Transom knot

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Transom knot
RelatedStrangle knot, Constrictor knot, Square lashing
Typical useLight-duty right-angle lashing
ABoK#385, #1182, #1255, #3372

The transom knot is a simple lashing knot used to secure two linear objects, such as spars, at right angles to each other.

Relation to other knots[edit]

While often described in relation to the constrictor knot, the underlying structure of the transom knot is the strangle knot.[1][2] The introduction of a second, perpendicular spar into a loose strangle knot tied around another spar will illustrate this point. In relation to the upper spar, the crossings of the knot come to very closely resemble those of a constrictor knot.

Perhaps because of this Clifford Ashley described the transom knot as both "a modification of"[3] and "closely related to"[4] the constrictor knot. Despite these descriptions the transom knot is consistently illustrated in The Ashley Book of Knots as being based on a strangle knot.


Suggested for binding kite sticks by Ashley,[5] it is useful generally as a light-duty or temporary square lashing. To reinforce, a second transom knot can be made on the opposite side and at a right-angle to the first.[2][5]


  1. ^ Budworth, Geoffrey (1985) [1983], The Knot Book, New York: Sterling Publishing, pp. 63–65
  2. ^ a b Warner, Charles (1992), A Fresh Approach to Knotting and Ropework, NSW, Australia, p. 83, ISBN 0-9592036-3-X
  3. ^ Ashley, Clifford W. (1944), The Ashley Book of Knots, New York: Doubleday, p. 62
  4. ^ Ashley, p. 215
  5. ^ a b Ashley, p. 225