A transom is a flat or curved surface at the stern of a boat where you mount your Mercury outboard motor or your Minn Kota trolling propulsion system. Even though transoms have usually a flat or curved surface, they can also come in different shapes, sizes, and materials depending on the boat's design and purpose.

The transom also houses the bilge pump, which is a device responsible to remove water that accumulates in the bilge.

Aside from mounting boat engines, boat transoms play a crucial role in the structure of a boat. They provide stability and structural support to the boat’s stern by distributing the forces and loads created by the engine.

Aside from being mounted or stored with devices, it can also be used to help a boater in stern anchoring. Some boats have an attachment bracket where one can secure the anchor when the boat is anchored from the stern. This allows the boat to be anchored in a specific position, which is especially useful during fishing excursions or when precise positioning is required.

The design of a boat's transom is essential to its performance, handling, and speed. There are various types of boat transoms, each with unique characteristics and applications. Here are some of the common types of boat transoms you can find in various types of boats:

Conventional Transom

The conventional transom is the most common type of boat transom since they are suitable for almost any type of boat. It is a flat, rectangular structure that provides a stable and sturdy platform for the boat's motor. They provide excellent weight distribution and stability, making them ideal for cruising and recreational boating. However, they may not be suitable for high-speed boats that require a more specialized transom design. The conventional transom is usually made of wood, aluminium, or fibreglass. It is versatile and easy to construct, making it a popular choice for both large pleasure boats and small fishing boats.

Cutaway Transom

The cutaway transom is a modified version of the conventional transom. It is designed to allow water to flow freely under the boat's hull, reducing drag and increasing speed. It also provides a smoother ride, making it ideal for rough waters. The cutaway transom is common in racing boats and high-performance boats where speed and agility are essential.

Notched Transom

The notched transom is similar to the cutaway transom, but instead of a smooth curve, it has a "V" shaped cut in the centre. The design provides improved handling and maneuverability, which means it lets the boat ride higher in the water which reduces drag and improves speed even in rough waters. Notched transoms are common in offshore fishing boats and high-speed boats.

Step Transom

The step transom is a unique design that includes a step or series of steps built into the transom. The steps help to break up the water flow and create a cushion of air, reducing drag and improving the boat's performance. It also acts as a ladder for easy access to the boat from the water. Step transoms are common in offshore racing boats and high-performance boats.

Reverse Transom

The reverse transom, also known as a "Euro-style" transom, is a design that slopes inward towards the boat's hull which creates a more streamlined and modern look. The reverse transom provides improved stability and handling at high speeds and rough waters. Reverse transoms are common in offshore racing boats, high-performance boats, and luxury yachts.

Swim Platform Transom

A swim platform transom is a design that includes a platform built into the transom. The platform provides a safe and convenient area for passengers to board and exit the boat, as well as an area for swimming and water sports. Swim platform transoms are common in pleasure boats such as the Freestyler Quintrex boat and recreation yachts. The platform on a swim platform transom is usually made of teak, fibreglass, or aluminium.