Is a splice more permanent and more efficient than a knot when used to join two ropes?

A splice is indeed more permanent and generally more efficient than a knot when used to join two ropes. This is mainly because a splice creates a smooth, strong joint that maintains the strength of the rope, allowing it to bear heavy loads without compromising the integrity of the rope itself. Splices distribute the load across a larger area, reducing points of stress that can occur with knots.

In contrast, knots can reduce the overall strength of a rope due to the way they bend and pin the fibers together. Many knots can also come undone under certain conditions, making them less reliable for securing two lines together over long periods or under strain.

For applications requiring a long-lasting and strong connection, especially in environments where safety and reliability are critical—such as in rigging or sailing—splices are favored. However, in situations where quick adjustments are needed or where the ropes will not be subjected to heavy weights, knots might still be used effectively.