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machined APFSDS projectiles

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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Unread postAuthor: dewey-1 » Sun Aug 11, 2013 8:47 am

dart guy wrote:Sorry i kinda ment that you should shape a block of lead like the fins and body like the aluminum then you should take the hardest metal you have and make that the actual dart.


You can not use lead for the fins and body due to the weight. Please research CG and CP for a better understanding of why!
Here is a simplified explanation for you:
http://www.rockets4schools.org/images/B ... bility.pdf
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Unread postAuthor: dart guy » Sun Aug 11, 2013 8:51 am

I cant read the pfd.
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Unread postAuthor: dewey-1 » Sun Aug 11, 2013 9:14 am

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Unread postAuthor: dart guy » Sun Aug 11, 2013 11:56 am

sorry but my mind doesnt work to well after being stung and biten by at least 7 angry hornets
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Unread postAuthor: Gippeto » Sun Aug 11, 2013 2:24 pm

Then don't get stung. :P
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Unread postAuthor: Blitz » Sun Aug 11, 2013 2:46 pm

Gippeto wrote:Then don't get stung. :P


Haha! :D. Good advice.
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Unread postAuthor: dart guy » Sun Aug 11, 2013 3:16 pm

hornets and not wearing glasses...yeah just dont assume that if you are using throwing knives, huge sticks, and rocks to throw at the side of a small shed and dont see an angry hornet mob around the target that it is safe to climb up the side
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Unread postAuthor: jackssmirkingrevenge » Sun Aug 11, 2013 11:57 pm

Sadly the darts did not live up to expectations.

taofledermaus wrote:Darts: shot- results
We shot the darts today. None of them worked. It seemed the fins were stripped off or broke off at the moment they left the barrel, so the rods just tumbled through the air. The 3 bolts that you made worked very well, and were pretty accurate. They flew perfectly straight, so it isn't all bad news.


I'm guessing that since they are only supported at the base, on acceleration the metal body skews to one side and these torsion forces are enough to break the fins. Back to the drawing board :)
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Unread postAuthor: jackssmirkingrevenge » Mon Aug 12, 2013 4:21 am

Here we go, plan B - something very similar in design to a "proper" APFSDS round :D
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Unread postAuthor: Gun Freak » Mon Aug 12, 2013 9:01 am

Wow! That looks great!!
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Unread postAuthor: dewey-1 » Mon Aug 12, 2013 10:44 am

jackssmirkingrevenge wrote:Sadly the darts did not live up to expectations.

taofledermaus wrote:Darts: shot- results
We shot the darts today. None of them worked. It seemed the fins were stripped off or broke off at the moment they left the barrel, so the rods just tumbled through the air. The 3 bolts that you made worked very well, and were pretty accurate. They flew perfectly straight, so it isn't all bad news.


I'm guessing that since they are only supported at the base, on acceleration the metal body skews to one side and these torsion forces are enough to break the fins. Back to the drawing board :)


Was the barrel used making use of a choke or a slug barrel? Just a thought.
How are the fins attached? I am thinking the fin assembly seperated rather than breaking the fins.
Which ones were the bolts he referred to?
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Unread postAuthor: dart guy » Mon Aug 12, 2013 12:38 pm

Jsr, i like the new desine,but i think that the dart itself will not fly right if you dont have deterline fourths so that the wings dont get caught.
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Unread postAuthor: jackssmirkingrevenge » Mon Aug 12, 2013 5:09 pm

dewey-1 wrote:[Was the barrel used making use of a choke or a slug barrel? Just a thought.


Smoothbore unchoked, that would have been a basic mistake :)

How are the fins attached? I am thinking the fin assembly seperated rather than breaking the fins.


Nope, shattered. He said in the slow mo the fins and shredded wad came out before the bolt.

Which ones were the bolts he referred to?


This is what he had to test, apparently only 3, 4 and 5 were successful, the rest shattered in the barrel.

Jsr, i like the new desine,but i think that the dart itself will not fly right if you dont have deterline fourths so that the wings dont get caught.


The balle sauvestre uses two sabot "petals" and seems to work well enough.

I'm confident these will work so I made four more:
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Unread postAuthor: jackssmirkingrevenge » Wed Aug 14, 2013 7:31 am

Latest package for taofledermaus, aside from the saboted rounds I also made some PVC supports to stop the previously made projectiles with fullbore fins from twisting in the barrel in the hope that they will survive firing, as in the diagram.
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Unread postAuthor: MrCrowley » Wed Aug 14, 2013 8:11 am

Finally figured out what they remind me of!
Image

Don't think those toy bombs would fly as well though :(
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