Indirect:

The traditional method of escorting is done by making use of the hydrodynamic forces against the hull of the tug by creating a yaw angle with the thrusters. The hull form of a traditional escort tug is more important than the installed power configuration or system. This method is called indirect escorting and is only effective at high speed. The Rotortug® propulsion configurations enables you to look different at indirect escorting. 

 

 

Combined mode:

By using the latest available tugboat techniques, escorting can be done in a more safe and controlled way. This mode is called the combined mode which is a combination by making use of the hydrodynamic forces on the hull and the installed power at the same time. This combined mode effects in little heeling angle and with direct response time on pilot commands. The combined escort mode is unique for the Rotortug®.

 

 

Indirect escorting on low speed:

When the  assisted vessel is losing speed because it is approaching the berth, tugs are generally not able to assist in indirect mode, resulting in shifting from indirect to direct mode with temporary loss of towline forces. The Rotortug® doesn’t have to reposition and will always have a desired and controlled towline force and  response times is therefore minimized. This unique feature we call Rotoring.