Hi. I've been out for some days, so please excuse me for not answering before.
I've just completed the "viscosity" entry. Now I'm going for the "Reynolds number" section
. I hope I'll cover a good part of these fundamental and arguably boring definitions in a manner that is useful, meaningful and as simple as possible. After all, thorough definitions of these physical notions can be found in physicsworld and the wikipedia.
In the physics section of the slinging wiki, the part that I feel is more important and open is the problem of the bullet's spin.
After watching the splendid nightweave's images of the sling release, I think that the casting style, the hand position during the final stage of the cast, and the grip are key factors to determine the bullet spin. In the case of an spherical bullet the spin is somehow secondary, since it only causes a Magnus effect. But when firing glandes, the right spin is the difference between a stable and an overturning bullet.
Being able to predict and control the bullet spin is fundamental. I think I understand the basic cause of the bullet spin, and I devised a formula that should work, but I'm not sure of being right. At least, I think that the explanation (the bullet being dragged by the pouch during relese, because of a difference in tension between the chords of the sling) is consistent with the images that we have, but I think that more experimental data should be gathered.
Well, since the problem of bullet spin is (as far as I understand) highly hypothetical, I have not written about it in the wiki. So I better get back to work with the Reynolds number
.