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Full-scale tests in Stockholm, for high-speed electric commuter vessel
The development of the BB GREEN Air Supported Vessel has been ongoing for several years. Now, a demonstrator called “AiriEl” has been delivered from the shipyard in Riga to Stockholm for optimisation and sea trials. This Air Supported demo vessel utilizes electric propulsion and the aim is to reach a cruising speed of 25 knots. SSPA has been commissioned by Stockholm County Council to conduct and verify the model tests previously carried out by SSPA for the prototype. The goal is new fast ferries that enables rapid and environmentally friendly public transport in cities.
During 2008 - 2015 a ship concept design was developed within the EU project BB GREEN. A ship concept design and system solution that can be used for different types of boats. The hull design is based on patented hull technology developed by Effect Ships International AS. The vessel type is called ASV, Air Supported Vessel, which rides partially on a cushion of air reducing the wetted hull surface compared to a conventional hull. The air cushion is replenished by a fan blowing air into a cavity in the ships bottom.
SSPA has experience in conducting model tests and full-scale testing of hull forms. In previous model tests, SSPA has measured up to 40% lower energy consumption for ASV compared to a conventional design with similar main dimensions. These full-scale measurements will include a traditional sea trial and measurements of waves and noise generated by the vessel. The sea trial aims at comparing the full scale ship with the prediction from the model testing performed by SSPA. In this way the hydrodynamic performance of the vessel can be assessed. The waves generated by the vessel are of interest for boaters but mainly for reducing shore erosion along a possible future route. A range of speeds will be tested. The entire trial will be carried out during the autumn 2016.
A special feature with this vessel is that it is fully electrically powered with batteries and quick charging technology. This is an interesting feature of the prototype; however, it does not impact the hydrodynamics of the testing. The radiated noise of the vessel will, most likely, be affected by choosing electrical drive to replace the conventional four stroke combustion engine.
Photo:The vessel “AiriEl” will initially be used for demonstration purposes across Europe. Krister Nilsson www.skargardsbatar.se. Read more at www.bbgreen.info.
Electric ASV Vessel BB Green AiriEl during test runs (by Green City Ferries)
The tests for this high-speed electric commuter vessel has given attention on Swedish television. Take a look at this clip from SVT Play News Stockholm, (in Swedish) www.svtplay.se/klipp/10797025/elbat-upp-till-test
Logistic solutions for future dense cities
Our experts have designed and performed a demonstration set-up to investigate the opportunities for using waterways in Gothenburg. There is a great deal of space available for transporting goods and waste, and moving the transport to waterways would relieve the pressure on the roads and reduce both congestion and noise pollution. SSPA will evaluate how the use of the city waterways could be scaled up and become a commercial solution in the future.
Demo tests for urban waterways and city logistics
During the spring, several projects are performing demo tests with the goal to develop the potential of inland waterways and city logistics in Sweden. SSPA is involved in several of these projects and our experts in logistics and shipping have knowledge to share. Waterways in urban areas have unused capacity which could be used for transport of people, goods and waste.