What is the correct transom height for my outboard engine?
On average boats, it is best to mount the engine so the cavitation plate is approximately 1″ below the bottom of the keel, or 1″ below the bottom of boats without keel. For racing boats, better speeds can be attained by raising the engine to reduce lower unit drag and exhaust back pressure. Best transom height can only be determined by experimenting . . . get the engine as high as possible, or to the point just before the propeller cavitates excessively.
