Home / TSD Surface Drive / TSD Surface Drive / BH850
BH850 is a surface drive system with a diameter of 850/800mm, with an engine power between 600-1000hp, and the suitable boat weight is 15-90T

Design Advantage

  • A pair of TDS surface drive can lift and steer system
  • A pair of high anti-corrosion, high toughness and strength two-way special stainless steel surface perforated propellers
  • Hydraulic and steering equipment
  • The body i s made of all 316L anticorrosive stainless steel
  • Indicators and sensors
  • Double hydraulic cylinder
  • Two kinds of adjustable movable and fixed semi-submerged propeller systems
  • Universal ball cage connection design

Performance Advantages

  • The water intake of the surface piercing propeller is half of the water intake
  • 15% to 30% faster than traditional systems
  • 15% to 30% increase in fuel efficiency
  • The propeller i s ventilated to the water surface, thereby reducing noise and destructive hull and pillar erosion.
  • The maintenance requirements are low, and the propeller immersion can be adjusted in progress.

TDS Surface Drive Certification

Our propulsion system can pass the certification of major classification societies: ABS, CCS IS09001:2015/IS09001:2016 certification, and its activities incIude: marine supporting products (movabIe surface drive, fixed surface drive, gear box) design, development and manufacturing.
Product Paramater
Model Adaptable blade diameter Adapted power Input torque Input RPM Dimensions Weight

Suitable ship weight

Standard accessories

BH450 400/450mm 60Hp-130Hp 500 N.m 3000r/m 950X320X660mm
Single machine 1.5T
Dual machine 2.5T
Universal drive shaft/ 12V hydraulic lifting station/ oil pot/ oil shortage alarm light/ anti-corrosion zinc block
BH500 450/500mm 100Hp-200Hp
800 N.m
3000r/m 1040X312X600mm
Single machine 2T
Dual machine 4T
Universal drive shaft/ 12V hydraulic lifting station/ oil pot/ oil shortage alarm light/ anti-corrosion zinc block
BH550 550mm 150Hp-250Hp
1000 N.m
2800r/m 1168X770X550mm
Single machine 3T
Dual machine 6T
Universal drive shaft/ 24V hydraulic lifting station/ oil pot/ oil shortage alarm light/ anti-corrosion zinc block
BH600 600mm 200Hp-300Hp
1600 N.m
2500r/m 1285X826X600mm
Single machine 5T
Dual machine 11T
Universal drive shaft/ 24V hydraulic lifting station/ lift table/ oil pot/ oil shortage alarm light/ anti-corrosion zinc block
BH660 660mm 250Hp-400Hp
2500 N.m
2200r/m 1399X877X660mm
Single machine 6.5T
Dual machine 16T
Universal drive shaft/ 24V hydraulic lifting station/ lift table/ oil pot/ oil shortage alarm light/ anti-corrosion zinc block
BH750 660/750mm 400Hp-600Hp
3600 N.m
2000r/m 1468X924X750mm
Single machine 11T
      Dual machine 22T          Four machine 45T
Universal drive shaft/ 24V hydraulic lifting station/ lift table/ oil pot/ oil shortage alarm light/ anti-corrosion zinc block
BH850 850/800mm 600Hp-1000Hp
5500 N.m
2000r/m 1687X1030X850mm
      Single machine 15T           Dual machine 40T      Four machine 90T Universal drive shaft/ 24V hydraulic lifting station/ lift table/ oil pot/ oil shortage alarm light/ anti-corrosion zinc block

Download List

Name Introduction Size Downloads Update Category Thumbnail Copy Link Download
BH850.png 639KB 83 2024-04-01 Surface Paste Drawings download Copy Link Download

Recommended TF Series Gearbox



     Input speedr/min


     Input power K/w


     Transmission capacity kw/r/min


     (Increase) Reduction ratio


     Bearing propeller thrust kN


     Center distance


     Net weight (kg)


     Manipulation form

     Electronically controlled or push-pull flexible shaft

     Input connection

     Housing SAE 1#,  flywheel SAE 14

Related Installation Cases

Plan Communication

TSD Surface Drive specializes in high-durability surface-piercing propellers and advanced marine surface drive systems specifically designed for high-speed vessels. Once the essential boat parameters are received from clients, TSD Surface Drive's expert engineers conduct comprehensive technical evaluations to assess feasibility and ensure precise fitment. Leveraging state-of-the-art analysis tools and methodologies, they meticulously match the most suitable surface drive systems, ensuring optimal performance, efficiency, and compatibility. Their commitment to innovation and quality guarantees that their products meet the highest industry standards, providing reliable and robust solutions for all high-speed marine applications.

