Quote:
Originally Posted by Bug Fisher
Becuase the 101 has a ring-eye, meaning that the eye is not turned down or up, it gives more hooking capacity or overall clearance. On small hooks, having the turned-down eye can interfere with the hook's ability to set.
Basically, what Josh said.
Wayne
|
I appologize for this long answer. I wanted it to be as complete as possible but that led to a very long post.
Ok, now I understand. i didn't want to assume before I gave my opinion on small hooks.
There are actually 4 factors on how to get the best "hookability" with small hooks. One is the issue of
hooking gape which was brought up above. Two others are the issue of
hooking angle and
penetration angle (yes, it is called penetration angle setting me up for an easy joke). The fourth factor is
hook offset.
What follows is my opinion but it is backed by some research and a bit of logic. If you have other views, that's OK but I'd be interested in the logic behind those opinions.
First I'd like to discuss
hooking angle and
penetration angle because many fly fishers think they both depend on the position of the hook eye.
Hooking angle is the
angle of pull on the hook by the leader at the hook set. The common perception is that an upward angle is best to drive the point into the fish because it rotates the hook point into the fish. If this is true then an up eye hook should give the best hooking angle. However, the angle of pull is not determined by the angle of the eye. It is determined by the relationship of the rod tip to the hook eye. For example, one would think that a down eye hook would cause the angle of pull to be "down" on the hook, but the angle of pull is actually up if the rod tip is above the level of the hook when the hook set occurs. See pg. 178 of
Designing Trout Flies by Gary A. Borger. So eye angle has no effect on hooking angle. Since almost all hooksets occur when the rod tip is above the fly, all hooking angles are in an upward direction.
Penetration angle is the angle of the hook point as it penetrates the flesh of the fish. A steeper angle should drive the hook deeper. When you place an up eye hook agaisnt a flat surface, it will have a steeper angle with respect to the surface than the down or straight eye hook because the eye end of the hook rests on the surface a bit closer to the hook point.
But I beleive this is a false analogy. I think any effect of the hook eye on penetration angle is very, very minor. The reason is that the penetration angle does not stay constant as the hook on flat surface illustration would sugggest. Once the hook point penetrates flesh, the hook pulls on the flesh deforming it and simultaneously the hook rotates in line with the angle of pull of the line. The eye of the hook no longer rests nicely at a 90 degree angle to the flesh as it does on the flat surface.
The angle of pull on the shank and the hook point are pretty much equal when the hook eye does not rest on a flat surface. I believe that this angle of pull drives the hook point further into the flesh at pretty much the same penetration angle which is determined by the angle of pull on the eye rather than the angle of the eye on the hook.
Hook offset is the displacement of the hook point off to the side of the centerline of the hook shank. This reduces the the blockage of the penetration of the hook point by the hook shank. So for small hooks, an offset hook will have better hookability.
This brings us back to
hooking gape. Some fishers believe that a down eye hook somehow "narrows" the hooking gape and negatively affects the hooking ability of the pattern. That is not true either. The gape is the distance between the hook shank and the point and is not determined by the direction of the eye. What narrows the hooking gape is the material that is tied onto the hook at the location of the gape.
When we tie material on a hook shank, this material narrows the distance from the hook point to the hook shank, all along the shank up to the hook eye. Since there is no material on the hook eye, this distance remains constant. But with material and tying thread abutting the hook eye, the difference in distance from the hook point to the eye and the distance from the hook point to the material just behind the eye varies very little from a straight eye or down eye hook. It's pretty much a wash. So even if the distance from hook point to hook eye affects "hookability", the difference between a down eye and a straigth eye or up eye hook is minimized when the material on the shank decreases the "effective distance" all along the shank.
The best way to increase hooking in small flies use the shortest hook with the widest gape with or without a offset point. I use a Tiemco TMC 921 when I can find them. It is a 2XS 1XF hook so that you get a short hook without the wire being too heavy for a dry fly.
If we compare a size 20 TMC 101 with a size 18 TMC 921 we will find that both have the same shank length, that of a size 20 fly. The TMC 101 will have the wire guage of a 21 hook because it is 1XF and the 921 will have the wire guage of a 19 hook. The hooking gape of the TMC 101 will be a size 20 gape but the 19 will have a size 18 gape. So the
TMC 921 will be stronger and will have a 2 size wider gape than the comparble length TMC 101. The 921 has good hooking characteristics and is a strong hook for its length. If you put the 921 side by side against other hooks you will find that it is consistently shorter and therefore can tie smaller patterns that the size indicates. For example, if it put a TMC 921 size 18 against a Mustad size 20, they should be the same length but the 921 will be shorter and have the advantage of a much wider gape.
I also use a Daiichi 1640 which is a 2XS hook with an offset point. It has a straight eye for those of you that still think this is important.