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Sniper Rifle 360 (UPDATED 11/1/08)

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Unread postAuthor: al-xg » Tue Feb 12, 2008 1:49 pm

Wouldn't pellets tumble ina smooth bore ? would they actually help with accuracy ?
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Re: Sniper Rifle 360

Unread postAuthor: OuchProgramme » Tue Feb 12, 2008 10:01 pm

Velocity wrote:Yes, I am calling it a sniper rifle, no it does not have a rifled barrel, yes you will need to deal with that.



Woohoo. Somebody finally understands the meaning of "rifle".

Many cannon's do NOT have rifled barrels, and yet they call them rifles.

+1 to ya :)
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Unread postAuthor: jackssmirkingrevenge » Wed Feb 13, 2008 12:12 am

al-xg wrote:Wouldn't pellets tumble ina smooth bore ? would they actually help with accuracy ?


Pellets that are "diablo" shaped (like a shuttlecock) were originally designed to work well in smoothbore barrels, hence the forward cetre of gravity and hollow tail, so if they're medium weight (heavyweights tend to have poor weight distribution for unrifled flight) they're pretty accurate without spinning.

Woohoo. Somebody finally understands the meaning of "rifle".

Many cannon's do NOT have rifled barrels, and yet they call them rifles.


It's not just spudders, have a look here

Image

Steyr call it the AMR - Anti Matériel Rifle - in spite of the fact that it's always been a smoothbore weapon. Now you're not going to argue with Steyr-Mannlicher are you?

:D
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Unread postAuthor: OuchProgramme » Wed Feb 13, 2008 12:49 am

Woah JSR. Impressive.


I'll take a stand on both sides
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Unread postAuthor: Velocity » Thu Feb 14, 2008 12:20 am

I like the suggestion of darts for the barrel... I can see that working alright. In the meantime, while I search for darts, pellets should certainly provide a good alternative.

I'll look into that JSR.
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Unread postAuthor: mark.f » Fri Feb 15, 2008 7:19 am

If you can't find any darts, homemade paper darts are surprisingly accurate. Most people make them with nails rolled into the tips, and reinforced with more glue to withstand pneumatic pressures. I make them for my blowgun all the time, and they're a lot easier to make for lung-powered launchers.
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Unread postAuthor: jackssmirkingrevenge » Fri Feb 15, 2008 7:39 am

OuchProgramme wrote:Woah JSR. Impressive.


No kidding :)

It fires 20 gram (308 grains) tungsten dart (flechette) with muzzle velocity of 1450 meters per second (4750 fps). At 1000 meters this projectile will penetrate a 40 mm of RHA (rolled homogenous steel armour) and will result in serious secondary fragmentation effect behind the armour. That said, it will penetrate two walls of any modern APC at one kilometer range. The trajectory is very flat and does not rise higher than 800 mm above the line of sight when fired to 1000 meters.
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Unread postAuthor: al-xg » Fri Feb 15, 2008 2:31 pm

I think it was the AMR that made shoot a 20g steel dart from my first piston cannon.
Darts work great (lighter ones though), I've shot quite a few carbon ones, and they are extremly accurate, but tend to get stuck into hard targets... I've had to break a few to get them out.
The other problem is multishot or auto loading, darts require long shells so more dead space and a higher chance of jaming...
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Unread postAuthor: A-98 » Tue Feb 19, 2008 9:05 am

Why is it called the sniper rifle 360? Cause when you see it you'll turn 360 degrees and walk away!

lol. terrible joke, but i coulsnt resist.

Anyway. beautiful looking gun there. I might just make something like it, cause if just found a good place for copper near me.
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Unread postAuthor: Ragnarok » Tue Feb 19, 2008 9:12 am

A-98 wrote:Cause when you see it you'll turn 360 degrees and walk straight at it again!

In case you hadn't noticed, 360 is full circle, so you'd still be walking in the same direction.

Perhaps 360 means it's "revolutionary"... *Gets beaten up for bad pun*
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Unread postAuthor: Velocity » Tue Feb 19, 2008 8:44 pm

360 is related to its maneuverability; its light weight and small size make it easy to navigate in any direction or angle, hence the 360 degrees. Maybe that doesn't make complete sense, but 360 is a sweet number, so I kept it.
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Unread postAuthor: Strake » Wed Feb 20, 2008 6:20 am

@ markfh11q cellular core what are the odds LOL
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Unread postAuthor: Velocity » Wed Feb 20, 2008 11:26 pm

Does anyone have a good method for making reliable darts for this type of barrel? Its 0.24" in diameter, if you didn't read the description. A few days ago, I tried shooting a BB through a filled water bottle from 10 feet away at 120 PSI, and it was not able to penetrate through the other side of the bottle. Is this to be expected with a projectile that is a plastic airsoft BB?
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Unread postAuthor: elitesniper » Wed Feb 20, 2008 11:31 pm

thats normal because water slows down the bb tremendously, i could barley pierce a filled bottle with my crossman pump pellet rifle.
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Unread postAuthor: jackssmirkingrevenge » Thu Feb 21, 2008 12:06 am

Velocity wrote:Is this to be expected with a projectile that is a plastic airsoft BB?


Yes, plastic BBs have increadibly poor sectional density and as such will slow down too rapidly for effective penetration. Try lead pellets ;)

elitesniper wrote:i could barley pierce a filled bottle


What, with this :shock: :D

As an illustration of the importance of projectile weight as well as velocity for penetration:

[youtube]http://youtube.com/watch?v=lMWNpiaPha8[/youtube]

0.25 gram BB, penetrated both sides of the can


[youtube]http://youtube.com/watch?v=t0OnQZvvR7g[/youtube]

0.12 gram BB, penetrated one side only
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