Question 1

Difference Between Surface Drive Systems with different Numbers of Blades

Accepted Answer

The main difference between surface drive systems with different numbers of blades is their performance range and adaptability to different load conditions.
Regarding the specific blade number selection, a 4-blade system generates less propulsion force and is suitable for low-speed and light-load situations. A 6-blade system provides more propulsion force and is suitable for full-load conditions. A 5- The blade system can balance and consider both light and full-load situations, providing moderate propulsion force and higher speed, thus being widely used in different types of vessels.

Question 2

The Difference Between BH and BG Surface Drive Systems

Accepted Answer

BH and BG surface drive systems differ mainly in their mobility. BH surface drive is mobile, allowing it to turn left and right and move up and down to avoid damage from underwater obstacles, thus increasing the lifespan of the propeller. On the other hand, BG surface drive is fixed and lacks the up-and-down movement function, but it shares the same functions as BH surface drive. The advantage of BG surface drive is its relatively lower cost-effectiveness, as it does not require moving parts, resulting in lower manufacturing costs.
In terms of installation, BG surface drive requires an angle of approximately 45 degrees at the stern of the boat for installation. If the angle difference is too great, an additional box must be purchased to adjust the installation angle. BH surface drive, on the other hand, has no special installation requirements.

Question 3

How to choose the gear ratio for a gearbox?

Accepted Answer

The gear ratio of the gearbox is usually adjusted based on the torque of the surface drive. The reduction ratio = propeller torque: engine torque; for example, if the propeller torque is 600 and the engine torque is 400, then the reduction ratio of the gearbox is 600:400=1.5:1.
When matching a gearbox for customers who already have an engine, it is necessary to have a detailed understanding of the engine's rated power, torque curve, maximum torque, and other data. These data will help determine the accurate reduction ratio of the gearbox.
It should be noted that the reduction ratio of the gearbox is generally determined before leaving the factory and cannot be adjusted arbitrarily during use.

Question 4

How to choose an engine to use with a surface drive system?

Accepted Answer

The following factors need to be considered: Power output: A surface drive system requires a high-speed and efficient propeller, so an engine with a high speed of 2000 RPM or more should be selected.
Inboard use: A surface drive system needs to be connected to the engine and gearbox for inboard use, so an engine suitable for inboard use should be chosen.
Reliability and maintainability: A reliable and easy-to-maintain engine should be chosen to ensure stability and reliability in long-term use.
Environmental friendliness and fuel efficiency: An engine that meets environmental standards should be selected, and one with high fuel efficiency can reduce fuel consumption and environmental impact.

Question 5

The Operating Principle of Surface Drive Systems

Accepted Answer

Surface drive systems are a type of marine propulsion system that utilizes the pressure difference between the hull and the water surface to generate propulsion. During low-speed operation, the propeller blades are fully submerged and push the vessel in a conventional manner. However, during High-speed operation, the hull automatically lifts, exposing half of the propeller blades to reduce water resistance and increase propulsion force.
When the propeller blade height needs to be adjusted, the crew can use lift buttons to control the blade position to adapt to different navigation conditions. Surface drive systems are widely used in high-speed yachts, military ships, commercial vessels, and other fields to increase ship speed and reduce fuel consumption.

Q Difference Between Surface Drive Systems with different Numbers of Blades

Q The Difference Between BH and BG Surface Drive Systems

Q How to choose the gear ratio for a gearbox?

Q How to choose an engine to use with a surface drive system?

Q The Operating Principle of Surface Drive Systems

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