Black Sea Yachts
Survey boat BSY 40 Dolphin Electro
The measuring boat equipped with a multi-beam measuring complex is intended for:
- area sounding of depths on ship routes, shipping canals, port waters, at berths, at the base of dams and coastal ones, in dredging areas for navigation and operational purposes;
- hydrological studies;
- prompt processing of received data on board the vessel.

The proposed 12-meter aluminum boat of the BSY-40 “Dolphin” Electro project for surveying work involves the use of two propulsion schemes:
- one diesel engine with shaft and propeller for cruising speed over 15 knots
- two electric outboard engines.
Specification
description
Sea boat, single-deck, with a deckhouse and aft cockpit, with the possibility of use in winter, with the exception of ice periods. The roof of the cabin extends into a hard canopy over the cockpit. The hull contours are designed in such a way that the boat has good performance when moving, both at high and low speeds. At the bow the hull has a deep V, and at the stern there is a slight deadrise with a smooth rise of the buttocks in the stern. From the bow, the hull has an extended wave breaker, which stretches almost to the stern. A redan is installed in the bottom part. To improve directional stability, a keel skeg fin will be installed on the bottom.
The forward part of the cabin glazing will be reverse sloped to ensure good visibility without glare. Windshield wipers will be installed on the windshield. The glazing of the cabin will be made of double-glazed windows of appropriate thickness, which will prevent glass fogging in cold weather and create comfortable conditions in summer. On both sides of the cabin there will be passages to the bow limited by railings.
Deck plan
Description of interior layout:

The forward section of the deckhouse provides a helmsman's seat on the starboard side. Next to it is the gangway to the interior. On the left side in the bow there is a U-shaped sofa for 6 seats with a table. The sofa can be used as a sleeping place. On the port side in the aft part there is a hydrographic equipment operator's seat. On the starboard side in the aft part of the deckhouse there is a galley table with electric cooker, refrigerator and sink.
Under the galley table there is a 70 litre refrigerator, placed drawers for food. A microwave oven will be fixed above the table. In the aft bulkhead there is a door for access to the aft cockpit. Seating is provided in the cockpit.
There are two small cabins in the interior. There is a double cabin forward. To the right of the gangway is a bathroom with shower. On the port side aft there is a second double cabin. The cabins are equipped with lights, sockets, beds, drawers for belongings.
On the starboard side opposite the cabin under the wheelhouse there is a technical room for batteries, chargers, inverter, boiler, automatic fire extinguisher, pumps and other equipment. The entrance to the technical room is from the deckhouse. In the deckhouse passage there is a hatch to the engine room. The engine room contains the main engines, diesel generator, air conditioner compressor, diesel water heater, and other equipment
Characteristics can be changed to suit the Customer's needs
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RATIONALE FOR USING ONE MAIN ENGINE AND TWO OUTBOARD MOTORS
Sounding work requires a vessel speed of 5-6 knots for a long time while maintaining an accurate heading to minimize the number of passes. Using a powerful diesel engine at low speeds for a long time will lead to increased vibration, wear of some components due to lower speeds, and relatively increased fuel consumption due to the need, in addition to useful work for the movement of the vessel, to also spend work on rotating the masses of mechanisms in a powerful diesel engine. If you use two stationary engines for movement, and only one engine is turned on for sounding, then it will be difficult to keep the boat on course due to the reactive torque of the propeller and the need to keep the rudder slightly shifted to one side. This will increase driving resistance and increase fuel consumption.

The proposed 12-meter aluminum boat of the BSY-40 “Dolphin” project for surveying work involves the use of two propulsion schemes:
- one diesel engine with shaft and propeller for cruising speed over 15 knots
- two electric outboard engines.

The use of two propulsion systems has a number of advantages:

One main engine will be used to propel the boat during transitions to measurement points. From the moment the measurement site is reached, the main engine is switched off and all maneuvers are performed by electric motors.

This increases the service life of the main engine, and also results in significant fuel savings.

To move the boat in measurement mode, it is proposed to use low-power outboard electric motors, which will receive energy from Li-Po batteries, which, in turn, will be charged through chargers from a diesel generator. The power of the diesel generator can be within 15-20 kW. The estimated battery capacity could be 5-10 kWh. Voltage 48V. It is proposed to use solar panels with a power of 1-1.5 kW on the boat, which will additionally save diesel fuel when moving during measuring work. Modern electric motors are simpler in design than internal combustion engines, do not have a brush mechanism, and have high torque from zero speed.

Advantages of using electric propulsion:

- high controllability at low speeds due to variable thrust vectoring;
- high energy efficiency due to the use of a low-power diesel generator;
- additional recharge of batteries from solar panels;
- low vibration and noise;
- reliability;
- high directional stability;
- high protection from old nets, algae and other underwater obstacles (during measuring work, the outboard engine can be raised and easily cleared of algae, nets, etc.);
- at high speeds, the outboard engines are raised and do not create additional resistance to movement.
Examples of interior solutions