Straight bevel gears in boats serve several important functions:

1. **Power Transmission**: They transfer power from the boat’s engine to the propeller shaft, enabling the boat

to move through the water.

2. **Direction Change**: Bevel gears change the direction of the drive from the engine’s output shaft to the

propeller shaft, which is typically at a right angle to the engine’s orientation.

3. **Torque Conversion**: They convert the high-speed, low-torque output of the engine into a lower speed with

higher torque suitable for propelling the boat.

4. **Efficiency**: Straight bevel gears are designed to be efficient in transferring power, minimizing energy loss

during the transmission process.

 5. **Reliability**: They are robust and reliable, capable of handling the harsh marine environment and the constant exposure to water and salt.

6. **Compact Design**: Due to their conical shape, straight bevel gears can be compactly integrated into the boat’s propulsion system without taking up a lot of space.

7. **Versatility**: They can be used in various boat types, from small outboard motors to larger inboard systems and in different marine applications such as steering systems and winches.

8. **Compatibility**: Straight bevel gears are compatible with other types of gears and can be part of a more complex gear train if needed.

9. **Ease of Maintenance**: While they require proper alignment and lubrication, straight bevel gears are generally straightforward to maintain and replace if necessary.

10. **Cost-Effectiveness**: They offer a cost-effective solution for power transmission in boats, especially for applications that do not require high speed operation.
Straight bevel gears are a critical component in the propulsion systems of boats, ensuring efficient and reliable power delivery to the propeller, which is essential for the boat’s performance and maneuverability.