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YouTubeでの評価:
How fast can a slingshot propell a tennis ball? Using the "Hand Howitzer" and butterfly style triple bands, Jörg Sprave clocks 207 km/h (129 mph). That is just 1 mph slower than Venus Williams, currently number three in the "womens fastest serve" record list!It is interesting how the low forked Howitzer shoots the unusually big ammo without any problems. A "The Slingshot Channel" production! |