Although you may not personally know this fact, safe off-road vehicle recovery is a technique that demands an understanding of the tools you’re using to do the recovery, plus a little bit of physics knowledge too!
A successful recovery starts with the right recovery aides and finishes with knowing the right ways to use them.
In this first part of this series about off-road recovery, we’ll focus on force and how it acts on your recovery equipment.
When you understand the forces at work and how they are applied, you’ll be better able to plan your recovery so it’s easy and safe with few issues getting your truck unstuck!
What Forces Affect Recovering A Stuck Vehicle?
Force can be simply described as a pull or push that results in one object's interaction with another object; it is mass times acceleration in Newton's well-known equation F = ma.
Where a stuck off-road truck or vehicle is concerned, force is related to the power required to get and keep an immobile truck or Jeep moving forward again until it’s no longer stuck.
The more certain forces act on a vehicle to prevent movement, the more power it takes to get it in motion again.
There are different forces that may be acting on a stalled vehicle depending on certain variables:
- Vehicle Weight - How heavy is the vehicle and is the recovery vehicle heavy enough to serve as an anchor?
- Surface - What type of material is the vehicle is locked up in such as sand, water, loose mud, sticky mud, and others?
- Depth - How deeply trapped is the vehicle, as the deeper it is, the more power is required to get it free and moving forward?
- High-Centered - How much of the underside of the vehicle is in contact with the ground and has force acting on it?
- Buried Wheels - How many and how deeply buried are the wheels because when more wheels are buried, more force will be required to pull the vehicle out?
- Ground Incline - Is the vehicle flat or facing downward as a vehicle that’s stuck downhill of the recovery vehicle creates more force and needs more power to move it?
When more of these factors are involved with the stuck vehicle, it will take even more power to move the truck to break it free and maintain enough forward force to keep it moving.
Do You Have Enough Power?
For a safe recovery, it’s essential that you be equipped with enough power to work against those forces holding the truck stuck and break it free to move forward again.
Whether you are attempting to pull the truck or Jeep out with another vehicle or preferably using a winch mounted on a winch bumper, the anchor vehicle must be larger and heavier than the stuck vehicle.
Since there are countless variables that can affect recovery situations, it’s recommended that your recovery vehicle be a lot heavier than the stuck vehicle so there’s no question that you have a solid anchor to winch with.
In addition, all other gear such as a winch cable, chain, or recovery straps must also be rated to handle the amount of force they will experience once a recovery is underway.
Whatever you consider your weakest link to be, be sure that it is over-rated to handle the job at hand or you could be facing trouble and possibly serious injuries.
Force and Power Affect Off-Road Recovery
Before you can attempt any kind of off-road recovery, you need to assess a situation and then decide what gear, including the recovery vehicle, you need to do it.
When you understand the way force acts to keep a vehicle stuck as well as how power fights that force to free it, you can make a more educated estimate of the tools you need for a safe recovery!
If you want more info about safe winching and off-road recovery, don't miss the next part of this series: Off-Road Recovery 102 - Shackle Hitches and Limitations!