This topic is burgeoning. I got an email from another Barebow Recurve archer on a similar topic while writing the last post and there are quite a few loose ends that still need to be tied up here. Also, since I pointed out that the cut chart I included in the last post was a “simplified one” somebody just had to see one that wasn’t simplified. So, let’s get that out of the way right now.
This chart includes the fact that on downhill shots, gravity is accelerating the arrows making their arcs flatter and on uphill shots gravity is decelerating the arrows making their arcs more pronounced. For example: a 50 m shot at an angle of 35° uphill would be shot as if it were a 42.3 m shot but if that angle were downhill it would shot as if it were 39.8 m. Note A 35 degree shot is quite extreme by American standards but not so much by European standards. (Europeans like shots you have to tie a rope around your waist so you don’t fall off of the cliff as you shoot from it.) The “simplified chart” has this shot at 41 m which would be a 1 m error either way, not a lot to worry about.
Note that the two charts are arranged differently: one has degrees vertically, the other horizontally. If you thought I would remake one of these for consistencies sake a blog that doesn’t make me a dime, you need to think again.
Onward and Upward
Stringwalking in Barebow makes things different, but the physics of gravity isn’t one of the differences. The simplified cut chart gives a reasonable number for the crawl setting for an “angled” shot. Using the example above, a 50 m shot at a 35° angle (uphill or downhill) should be attempted with whatever anchor and crawl you would use for a 41 m shot.
This is a starting point! You really need to check these things out. For one, when you take a crawl, you are detuning your bow substantially. Different crawls represent different tunes, in effect. This is why tuning for Barebow is different from tuning for Olympic recurve. Even using a “three fingers under” string grip requires a different tiller setting than the more typical Mediterranean string grip (one over, two under).
The more extensive chart is not needed unless your groups compare to those of Compound Unlimited archers, but those “cut distances” need to be checked. (Do I need to say it again?) The second reason they need to be checked carefully is anything greater than a very shallow angle for a shot can distort the archer’s form resulting in quite varied results (depending on the amount of distortion).
There are a number of compensations that Barebow Recurve archers make for these shots. One of those is to open their stance greatly for downhill shots and close them greatly for uphill shots. The open/downhill posture makes room for the bottom limb to go between the legs, instead of hitting the forward leg if a square stance were employed. Opening your stance shortens your draw length which actually helps with those downhill shots (shorter draws make arrows fall “short” which is what we want), but they also make shots more variable and, hence, more difficult. The ideal is keeping your upper body geometry consistent from shot to shot, but this is virtually impossible at higher angles of launch. The net effect of this distortion of the full draw position is to shorten the draw. By using a very closed stance on those difficult uphill shots, the closed stance lengthens the draw to compensate for the draw shortening described above, making the archer more consistent. (If you do not understand this effect, take a very light drawing bow and at full draw tilt up- and downhill and see what happens to your draw length. (You may need a helper to watch your arrow point or set up a video camera.) Hold the arrow level, again at full draw, and swing left and right (in effect changing to open and closed stances). (Go as far as you can.) Do these things, see what happens, they are more explicative than any thousand words you could read!