Login    Register
User Information
Username:
Password:
We are a free and open
community, all are welcome.
Click here to Register
Sponsored
Who is online

In total there are 72 users online :: 6 registered, 0 hidden and 66 guests


Most users ever online was 155 on Mon Aug 15, 2016 1:40 am

Registered users: Bing [Bot], Google [Bot], Google Adsense [Bot], mrfoo, MSNbot Media, Yahoo [Bot] based on users active over the past 5 minutes

The Team
Administrators
Global Moderators
global_moderators.png CS

Pressure at the muzzle when projectile leaves?

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
Sponsored 
  • Author
    Message

Unread postAuthor: Ragnarok » Fri Nov 13, 2009 11:18 pm

Solar wrote:So this is considered a stripper instead of a brake due to its purpose?

Essentially. It's an air stripper when its primary purpose is to strip the muzzle blast in the interests of accuracy, a muzzle brake when its primary purpose is to reduce recoil.

Is the bore size consistent with the barrel bore?

Not quite sure what you mean there.
If you're asking if the "bore" of the air stripper is around the calibre, pretty much. It's a little bigger, but as close as is feasible.

psycix wrote:Doesn't a big porting suffice or are the gases too slow to vent out?

Porting alone might suffice (it's shown good results for me in the past), but while I could settle for "just suffice", I'd sooner have overkill than underkill - each projectile I'm sending downrange is going to be pretty costly in both time and money, so I'd rather not waste that with being needlessly measly.

After all, why just use porting when for little extra effort I can combine that with an air stripper, and get the benefits of both?

Brian the brain wrote:We'll see what it does when Rag presents the cannon..and ammo... I hope it's soon.

I won't lie, it's not going to be soon. This a long term project that demands a whole load of resources - space, time, effort and money.

While most of the "paper" side of design is done or close to complete leaving the practical stages (first preliminary testing, then after that's taken into account, the actual "range day"), it would be stupid to move on to those (and their expense) without things like the venue already sorted.

As I'm sure you can appreciate, places where one can safely and discretely send high velocity AP darts flying a quarter mile are not entirely easy to come by. When I've got a confirmed site, then I'll start looking at spending the time/money on what will probably largely boil down to a one-off "long range day".
(I suppose if the UKSGC meet ever gets together, that'd be a possible time for all of that to happen.)

Still, without my laptop, the design is on hold anyway - not to mention, I've got other things on my timetable for a while anyway.
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

Unread postAuthor: Pookydarts » Sat Nov 14, 2009 6:24 am

not to mention, I've got other things on my timetable for a while anyway.

Ah! Women! What a wonderfully complicated, expensive and frustrating way to not get spudguns built! :lol: :lol:
  • 0

User avatar
Pookydarts
Corporal
Corporal
 
Posts: 61
Joined: Tue Jul 01, 2008 6:29 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sat Nov 14, 2009 6:47 am

Pookydarts wrote:Ah! Women! What a wonderfully complicated, expensive and frustrating way to not get spudguns built! :lol: :lol:


I think you'll find he's referring to touring with his new age christian rock band :)
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: Pookydarts » Sat Nov 14, 2009 8:19 am

ROFLOLAITALBOWCO
(RollongOnFloorLaughingOutLoudAndIThinkALittleBitOfWeeCameOut...)

OMG Unless you were being serious... I'm so embarrassed... :oops:
  • 0

User avatar
Pookydarts
Corporal
Corporal
 
Posts: 61
Joined: Tue Jul 01, 2008 6:29 am
Reputation: 0

Unread postAuthor: jackssmirkingrevenge » Sat Nov 14, 2009 9:16 am

Any excuse to repost this :D

Image
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: POLAND_SPUD » Sat Nov 14, 2009 9:23 am

hey they've got girls there!! of course they could be prettier but I found that paper bags help a lot :D
  • 0

Children are the future

unless we stop them now
User avatar
POLAND_SPUD
Chief of Staff
Chief of Staff
 
Posts: 5405
Joined: Sat Oct 13, 2007 4:43 pm
Country: Israel (il)
Reputation: 10

Unread postAuthor: Pookydarts » Sat Nov 14, 2009 9:24 am

Yep,
That's the one I was laughing about!
Edit...(Who's the one on the left...) :lol:
  • 0

User avatar
Pookydarts
Corporal
Corporal
 
Posts: 61
Joined: Tue Jul 01, 2008 6:29 am
Reputation: 0

Sponsored

Sponsor
 


Unread postAuthor: jackssmirkingrevenge » Sat Nov 14, 2009 9:48 am

POLAND_SPUD wrote:hey they've got girls there!! of course they could be prettier but I found that paper bags help a lot :D


They're Christians, don't bother ;)
  • 0

User avatar
jackssmirkingrevenge
Donating Member
Donating Member
 
Posts: 24225
Joined: Thu Mar 15, 2007 11:28 pm
Country: Holy See (Vatican City State) (va)
Reputation: 66

Unread postAuthor: Pookydarts » Sat Nov 14, 2009 9:55 am

They go the hardest! :wink: :lol: :lol: :lol:
(Edit) Back on topic: Why would one want to penetrate a relatively small 1/2 inch steel plate at 300 yards? :?
(Edit #2) The 2nd from right looks like he already penetrated the 1/2" steel plate! :D
  • 0

User avatar
Pookydarts
Corporal
Corporal
 
Posts: 61
Joined: Tue Jul 01, 2008 6:29 am
Reputation: 0

Unread postAuthor: Ragnarok » Sat Nov 14, 2009 10:47 am

POLAND_SPUD wrote:hey they've got girls there!! of course they could be prettier but I found that paper bags help a lot

I'll spare you the carnage that would befall you if I passed that information on.

Pookydarts wrote:Who's the one on the left...

Even if I did tell you, you wouldn't know who it was.

~~~~~

And no, what I'm spending my time on is nothing as socially "normal" as relationships. It's far more nerdy.

There's a wargaming tournament in about four weeks which I'm hoping to make an appearance at, and it's going to take quite a lot of effort on my part to both make said appearance and a decent performance.

~~~~~

Pookydarts wrote:Back on topic: Why would one want to penetrate a relatively small 1/2 inch steel plate at 300 yards?

It's hardly on topic, the discussion of my long range project is itself not part of the original discussion.

Anyway, it's 400 metres (~440 yards). And, well - why not? Accuracy at ranges of hundreds of metres is as of yet, an area which spudgunning has left (largely) unexplored.
Much of spudgunning is focused on improving internal ballistics*, with most attempts to improve external and terminal ballistics being little more than afterthought. To break out of that, I set myself an objective where all the three areas were important.

*If, of course, the builder decides to follow a more inventive route than just making the cannon big to produce the required power.
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

Unread postAuthor: Solar » Sun Nov 15, 2009 3:19 am

Yes, I have found that accuracy is about the whole package of ballistic zones combined into what becomes the final outcome.

Yes, I was referring to the air stripper bore size. I have a feeling that I am going to be doing a lot of barrel port style for awhile. We will have some nice rounds soon for high tolerance testing.
  • 0

User avatar
Solar
Colonel
Colonel
 
Posts: 512
Joined: Tue May 17, 2005 11:53 pm
Country: United States (us)
Reputation: 11

Unread postAuthor: Ragnarok » Sun Nov 15, 2009 12:04 pm

Solar wrote:Yes, I have found that accuracy is about the whole package of ballistic zones combined into what becomes the final outcome.

Pretty much, although terminal ballistics is only really part of accuracy when it means you make compromises on the external ballistics (like with hollow-point bullets).

I have a feeling that I am going to be doing a lot of barrel port style for awhile.

Well, if you want to, feel free to talk to me about external ballistics. I'm not exactly a master, but it's a subject I've studied avidly for the last few years.
  • 0

Does that thing kinda look like a big cat to you?
User avatar
Ragnarok
Chief of Staff
Chief of Staff
 
Posts: 5339
Joined: Tue Dec 19, 2006 8:23 am
Location: The UK
Reputation: 8

Previous

Return to Pneumatic Cannon Discussion

Who is online

Registered users: Bing [Bot], Google [Bot], Google Adsense [Bot], mrfoo, MSNbot Media, Yahoo [Bot]

Reputation System ©'