We have an idea of marine high power electric propulsion. We believed that in few years there will be a need for this type of products on pleasure marine market. In the same time we were sure that most difficult, and therefore not easy to enter, will be market with high power. Where large energy storage systems are used. In the same time costs of propulsion are more acceptable for truly luxury yachts. This is the moment when we started looking at shipyards as potential partners for cooperation and development of boats that will have their own niche in a market.

After 2 years on development of 60' cat, we have found good solution for higher power - Visedo motors were able to provide us 400kW continuous power – so system could have 800kW in total. With this opportunity we decided to have a look at the concept of power boat. During extensive works we have end up with 57’ monohull that has 2 x 400kW motors, diesel based variable RPM range extender that can provide us steady 390kW of power. With this we should be able to reach ~30kn just on batteries, and ~15kn of cursing speed on range extender only.  

We decided that building process should start relatively quickly. After long time of looking at the good place we decided to start our cooperation with Latitude Yachts based in Riga. It was not an easy task to fins shipyard that can handle such difficult and complicated project. From propulsion point of view we have system that suits super yachts in size of 150’. In the same time, as we were aiming for highest quality, normal shipyards, in our boat size range, were far away form super yacht finishing quality. This is how we ended in Latvia and we are cooperating well.

Boat exterior and all machinery is done. Due to COVID we have delay on making boat ready for first sea trials. We were doing tests of entire system assembled in our lab to make sure that all works fine, and we be sure that software development is going in a right direction. We did test each of our hardware to its maximum operational loads, we overloaded everything. We did gain knowledge on what can happen in many different safety situations. In the end we have made 6 months of dry tests of our system (with assembled hardware). Once we reached moment when nothing else was possible to dry test we have installed all components on a boat in a shipyard.

We have faced fact that large power motors are not widely available. As we did not wanted to go route of development of our own hardware, we decided to limit our propulsion to only 2 x 250kW continuous output. With this available power we have created ultimate design of 60’ catamaran. At this point we realized as well that for boats with massive battery banks, there is a need for high power DC charging system, that is significantly exceeding what was available on automotive market. We started building our team, and looking for a shipyard where we can make our demonstrator come true. It was not an easy task, as we were looking at ultimate design with carbon fibre used on all structural components, and in as many places as it was possible.

Our time scale

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Silent Straits Ltd. Continental office:Ul. Wróbla 6, 02-736 Warsaw, Poland

Advanced Electric Propulsion & Yachts