Have you ever experienced a situation where the motor speed rises suddenly but the boat speed does not increase accordingly? And the fuel consumption is also higher than usual? What is going on here?
Today, Trodat will answer your questions, in fact, it is all caused by the propeller idling!
Before we understand the problem of thruster idling, let's understand the thruster. A propeller is a device that converts any form of energy into mechanical energy. It generates thrust by rotating blades or jets of air (water) and can be used to drive a vehicle forward or as a power source for other devices such as generators.
According to the different vehicles, there are aviation propulsion, space propulsion, ship propulsion; according to the different principles, there are propeller propulsion, jet propulsion, water jet propulsion, special propulsion.
These conditions are prone to the thruster idling:
01. When the weight is unloaded
When the draft line is lowered and the propeller is too close to the water surface, the phenomenon of air roll often occurs. Cargo ships and fishing boats in particular need to pay attention to this situation, which is likely to occur after unloading.
Phenomenon: large revolutions during regular sailing, large fuel consumption, spraying water to the rear
Solution: Lowering the installation position of the outboard engine and increasing the distance between the propeller and the water surface will solve the problem. The propeller position should be between the bottom line of the boat and 25mm below the bottom line of the boat. If the boat is heavily loaded, it is important to determine the outboard hanging position according to the load.
02 When spinning
When there are multiple propeller outboards, the hull rotation will tilt the hull and the outer propellers will be too close to the water surface, so it is easy to produce the air roll phenomenon. The larger the spacing between outboard engines, the more attention is needed.
03 When sailing on the crest of a wave
When sailing on the crest or tip of a wave, the propeller is too close to the water surface and is prone to the phenomenon of air curling.
04 When sailing in shallow water
When the bow and stern are tilted too much, the propeller is too close to the water surface, and the air is easily rolled.
05 Attachment to the bottom of the ship
When the bottom of the boat is attached to marine life or garbage, it will be uneven, and the thrusters will have difficulty in catching the orderly water flow, so the turbulent flow above the thrusters will be caught in the air.
06 Boat's bottom shape
If the bottom of the boat is designed with unequal planes, air will be drawn in easily, and the propeller will be affected by this, and the air will be drawn in and the boat will spin.
07 Protrusions on the bottom of the boat
If there is a fish finder signal port (penetration type) or fish finder sensor on the bottom of the boat, the air sucked in by these devices will cause the thruster to idle.
08 Deformed or defective thrusters
Deformation or damage of the thruster that prevents normal water flow may also be a cause.
Various phenomena of thruster idling and solution measures
