Another SP functioning video...well
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 I tried to make a working trebuchet, and failed three times to get the "swing" right. So I opted for a hightech version a "Rotary Trebuchet". Using a sphere as an emitter and tweaking the UI settings for a continuous supply of ammo. Here it is. needs more tweaking though. 
 [flash=420,315:130lzer2]http://www.youtube.com/v/Vgvu8JaJ8e4[/flash:130lzer2]I would like to get the timing right, one ball per paddle, good throws at least 90% of the time. 
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 try dropping thr balls from higher so there dropping faster and make it further into the arms  
 might work to curve the arms slightly forward too?
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 I tried to do a rework but I broke it, with side flanges, and the higher drop, it might work if I can fix it. Of course I reworked the working model, anhd I don't have a copy. 
 Rule Number One in SketchyPhysics, save your work often. Rule Number Two, if you want to redo something make a copy and rework the copy, save your working original, if for nothing else for use as a reference.
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 and upload it with your post so others can play  
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 I will do that, now it is spinning with the modified flanges, but the balls won't grop into the wheel. 
 
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 New modified version without flanges. The flanges would be cool, with a V-mod on the center of the wheel, so the balls don't land in a straight line, more random placement, in theory anyway. 
 
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