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Great idea if all things are equa, l but all it takes is one dart to be sharper or less sharp than the others and your readings will be outta wack. Your buddy could have a shorter dart flying at twice the speed with dull tips and your longer darts with sharp tips at half the speed might penetrate farther than the lighter darts of your buddy. Not a good measure of speed but certainly could be used as an indicator of penetration.
 

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If you shoot the same dart, or use a given degree angle for the tips... and sharpen them all in the same way...

Actually past a certian point, sharpness doesn't matter.
On the contrary, it matters a great deal. I can take two identical darts one with a long sharp point and the other with a shallower point. With a good point I can blow that dart through1/2 inch plywood yet the dart with the shallower point will barely get through1/4 -38 plywood.

The post was suggesting a cheap way to determine blow gun speed. Penetration is not always related to speed. Therefore it is not a reliable method of determining anything other than how many pages you punched through that shot.

There is one software program that is free for download around here somewhere that uses sound to determine speed. It apparently gives satisfactory results and is free.
 

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I appreciate your appearing to tread lightly with your introduction but I can assure you that there is no need to. The beauty of a forum is to exchange ideas. Sometimes we agree and other times we don't. I hope I havn't given you the impression that I'm unwilling to listen to your view. If I have I apologize. But here is the deal, when any of us hears something that is different than that of what our own experiences have been and actually contradicts those experiences we owe it to each other to suggest why. A forum can be a wonderful learning platform that way.

So here is where I am not making the leap of thought with you because you are talking knife blade cutting edges and spears. Both of these edges are designed to cut. I was talking purely about target darts - round wire target darts sharpened to a round point designed to penetrate (totally different) and the greater the angle of that point the greater the penetration providing the point is not damaged during the penetration. I have taken darts side by side, ground to the same angle and merely polished the bevel of the points of half of them and seen time and time again that the polished ones penetrated farther into the plywood than did the darts with the unpolished point bevels.

I'm thinking you were perhaps talking about hunting broadhead type darts when I was talking target type? If so, here in lies our dilemma.
 
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