Law Enforcement BoatWhat should I pay attention to when sailing at night?

　　Law Enforcement BoatWhen going out at night, the speed of the law enforcement boat, the equipment on the yacht, light signals and weather conditions should be considered.

1. Cautions for sailing boats with poor eyesight:

It is necessary to use telescopes, compasses, radars, VHF and other navigational aids to strengthen the gap. In mountainous rivers or narrow rivers, searchlights can be used to help navigate without hindering other ships.

2. Accurately locate the ship at any time, grasp the turning point and lifting point at night, so that the ship can keep on the planned route or in the "landing" state.

3. When passing through prominent shore openings, stone beams, hidden reefs, rapids or dangerous tips, it is necessary to accurately grasp the terrain, beach conditions and water potential, use the steering wheel correctly, and take safety measures.

4. There are few objects and lights in the wide reach (especially the estuary), and the lights are mixed at the fork. Flood period floodplain, light distance and distance staggered, difficult to identify. To memorize the name of the ship, light quality, the distance between the two beacons, sailing time and the relative position required by the ship, in order to determine the position of the ship, course and channel direction, to avoid errors.

5. In the dark night, when sailing near the shore, it is necessary to timely grasp the significant objects (topography, landform) to correct the ship position. Keep the ship line slightly parallel to the shore line, turn the rudder and lift the head in time according to the terrain characteristics, and the shore distance should be greater than the shore distance during daytime navigation.

6. In the winding, narrow, strong cross-flow of the river, it is forbidden to let the ship meet, but to choose a wide channel, good water flow. When avoiding other ships, the horn should be sounded as soon as possible, and flashing lights showing the direction of avoidance should be displayed.

To thinkLaw Enforcement BoatCarrying out good work and regular inspection of law enforcement boats is a simple and important way of yacht maintenance. Daily cleaning can not only keep the law enforcement boats clean and beautiful, but also reduce long-term surface wear and yacht marks. Above the waterline, the yacht can be maintained by waxing. Below the waterline, antifouling paint is required. As far as possible, the cleaning process should not be considered as contaminated water.

Currently mostLaw Enforcement BoatThey all use the principle of water turbines, but the power comes from people stepping on pedals connected to the water fan through bearings. During operation, it needs to be exposed to water for a long time. At this time, due to the influence of external factors, the hull will slightly deteriorate, and a small amount of changes will slowly accumulate, sometimes causing serious damage. The effect of temperature on the decay of seawater is enormous. From a kinetic point of view, an increase in temperature accelerates the decay of the hull.

On the other hand, with the increase of seawater temperature, the solubility of oxygen in seawater is lower, which promotes the formation of shield carbonate, and then slows down the corrosion of steel in seawater. However, in the case of normoxic seawater, temperature is a stress factor affecting decay. This is because when the oxygen content is sufficiently high, it is the diffusion speed of oxygen, not the oxygen content, that controls the response speed of the cathode. When the hull is passivated in seawater, the stability of the passivation film decreases with the increase of temperature, and the sensitivity of pitting corrosion, stress corrosion and leakage corrosion increases.

Marine electric propulsion includes DC propulsion and AC propulsion. AC propulsion is driven by an AC motor. Although the AC motor has the advantages of large output power, high speed, simple structure, low cost, small size, and reliable operation, it was difficult to adjust the speed due to the technical limitations at the time. There are also some small surface or underwater vessels that use diesel engines or steam turbines to drive generators to generate electricity and turn propulsion motors to propel the vessel. Law enforcement boats should regularly check the oil level in the engine. Regularly check the coolant condition. Check the fan belt regularly. In the start-up state, check the seawater filter every 25 hours. Check the degree of lubrication of the nozzle and steering oil cup.