Chris,
For making my mold I used common plaster, the paterns I fashioned from plasticine (quite nicely). I made only two shapes: the ellipsoid one and the drop second one. The mold was two-piece, so the last projectiles had got some feedhead (the frill ?) which I had to file smooth. The used materials didn't give the ideal surface but it was not so bad. It was my first experimental teeming. As result, I got 5 drops (90 g) and 5 baseballs (exactly 100 g).
Jesús,
Anyway, sure you are right, the smaller pouch is better due to aerodynamics. But about an influence of dimples (or rouhness)
in glandes flight I'm not convinced yet. I think the "lead dimpled golf ball" should have smaller air drag than smooth one, because
mass have no relation with air drag. However I agree that the range increase isn't so big for heavy "lead golf ball" because it carries much more kinetic energy relative to air drag, than a real lighter golf ball. So maybe the dimples would be en overstatment for lead glandes. But It follows me to think that a bit rough surface of glandes is not so bad and it isn't worth polishining or somethin like that. I hope my explanation is clear. Mayby I'm wrong.
David,
Thanks, I'm open for every support and I would be gratefull.
Today I tested my 10 glandes on my "measure spot" with the just made special sling for them. I was a litlle bit stressed because I had got only 10 tries. First I slung the "drop glandes" and as I expected they was getting the wild fly from the pouch, almost all ones flew with noise. But anyway the "drops" travelled pleasantly far relative to good stones even, they vanished. Next I tested the rugby-shaped glandes. They all flew
completely voicelessly. Folks! I slung too flat but what fly it was! Simply pure delight for my eyes. It is quite different than slinging stones. But I didn't know where they touched down.
I slung from 500 m (1640 ft) distance to the viaduct. Look please at the picture (that one was taken from 250 m to the viadust in October):
http://www.slinging.org/forum2/yabb/YaBB.cgi?board=1;action=display;num=10650944...I finished quickly and impatiently come back to my wife who hidden behind of the white ruin wall observed the aim zone.
Guys, she "raported" me that heard no flied projectiles, but...,
but... she heard... one clear... knock into the steel part of the viaduct! She is sure that was the my shot.
So it looks like I'm ready! Probably
Jurek