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This is a very destructive dart.

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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This is a very destructive dart.

Unread postAuthor: boyntonstu » Tue Jun 01, 2010 12:53 pm

[youtube]http://www.youtube.com/watch?v=5LeaXQ4z01A[/youtube]

This is a very destructive dart.

It flies straight and true.

The 10d nail head first penetrates 2 layers of 3/4" plywood and the 3/4" shotshell face makes a deep impression in the plywood.

I can reverse it to make it go point first, but I need to weld on a stop to prevent the plastic seal from sliding down the nail.

I finally figured out how to make a dart stable and fly straight.
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Last edited by boyntonstu on Tue Jun 01, 2010 1:53 pm, edited 1 time in total.
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Unread postAuthor: MRR » Tue Jun 01, 2010 1:45 pm

Do you mind to share your design with us?

At what frame rate did you record the shot? A recording at 1200fps would be appropriate at this speed, I think.
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Unread postAuthor: boyntonstu » Tue Jun 01, 2010 3:07 pm

MRR wrote:Do you mind to share your design with us?

At what frame rate did you record the shot? A recording at 1200fps would be appropriate at this speed, I think.


Image

144 grain dart.

Notice that the plastic barrel sealer cg is way forward and the T shirt tail stabilizes the dart.

Why backwards?

If I shoot it point first, the shotshell seal will fly forward off the nail at over 1,000 fps.

To make it work point first, I need to epoxy a stop to prevent the plastic from flying forward off the point of the nail.

After it hits the target, in the point forward orientation, it is proper for the plastic seal to slide down the nail to the head.

Image

Tail of dart with point sticking out.

The head of the 3” 10d nail went past the 2 layers of suitcase fabric and 2 layers of ¾” plywood.

It would be like being shot with a wadcutter.

Image
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Unread postAuthor: spudtyrrant » Tue Jun 01, 2010 3:57 pm

Don't you mean 9.33 grams? :P jk. The new dart looks good.
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I ♥ ♣'in baby seals
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Unread postAuthor: boyntonstu » Wed Jun 02, 2010 8:12 am

Tail shape in flight.

Captured from AVI using Virtualdub.

Notice how cylindrical the T shirt tail appears.

P.S. The head of my 10d nails measures .36 caliber.
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