The simple Simon under bend is a knot belonging to the category bend. It was invented by Harry Asher. It is more secure than the similar Simple Simon over and more effective with quite large differences in thickness of the two ropes.Harry Asher, Alternative Knot Book, Sheridan House (August 1989).
The simple Simon under holds well even with different sized ropes, or slippery synthetic ropes.Geoffrey Budworth, The Ultimate Encyclopedia of Knots & Ropework (Anness Publishing Ltd., 1999, 2007), 73.
Comparison of Sheet bend, Simple Simon over and Simple Simon under
Instructions Tie as shown in the images. Note that, as in the sheet bend, the two running ends should emerge on the same side of the knot.
See also Knot List of bend knots List of knots
References