Designing Process

Based on the specific specifications and requirements provided by our clients, TSD Surface Drive's engineers deliver comprehensive and customized solutions to meet customer needs. Our expert team meticulously designs and engineers complete systems, including engines, gearboxes, and surface drives, ensuring seamless integration and optimal performanceEach system can be tailored to match the precise requirements of individual projects, guaranteeing the best possible fit and functionality.

Furthermore, TSD Surface Drive is committed to supporting our clients throughout the entire planning and implementation process. We provide detailed 2D drawings, offering clear and precise visualizations of the proposed systems. This ensures that clients can fully understand the configurations and make informed decisions. Our dedication to quality and precision in every aspect of our production process underscores our commitment to delivering reliable and robust solutions for high-speed marine applications.

Production Processes

After assembling the TSD series surface drive propulsion devices, the company implements rigorous quality control protocols to ensure optimal performance and reliability. This process includes precision laser inspections, as well as static and dynamic balance assessments of the machined blades.
Furthermore, the assembled units undergo specific duration idle tests and dynamic load evaluations. To guarantee durability, the company conducts comprehensive load operation tests on both the device and blades within a specially constructed circulating pool. An essential component of our quality assurance process is the bench joint debugging test of the integrated hydraulic control system, which is critical in validating the reliability and overall quality of our products.

Packing and Transportation
Our TSD surface drive systems are securely packaged in export-grade wooden crates that comply with international shipping standards. We offer flexible transportation options, including sea, air, and land, tailored to your specific needs. If you have any special requirements, please contact us in advance to ensure we can accommodate your request.
  • Q The correct position for installing a surface drive system

    A The correct position for installing a surface drive system:
    The nut on the propeller blade should be positioned 10mm below the boat's transom extension line. However, for some light-loaded high-speed boats, the position may vary slightly, such as being 20mm below the transom extension line.
    The main engine and the transmission shaft should form a straight line, not a large angle. If the engine is revved up and the prop system remains unchanged, the universal joint cage of the coupling will have an angle instead of a straight line, which can cause damage to the coupling cage over time.
    While tilting the engine, the half-immersed propeller and the shaft should also be tilted at the same angle to form a straight line.
  • Q How long is the warranty period for surface drive systems?

    A The warranty period for surface drive systems is typically 18 months, which means that within this period, if there is any malfunction or damage to the parts, the customer can return the damaged parts to the manufacturer for repair or replacement. During the warranty period, the manufacturer will provide free parts and technical support. If the equipment fails or is damaged outside the warranty period, the customer needs to purchase the corresponding parts from the manufacturer and the manufacturer will provide technical support. During the warranty period, only damaged parts are covered by the warranty, and not the damage caused by normal use, which the user will have to bear. The responsibility for shipping costs will also differ depending on whether it is within or outside the warranty period, and specific details need to be checked in the manufacturer's warranty terms and conditions.
  • Q Installation angles for BG and BH surface drive systems

    A Surface drive systems typically come in two installation types: BG and BH. These installation types have different installation angles.
    The installation angle for a BG surface drive system is 45 degrees.
    The installation angle for a BH surface drive system is 10-13 degrees.
    If the installation angle is outside of these ranges, a stainless steel box is needed to connect the surface drive system.
  • Q How long is the service life of the surface drive system?

    A The lifespan of a surface drive system depends on various factors, such as the usage environment, frequency of use, maintenance, and so on. In a good environment, the lifespan of a surface drive system can usually be over 10 years. However, in extreme environments, such as waters with high humidity up to 95%, water temperature up to 38, and high salt content, the lifespan of surface drives may be shortened to around 5-6 years. Regular maintenance is necessary to ensure the normal operation and extend the lifespan of the surface drive system.
  • Q How to Maintain Surface Drive Systems and Prevent Corrosion?

    A Cleaning: Regularly clean the surface drive system with soap and water to prevent the formation of marine organisms and scale. Lubrication: Replace the oil seal and lubricating oil every 1000 hours. This will help prevent excessive wear on the surface drive system.
    Replace the corrosion-resistant zinc block: The surface drive system is usually equipped with a corrosion-resistant zinc block to prevent seawater corrosion and weaken the corrosion of the drive system by seawater. If the zinc block is severely corroded, it needs to be replaced with a new one.
    Regular Inspection: The surface drive system should be regularly inspected to ensure that all parts of the drive system are in normal working condition. The inspection should include wires, cables, and all connection components.
  • Q Difference Between Surface Drive Systems with different Numbers of Blades

    A 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.
  • Q The Difference Between BH and BG Surface Drive Systems

    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.
  • Q How to choose the gear ratio for a gearbox?

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

    A 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.
  • Q The Operating Principle of Surface Drive Systems

    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.

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