2015-06-02 00:00:00 Calculates the allowable wind speed. A crane has an allowable wind speed for each configuration. This rated wind speed is only suitable if the load is heavy for its size Relatively, otherewise The allowable wind speed needs to be reduced. This app Calculates this reduced wind speed for you. You simply enter the weight, shape and dimensions of the load and the rated wind speed for the configuration of the crane and you now the allowable wind speed.