icon_arrow_down icon_arrow_left icon_arrow_left_large icon_arrow_right icon_arrow_right_large icon_arrow_up icon_bullet_arrow icon_call icon_close icon_facebook icon_googleplus icon_grid_off icon_instagram icon_login icon_mail icon_menu icon_message icon_minus icon_pinterest icon_plus icon_quote_end icon_quote_start icon_refresh icon_search icon_tick_on icon_twitter icon_video_play icon_youtube

Sign up to our mailing list for the latest Boat International & Events news.

SIGN UP

Missing your newsletter?

If you’ve unsubscribed by mistake and would like to continue to hear about the latest Boat International & Events news, update your preferences now and let us know which emails you’d like to receive.

UPDATE NOW
No, thanks

Building the cutting edge sailing yacht Athos

With 300kW on the thrusters alone, and taking into account efficiency losses and the hydraulically powered controllable pitch propellers, Athos now had a simultaneous hydraulic power factor in the range of 450kW.

‘By this time, we had prepared a hull construction and layout for a system one fifth of the size so we had to rethink the proposed design, working everything around the entire installation to keep it all concealed,’ says Zijlmans. ‘The pumps on the main engines and generators are huge and the piping needed to transfer and hold the pressure involved in such a vast system power is tremendous.’

Some 80mm in circumference, the pipes and their brackets had to be installed in a way that would be both resilient and sound insulating. While such heavy duty gear may be common in the commercial shipping sector, the restrictions on a luxury yacht where real estate is so precious – and peace and quiet so valued – made this a colossal challenge.

A similar dichotomy between two different maritime worlds can be seen in another of the owner’s innovations, which had been a key feature of the original specification.

Athos has double redundancy of almost every system on the boat, divided into port and starboard systems. Twin main engines drive two propellers, while two 90kW diesel gensets and two shaft generators provide a parallel power supply (add in the emergency generator aft and you have five gensets on a sail yacht). The shaft generators are another relatively common feature in the shipping world that you will not find on many superyachts.

The owner’s requirement for Athos to have dynamic positioning (DP) is also very unusual.

‘As far as we know, this is a first on a sail yacht so we had no reference point,’ says Zijlmans. ‘It is not the DP system itself that is complex, it’s the communication of the signals within the system and how parts of the yacht respond that are the big deal. The installation itself is driven by GPS signals, but the desire to have it hydraulically operated was something altogether new.

‘Finding a solution entailed a great deal of discussion with the yard, the DP installation manufacturer, the hydraulic components and engine controls suppliers, and the naval architects. In addition to being able to enjoy quiet without anchoring up, a secondary benefit is that it will be possible to manoeuvre Athos using a “simple” joystick.’

Upgrade your account
Your account at BOAT International doesn't include a BOAT Pro subscription. Please subscribe to BOAT Pro in order to unlock this content.
Subscribe More about BOAT Pro