The RAVE (Robert Allan Ltd. Voith Escort) tug is a new concept (introduced in 2013) for a highly manoeuvrable, high-performance escort and ship-handling tug, jointly developed by Robert Allan Ltd. and Voith Turbo Marine. The most unique characteristic of the RAVE concept is the longitudinal alignment of the two VSP drives, in contrast to the more conventional transverse “tractor” configuration.
The RAVE design offers very precise and improved force generation characteristics, essential for the demands of indirect escort towing, and critically important for working in confined harbour and channel areas. The RAVE tug uses the variable pitch characteristics and the X/Y–logic of two Voith Schneider propellers for optimum power allocation and precise manoeuvring.
- Highly manoeuvrable, high-performance escort and ship-handling tug
- Unique fore and aft VSP drive configuration
- Performance proven by extensive testing and analysis
- Higher indirect steering forces than developed by a conventional VSP tractor configuration
- Responsive, controllable, powerful
The performance and configuration optimization of the RAVE tug has been thoroughly documented through an extensive series of model-tests and Computational Fluid Dynamics (CFD) analysis, sponsored jointly by the project partners. The RAVE technology can be applied to any size of VSP powered tug, depending upon the application and power requirements.
In 2014 the design group teamed with Multratug of the Netherlands to introduce a further development of this design, combining the unique rotating Carrousel™ towing system with the RAVE design. Orders for the first Carrousel-RAVE tugs were announced in November 2015.