Welcome to the Land of the TIB bowlines, Alan !
The
third and the
fourth loops have very narrow, one-rope-diameter second collars, a feature I do not like : many stiff ropes will not tolerate such sharp U-turns, and the nubs will remain loose at that point. The
sixth loop uses an overhand knot as its collar structure - so, under heavy loading, it will probably be prone to jamming.
The other three loops are very similar, or even identical, to the "right-" and the "left-handed" Alpineer s and Scot s TIB bowlines, shown at (1),(2), and to your second, TIB, loop, at (3). They have wide, three-rope-diameters nipping loops, and they seem very interesting, secure and simple TIB loops to me. I hope you will tie all the possible variations, and then you will find out easy to memorize tying-in-the-bight methods. As the two
Scot s TIB bowlines and the two
Ampersand bowlines can be transformed the one to the "reverse" of the other (4)(5), I imagine that all those very similar to the
Scot s TIB bowlines loops you have tied can also be transformed to the "reverse" of very similar to the
Ampersand bowline loops.
1.
http://igkt.net/sm/index.php?topic=4697 2.
http://igkt.net/sm/index.php?topic=4517.msg30269#msg30269 3.
http://igkt.net/sm/index.php?topic=4695.msg32300#msg32300 4.
http://igkt.net/sm/index.php?topic=4877.msg31925#msg31925 5.
http://igkt.net/sm/index.php?topic=4877.msg32239#msg32239P.S. I can not find any major differences, or disadvantages, in any of those three loops. The only thing I have noticed is that, at the
first of them, the last curve of the Tail End is more sharp than I would had liked it to be. I always prefer a smooth, fluid path od the Standing Part, all over the knot s nub : a sharp 90-degree turn around one rope diameter, even if it located on its last part, the lightly loaded Tail End, is not what I would had wished.