflate tyres.
CTIS improves traction, reduces tyre wear, saves fuel, and above all — saves time. By automating pressure management, it lets drivers stay focused on their off-road mission, not on their tyre pressure.
Frequently Asked Questions (FAQs)
The pressure of the air in the military tyre is crucial to the correct operation of the tyres: it is this pressure which both supports and moves loads or people:
- Safely
- Durably
- Economically
- Comfortably
So, military tyre pressure must be adapted to the vehicle's load and speed, as well as to the type of ground. In specific military off-road situations, reducing tyre pressure can improve traction and mobility on soft or loose ground, such as sand and mud.
It can be dangerous if you do not apply the recommendations of the tyre manufacturer about the correct pressure, depending on the context.
A tyre operated with insufficient pressure will undergo an abnormal rise in operating temperature, which can lead to irreversible damage of internal components and cause its complete destruction, to include rapid deflation of the tyre. The consequences of running with insufficient inflation pressure are not necessarily immediate and may appear even after rectification.
Insufficient inflation pressure also greatly increases the risk of impact-pinching related damage and aquaplaning.
Wrong military tyre pressure has a negative impact on certain fundamental aspects of safety performance, such as:
- casing strength
- vehicle stability and handling
- vehicle grip
- sensitivity to kerbing
The lowest safe military tyre pressure for driving can vary depending on the vehicle type, tyre design and intended use. Generally, it is essential to follow the vehicle manufacturer's recommendation to find the right pressure.
Did you know? To find out more information on MICHELIN tyre pressure recommendation, you can download our technical databook
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