Interesting!

Wouldn't the arrow need to be pointing towards the direction of the rotation? ???  That's what most of the other designs have.

Your technical drawing skills are impressive and approach USPTO guidelines in their present form!   I believe your design stems from a common misconception regarding angular momentum.....the allusion has been made above to the fact that the arrow or dart will leave the 'sling' tangential to the arc of travel and at a right angle to the sling cord.  It is a common misconception that an object released from arcuate travel will fly outwards parallel to the sling cord.  A powerful misconception indeed, for even upon realization and investigation of what is actually occurring......so many in modern science still miss much regarding this amazingly simple principle.   

Keep up the imaginative design work.....who knows what you might come up with next!

Here is another design that may have the same problem?  A sling makes me think one way and a shot thrower makes me think another ???

I hope someone could give these a try ???

I did a simple experiment last night that I think shows my designs should work.

I made a crude practice arrow from an unsharpened pencil and a filing card.  The end of the pencil with the eraser is the head of the arrow because it has some weight to it (remember arrows and spears center of gravity should be a little forward of its exact half way point).  The card was trimmed and two slots were cut in it and the pencil put through.  A very tiny piece of tape was put on.

I grasped the arrow in a pinch on its end just like my designs will and I made sure the fins were oriented correctly to function.

I performed overhand, underhand, and sidearm throws with many stable good flights.

There are many things going on in this process, it reminds me of the gyroscopic precession.

Far be it from me to prevent you from fully realizing the due course of your trial and error process......such process, it seems, has kept the 'slippery pivot' of our world firmly in it's place for eons.


Good luck in your pursuits!   

The outward pointing arrow or dart is the natural orientation. More air resistance is the only penalty and will more than be made up for because the dart doesn’t have to realign itself.

Obviously the dart has be short and made of dense material.

I believe Hondero’s cestro works this way. In a modern version the support loop can be replaced by a fishing rod eyelet of the type that has two mounting points. This support is for holding the tail in position on retention cord. Although a more efficient way to sling a dart, proper fins/fletching is a must.    

http://slinging.org/forum/YaBB.pl?num=1074713443/162#162

I throw a knives butt first and with a single half rotation (up to about 25 feet).  That led to throwing darts fletching first and seeing them also rotate one half rev and stabilize in flight toward the target.

That being said I think TechStuf is correct in that the direction of flight coming off a sling is NOT in a direction out and away from the direction of the cords but at a 90 degree angle to them... if you study the retention and release mechanism of the cestrosphendon it is designed to release the "arrow" at an orientation perpendicular to the cords.   I have no doubt most any finned projectile will "straighten up and fly right" (pun intended).  However the law of conservation of energy and momentum dictates if you release the "arrow" pointing at a right angle to its flight path, it will have to "burn energy" getting properly oriented... and if two designs were to pit equally powerful slingers with equal techniques (i.e. all other things being equal) then the design releasing the arrow in the proper orientation to its flight will fly farther and faster than the one being released at a right angle to the flight path...  either that or the law of conservation of energy and momentum isn't a law at all...