Thearos, every projectile flies with an arc, even a bullet shot at close range has a slight arc to it. Flat-lining at distance can't just be "lobbing with a low arc" because then lobbing at distance would be "flat-lining with a high arc", and the terms would be interchangeable
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Bill's upper body/arm is much more divisive. If you view the videos in different windows, there is clearly a difference. To truly make distance, some muscle is required, so you must use the flat-lining form. However, gravity also comes into play so you must aim higher which, dare I say it, is an element of lobbing (however you can go back to my previous posts and see that I really think of it more as "whanging on an angle" because of the intent behind the throw). So distance really has to employ elements of both (kind of), however we can argue about which is better sub 50 yards until the cows come home.
Bill Skinner, I definitely agree with most of what you said, but I really did think Jaegoor was lobbing there. I think Thearos may have even posted that video earlier as reference to what lobbing is. No, I don't spar full power, and neither do the people I spar, because of the high chances of injury. However, when slinging at a target, the target should be able to take the hits, and it certainly isn't going to hurt you back.
I may have joked around about lobbing being weak, but even an 8oz rock that's hand thrown will have some power behind it, and according to Masi's equation it has even more momentum than flat-lining. However, the breaking of rocks also isn't a good judge of power. I'm sure you and any guy who grew up in the country spent many boyhood hours breaking small rocks against bigger rocks by hand (via hand throwing).
What do you consider lobbing then?