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Sled testing is one of the most important test methods for the evaluation of vehicles interior with respect to crash safety. This method allows one to simulate real crash conditions without destroying the vehicle structure. In addition to conventional sleds which are accelerated smoothly using a bungee cord or other device and then impact a deformation element, catapult sled types act in a reverse mode. The sled is thus accelerated for approximately 100 ms to the impact speed and then smoothly decelerated. To ensure good correlation with the full scale crash test an accurate modelling of the vehicles crash pulse must be guaranteed Catapult type sleds guarantee, that the sled will not move before the pulse starts. Therefore well defined initial conditions especially regarding dummy positioning can be guaranteed. While conventional catapult type sleds mainly work on hydraulic or pneumatic modulation of the pulse.