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Compound Rounds from Sureshot

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: jagerbond » Thu Jun 18, 2009 2:52 am

jackssmirkingrevenge wrote:I still think an ordinary bolt would have sufficed as an insert and been a bit more durable, but in any case as per e-mail this is a fantastic result and it's good to see it was worth all the effort you put into it :)


Yes, lead was what gave me the 1/2 caliber CG/CP differential... I agree though, carriage bolts would look nice and work well too. I am planning on some steel penetrator rounds for damage videos.
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Unread postAuthor: Gaderelguitarist » Thu Jun 18, 2009 10:40 am

I am planning on some steel penetrator rounds for damage videos.


Yes!

What would be very interesting would be to make a round of UHMW with a mounting hole that can except either the lead nose or a steel nose.

Then you could sell not only the plastic portion, but also an assortment of metal tips.
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Unread postAuthor: jagerbond » Fri Jun 19, 2009 2:12 pm

Gaderelguitarist wrote:
I am planning on some steel penetrator rounds for damage videos.


Yes!

What would be very interesting would be to make a round of UHMW with a mounting hole that can except either the lead nose or a steel nose.

Then you could sell not only the plastic portion, but also an assortment of metal tips.


These have a 3/8" hole from nose to tail so you can add your choice of toppings.
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Unread postAuthor: MountainousDew » Fri Jun 19, 2009 2:17 pm

I noticed when I was looking over the pictures that the lead parts don't screw in, have any of them fallen out?
Or are they a tight enough fit?
That's what she said!

Edit: Have you tested these rounds in a pneumatic?
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Unread postAuthor: jagerbond » Fri Jun 19, 2009 2:29 pm

MountainousDew wrote:I noticed when I was looking over the pictures that the lead parts don't screw in, have any of them fallen out?
Or are they a tight enough fit?
That's what she said!

Edit: Have you tested these rounds in a pneumatic?


The lead caps have a coaxial bulge on the stem. We use a rubber hammer and tap them in. They fall out on impact sometimes, if they're not all bent up you can tap them back in and re-shoot.
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Unread postAuthor: jagerbond » Fri Jun 19, 2009 2:31 pm

MountainousDew wrote:
Edit: Have you tested these rounds in a pneumatic?


We have not yet, but hope to soon.
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Unread postAuthor: jeepkahn » Fri Jun 19, 2009 2:44 pm

Any word on smaller bore projectiles??? 1" and .5" maybe???
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Unread postAuthor: MountainousDew » Fri Jun 19, 2009 2:46 pm

jeepkahn wrote:Any word on smaller bore projectiles??? 1" and .5" maybe???

Yeah, any word(s)?!

And have you fired the normak UHMW rounds in a pneumatic?
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Unread postAuthor: jagerbond » Fri Jun 19, 2009 2:52 pm

jeepkahn wrote:Any word on smaller bore projectiles??? 1" and .5" maybe???


1" material came in just the other day with 1.75, and 2.5" so they'll be along shortly... next week probably
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Unread postAuthor: jagerbond » Fri Jun 19, 2009 2:53 pm

MountainousDew wrote:
jeepkahn wrote:Any word on smaller bore projectiles??? 1" and .5" maybe???

Yeah, any word(s)?!

And have you fired the normal UHMW rounds in a pneumatic?


Not yet... Soon though
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Unread postAuthor: dewey-1 » Fri Jun 19, 2009 2:54 pm

jagerbond;

You have to show the "weeble-wobble hula dance" video.
This shoud give people an idea of its center of gravity.
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Unread postAuthor: jagerbond » Fri Jun 19, 2009 3:05 pm

dewey-1 wrote:jagerbond;

You have to show the "weeble-wobble hula dance" video.
This shoud give people an idea of its center of gravity.


OK OK


[youtube]http://www.youtube.com/watch?v=1e9769hTlTU[/youtube]
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Unread postAuthor: MountainousDew » Sat Jun 20, 2009 1:21 pm

Do you think you could make a round for a 2 1/2 SDR sch 21 barrel?

It will be a while before I finish the gun, since I still in the design phase, but it will have a Soda can barrel... I drink a lot of Mountain Dew so why not recycle the cans by shooting them, right? I get to have fun and save the planet, sorta.

I measured the can and it came out to be a little over 65mm and Wikipedia agreed. I don't know the exact diameter since I was just using 2x4s and a plastic ruler, so it might have a larger diameter than the 2.5 inch stock you have...
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Unread postAuthor: USGF » Sun Jun 21, 2009 5:40 am

MountainousDew wrote:Do you think you could make a round for a 2 1/2 SDR sch 21 barrel?

SNIP

I measured the can and it came out to be a little over 65mm and Wikipedia agreed. I don't know the exact diameter since I was just using 2x4s and a plastic ruler, so it might have a larger diameter than the 2.5 inch stock you have...


MD, I'm pretty sure the stock will be oversize. It may be close to 65mm. I checked a soda can here and it is 66mm. SDR 21 in 2-1/2 is supposed to be 2.655" nominal, approx 67.44mm. I'll go over the dimensions with Mike. I know the sched 40 2-1/2" rounds are on the agenda.

EDIT: Hold on, I found the material. It measures approx 65.6mm as it is not perfectly round :?

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Unread postAuthor: dewey-1 » Sun Jun 21, 2009 7:28 am

USGF wrote:
MountainousDew wrote:Do you think you could make a round for a 2 1/2 SDR sch 21 barrel?

SNIP

I measured the can and it came out to be a little over 65mm and Wikipedia agreed. I don't know the exact diameter since I was just using 2x4s and a plastic ruler, so it might have a larger diameter than the 2.5 inch stock you have...


MD, I'm pretty sure the stock will be oversize. It may be close to 65mm. I checked a soda can here and it is 66mm. SDR 21 in 2-1/2 is supposed to be 2.655" nominal, approx 67.44mm. I'll go over the dimensions with Mike. I know the sched 40 2-1/2" rounds are on the agenda.

EDIT: Hold on, I found the material. It measures approx 65.6mm as it is not perfectly round :?

USGF


I think your ID of 2.655 is the max ID for SDR26 not SDR21 at a 2-1/2 OD.
I get 2.581 nominal ID for SDR21. Min Max range of 2.554 to 2.608 worst case.

USGF Did you try the pipe ID speadsheet?
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