Which knot will not slip or draw tight under heavy loads?

The double sheet bend is particularly effective for securely joining two ropes, especially when one of the ropes is larger or more substantial than the other. This knot is designed to hold tight under heavy loads and prevents slipping due to its structure, where the loop created by the larger rope wraps around the smaller rope twice before being secured. This additional wrap significantly enhances grip, making it less likely to slip or draw tight under load.

The double sheet bend is advantageous in scenarios where reliable tension needs to be maintained, such as in rigging or in situations where a secure connection is critical. This makes it distinctly suited for uses where heavy loads are involved, ensuring safety and reliability.

In contrast, while other knots like the figure eight knot and the bowline knot have their uses, they may not provide the same level of slip resistance under heavy loads, particularly in the same applications for which the double sheet bend is designed.