Skeg
That or the skeg (synonyms: rudder fin , rudder hoe or keel ax ) is the slender outlet of the underwater hull or a rigid fin on the stern of a boat or ship in the longitudinal direction. In older designs, the rudder is attached to it. In modern boats it only serves to protect the rudder and improve its flow. The most important property of modern ships is the course stability given by a skeg for straight travel. That is why, for example, most screwdrivers have a skeg located in the middle between the shafts.
Twinskeg
A special feature is the so-called Twinskeg, which has two skegs next to each other at the stern.
kayak
In sea kayaking , a skeg is usually a fold-out, adjustable fin under the stern - with a sliding mechanism next to the seat hatch. Course stability can be increased with the skeg. In windy conditions, the lateral plan of the kayak can be corrected by adjusting the skeg so that the boat remains course-neutral and the respective windward or leewardness is corrected. Since course corrections with the paddle can be omitted, this trim measure leaves more power for propulsion.
