Ball thrust is the force that a trailer applies to the tow bar of a car via the coupling. The amount of pressure exerted on the tow bar will depend on how the trailer has been loaded. For example, a heavy weight positioned near the drawbar could result in excessive ball thrust, while positioning too much of the load at the back of the cargo bed will result in insufficient ball thrust. A negative pressure may be the case too, if an upward force is applied to the tow bar. All of these situations are the result of incorrect loading, resulting in an increased risk of skidding and swerving.
This makes ball thrust one of the most important criteria for the road-holding of trailers and the road-handling of the vehicles towing them. HAPART Aanhangwagens bears in mind the need for optimum ball thrust when developing trailers too - when considering the distance between the axles and the centre of the wheels, for example.VISIT A DEALER NEAR YOU
The ideal ball thrust is close to the maximum allowable pressure. Please note: a trailer's ball thrust may not exceed the maximum value permitted for the car and/or the tow bar being used (see the specifications for the tow bar or vehicle in question). You will find the maximum load for your HAPERT trailer on the type plate for your particular model.
Before you measure ball thrust, it will be important to know the maximum load your trailer is able to transport. The type plate for each HAPERT trailer always includes the relevant gross loading capacity, which is the maximum combined weight of the trailer and the load it is carrying. So, you will need to deduct the weight of the trailer from the gross loading capacity to work out the weight your particular HAPERT model is able to carry.
To make sure that your brakes work properly and road handling is good, the centre of gravity must be as close as possible to the axle. You are probably now wondering how to position a load on your trailer to avoid insufficient or excessive ball thrust. The causes and of consequences of and solutions to both situations follow below.
A number of other tips on how to achieve correct ball thrust follow below:
In addition to the tips we have already given you, we advise that you always measure ball thrust too. You could do this with a special ball-thrust gauge or an ordinary set of scales. The procedure is as follows:
We advise that you always weigh loads that you have not transported before. If possible, enquire about the exact weight of the load before you actually transport it in your trailer.
For good road handling, it is essential for the coupling height of the car to correspond with the coupling height of the trailer. When buying a trailer, ask your HAPER dealer for advice about the coupling height. This is important, as there are many ways in which this can be adjusted!VISIT A DEALER NEAR YOU
Personal advice from a dealer near you: