Canadian Airgun Forum

The #1 Community for Airguns in Canada!
It is currently Thu Apr 25, 2024 3:00 pm

View unanswered posts | View active topics


Board index » Main Forum » Mods and Repair

All times are UTC - 5 hours


The Canadian Airgun Forums are a place for people to discuss and learn about airguns and the airgunning sport in Canada. There are lots of discussions about airguns, airgun accessories, reviews, modification and repair information, airgun events, field target and free classifieds!

 

You need to register before you can post: click the register link to proceed. Before you register, please read the forum rules. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload your own pictures, and access many other special features. Registration is fast, simple, and absolutely free! To start viewing messages, select the forum that you want to visit from the selection below.



Post new topic Reply to topic  Page 1 of 2
  [ 22 posts ]  Go to page 1, 2  Next
  Print view Previous topic | Next topic 
Author Message
bigborebrit
 Post subject: big bore pcp power
PostPosted: Mon May 20, 2013 2:08 pm 
Offline

Joined: Sun Nov 18, 2012 3:21 pm
Posts: 61
Location: uk
Hi all I am in the middle of a big bore build and have a limit on air pressure due to my home made pump 500psi, I have done lots of tests and am very surprised by the fps. I have obtained 618 fps so I ask why is there such a need for high pressure, by the way the gun is .468 with a barrel of 34 inches


Attachments:
air gun 054.jpg
air gun 054.jpg [ 27.77 KiB | Viewed 1436 times ]
Top
 Profile  
 
gt403cyl
 Post subject: Re: big bore pcp power
PostPosted: Mon May 20, 2013 2:16 pm 
Offline
User avatar

Joined: Sun Aug 19, 2007 3:12 am
Posts: 769
Location: Oshawa, Ontario
bigborebrit wrote:
Hi all I am in the middle of a big bore build and have a limit on air pressure due to my home made pump 500psi, I have done lots of tests and am very surprised by the fps. I have obtained 618 fps so I ask why is there such a need for high pressure, by the way the gun is .468 with a barrel of 34 inches


I would consider this post a TEASE!!!! more info please!!!!

while a 34" barrel is quite long, as your on HPA I think you my be able to shorten it up a bit (with the limited knowledge of your project in mind)

and im not quite sure what the pic is, but more pics is always great

as far as higher pressures, for me at least, I don't want to fill after each shot, so for example, I may get 20 full power shots from 2500psi down to 1000psi, whereas I suspect your build needs to be filled after each shot to achieve full power shots

more air pressure in a vessel usually means more air on hand ie. compressed air

GT

_________________
QB.30 PCP w/ Leapers Bug Buster 4x32AO Mil-Dot
QB78D .22 w/ Leapers 3-9x40AO Mil-Dot
QB78 .22 Custom HFT Stock w/ Leapers 3-9x40AO Mil-Dot
Crosman 1100
Crosman 2240
Custom 2050
Brass M2250
Tanfoglio 1911
Top
 Profile  
 
bigborebrit
 Post subject: Re: big bore pcp power
PostPosted: Mon May 20, 2013 2:28 pm 
Offline

Joined: Sun Nov 18, 2012 3:21 pm
Posts: 61
Location: uk
the pic is of the valve head. the gun has a 1"1/2 by 24" res and as I said I have a limit on pressure due to my pump
Top
 Profile  
 
bigborebrit
 Post subject: Re: big bore pcp power
PostPosted: Mon May 20, 2013 2:38 pm 
Offline

Joined: Sun Nov 18, 2012 3:21 pm
Posts: 61
Location: uk
pic of valve


Attachments:
air gun 052.jpg
air gun 052.jpg [ 33.52 KiB | Viewed 1424 times ]
Top
 Profile  
 
gt403cyl
 Post subject: Re: big bore pcp power
PostPosted: Mon May 20, 2013 2:50 pm 
Offline
User avatar

Joined: Sun Aug 19, 2007 3:12 am
Posts: 769
Location: Oshawa, Ontario
bigborebrit wrote:
the pic is of the valve head. the gun has a 1"1/2 by 24" res and as I said I have a limit on pressure due to my pump


I see the picture of the valve now, please don't take what I said about "suspecting your build" as a negative, just trying to explain why we like the higher pressures,

I will say this, there are a lot more qualified people to talk to about pressures, builds and big bore guns I say I know just enough to get me in........ the door, lol

how many shots do you get on 500psi and what's your velocity like for them?

1-1/2" I assume that's outside diameter what's the wall thickness?

.468 WOW that's some lead, ball or bullet?
If your using round lead ball that would make them around 154-155gr @ 618fps that's 130fpe at the muzzle...... off of 500psi.....

GT

_________________
QB.30 PCP w/ Leapers Bug Buster 4x32AO Mil-Dot
QB78D .22 w/ Leapers 3-9x40AO Mil-Dot
QB78 .22 Custom HFT Stock w/ Leapers 3-9x40AO Mil-Dot
Crosman 1100
Crosman 2240
Custom 2050
Brass M2250
Tanfoglio 1911
Top
 Profile  
 
rrdstarr
 Post subject: Re: big bore pcp power
PostPosted: Mon May 20, 2013 3:09 pm 
Offline
User avatar

Joined: Sun Jul 15, 2012 10:49 am
Posts: 6030
Location: Victoria, BC and Clarkston, WA
I wanna see the whole damn gun! LOL!

_________________
-Rick

Brocock Concept .22
3 Crosman MK 1 pistol .22
Top
 Profile  
 
bigborebrit
 Post subject: Re: big bore pcp power
PostPosted: Mon May 20, 2013 3:20 pm 
Offline

Joined: Sun Nov 18, 2012 3:21 pm
Posts: 61
Location: uk
yes the outside dia is 1/12 inch wall 80 so it takes a lot of pumping ,I get three shots fps drop off is steep though
Top
 Profile  
 
bigborebrit
 Post subject: Re: big bore pcp power
PostPosted: Mon May 20, 2013 3:50 pm 
Offline

Joined: Sun Nov 18, 2012 3:21 pm
Posts: 61
Location: uk
gun pic


Attachments:
air gun 008.jpg
air gun 008.jpg [ 66.86 KiB | Viewed 1401 times ]
Top
 Profile  
 
bigborebrit
 Post subject: Re: big bore pcp power
PostPosted: Tue May 21, 2013 11:24 am 
Offline

Joined: Sun Nov 18, 2012 3:21 pm
Posts: 61
Location: uk
more pics


Attachments:
air gun 057.jpg
air gun 057.jpg [ 41.34 KiB | Viewed 1349 times ]
Top
 Profile  
 
bigborebrit
 Post subject: Re: big bore pcp power
PostPosted: Tue May 21, 2013 11:25 am 
Offline

Joined: Sun Nov 18, 2012 3:21 pm
Posts: 61
Location: uk
valve travel


Attachments:
air gun 053.jpg
air gun 053.jpg [ 28.97 KiB | Viewed 1349 times ]
Top
 Profile  
 
Voltar1
 Post subject: Re: big bore pcp power
PostPosted: Tue May 21, 2013 1:01 pm 
Offline

Joined: Mon Sep 05, 2005 10:55 pm
Posts: 6936
Location: Rocky Mtn Hse Alberta
bigborebrit wrote:
yes the outside dia is 1/12 inch wall 80 so it takes a lot of pumping ,I get three shots fps drop off is steep though



there in lies the answer.....

_________________
Image
Walter
Top
 Profile  
 
bigborebrit
 Post subject: Re: big bore pcp power
PostPosted: Tue May 21, 2013 3:37 pm 
Offline

Joined: Sun Nov 18, 2012 3:21 pm
Posts: 61
Location: uk
gun pics


Attachments:
pcp 2 007.jpg
pcp 2 007.jpg [ 64.42 KiB | Viewed 1319 times ]
Top
 Profile  
 
bigborebrit
 Post subject: Re: big bore pcp power
PostPosted: Tue May 21, 2013 3:41 pm 
Offline

Joined: Sun Nov 18, 2012 3:21 pm
Posts: 61
Location: uk
more pics


Attachments:
pcp 2 006.jpg
pcp 2 006.jpg [ 56.33 KiB | Viewed 1317 times ]
Top
 Profile  
 
bigborebrit
 Post subject: Re: big bore pcp power
PostPosted: Tue May 21, 2013 3:47 pm 
Offline

Joined: Sun Nov 18, 2012 3:21 pm
Posts: 61
Location: uk
hope the pics are ok I know the build is a bit crude but I built this in my lunch times at work please let me know what you all think
Top
 Profile  
 
Daryl
 Post subject: Re: big bore pcp power
PostPosted: Tue May 21, 2013 5:18 pm 
Offline

Joined: Wed Jan 05, 2011 12:35 pm
Posts: 11367
Location: P.G. B.C.
I think it's pretty cool!

Lets see - .46 calibre at 600fps plus, with round ball or slug & what weight? Is your reservoir restricted to 500psi- or is it & your seals capable of handling at least 1,000psi? More? What is the potential of this gun? Intersting and quite a job during lunch hours. Is someone else keeping watching the time for you?

_________________
Best Wishes
Daryl
Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  Page 1 of 2
  [ 22 posts ]  Go to page 1, 2  Next

Board index » Main Forum » Mods and Repair

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 7 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
News News Site map Site map SitemapIndex SitemapIndex RSS Feed RSS Feed Channel list Channel list

Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group

phpBB SEO