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kruzaroad

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Posted: 19 Nov 2022 at 8:34am

Dude that sux. Was it in the sun, were you around when it went off.
One more reason for me to stay away from gas, easily get to that temp in hawks bay sitting in car.
Chances it was faulty metal?

mercs

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Posted: 18 Nov 2022 at 6:55pm

Welcome from the west, good to hear some rabbits are for it.

Look forward to learning more about your projects.

Note to all - do not heat CO2 bottles or capsules, 31 degrees celsius sounds like a great performance enhancement but believe me over temperature is bloody dangerous, even left in direct sun they can become a real risk.

Be Safe Mates

grbaker5

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Posted: 04 Nov 2022 at 8:58am

Very cool.

Tempted to have a play with my Hammerli 850 .177 now... maybe a simple motorcycle heated hand-grip wrap from Aliexpress.

Edited by grbaker5 - 04 Nov 2022 at 8:59am

Mic

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Posted: 17 Sep 2022 at 9:48am

Welcome DaveS

Billbobnz

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Posted: 16 Sep 2022 at 5:49pm

This is brilliant, do you mind if we all come and help/watch you build this. Please keep us in the loop with updates.

Don't worry about the looks just make it look mean as. I want to make a bullpup version of the cr600w some day.

Cool suggestion on the heated sock.

DaveS

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Posted: 16 Sep 2022 at 4:03pm

Hi,

Good idea, I'm planning to make a custom transfer valve with an Oring at the front that will cover the sight port. A section of it will be turned down 5mm for heating coil windings with the wires exiting through the sight port. I'll have a thermo couple in there too setup for 31C and a LiPi battery pack in the butt. In front of that the plan is for a permanent plug that has a Sodastream thread and valve actuator. I'll use the 460cc bottle (about 20 12g powerlettes). I have a 4k carbon fiber tube as a barrel sheaf. I'll leave 50mm in front of the valve as a staging tank, I should get enough heat transfer from the alloy transfer valve to to keep this warm enough. The CR600 barrel is quite nice, got a bit of a choke and likes JSB 5.52s. The scope will be a Veyron 3-12x44. I would really prefer a compact fixed 4x32 with zero parallax at 40m. Light, simple, and cheap, I'm trying to get Vector Optics to build an airgun specific (springer ready) model that has mil dots and a nice cross hair reticle designed for hunting, no luck yet

Must dedicate some bench time for this.......

Edited by DaveS - 16 Sep 2022 at 4:06pm

dvlnme

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Posted: 16 Sep 2022 at 1:36pm

i used to use a battery heated sox i cut down to fit a co2 bottle worked really on cold days as kept co2 temps up so power didnt drop off on cold weather,and kept hands warm as well.

cheers mike

J-S

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Posted: 16 Sep 2022 at 11:46am

The cr600 is a co2 rifle, and if its running co2 then still a co2 rifle and no police issue.

Doesnt matter if it looks tactical, like a pcp, a machine gun or a bazooka..

J S Airguns
Air Arms TX200('s)
Theoben Sirocco
HW77
FWB 300s
Webley Patriot
One or two others...

Current projects:
Too many..

DaveS

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Posted: 16 Sep 2022 at 11:19am

Hi,

My first go a CR600 worked quite well, went for max volume in the transfer valve and ended up creating a new seat. Got 700fps with JSB 14.35gr pellets and a slight tightening of the groups as well at the higher power. The downside was 8-9 shots with liquid present and then a drop off to 15 shots where it was back the standard 480fps.

Hence my interest in Sodastream. I have 3 of the new alloy bottles 2x60L (605cc 0.75g tare) and 1x30L (460cc 0.52g tare) so the weight is not bad. Decision now is infront/behind of the trigger, has a better feel with it behind but that complicates everything relating to the gas path.

I'm a bit concerned that the creation is going to look very like a tactical PCP and that has Police issues. How do you prove it is CO2 not HPA ? This whole PCP classification is a clear as mud, the Police can just decide what a dangerous airgun is and that means trouble. In fact a CR600 at 700fps x 14.35gr is still 15.6fpe, is that really dangerous ?

The gas properties of CO2 are attached, the critical temp is 31C where you will have 1018psi above the line and liquid below. An unheated CO2 gun at 12C gets about 850 psi or 83% of what it could be heated.

Fps has many factors, barrel length, gas psi, transfer speed as a product of transfer area and the directness of path. A real design task, fun all round.

Edited by DaveS - 17 Sep 2022 at 9:09am

Billbobnz

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Posted: 16 Sep 2022 at 9:43am

Good morning DaveS

Check this out on the build I've done. Let me know if you want more details.

http://www.kiwiairgunners.co.nz/forum_posts.asp?TID=607

Author	Message Topic Search Topic Options Post Reply Create New Topic Printable Version Translate Topic
kruzaroad Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 02 Jul 2022 Location: Hastings 4 now Status: Online Posts: 1713	Post Options Post Reply Quote kruzaroad Report Post Thanks(0) Quote Reply Topic: Newbie Posted: 19 Nov 2022 at 8:34am
	Dude that sux. Was it in the sun, were you around when it went off. One more reason for me to stay away from gas, easily get to that temp in hawks bay sitting in car. Chances it was faulty metal?

mercs Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 24 Apr 2020 Location: Stratford Status: Offline Posts: 244	Post Options Post Reply Quote mercs Report Post Thanks(0) Quote Reply Posted: 18 Nov 2022 at 6:55pm
	Welcome from the west, good to hear some rabbits are for it. Look forward to learning more about your projects. Note to all - do not heat CO2 bottles or capsules, 31 degrees celsius sounds like a great performance enhancement but believe me over temperature is bloody dangerous, even left in direct sun they can become a real risk. Be Safe Mates

grbaker5 Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 15 Sep 2021 Location: Te Horo Status: Offline Posts: 10	Post Options Post Reply Quote grbaker5 Report Post Thanks(0) Quote Reply Posted: 04 Nov 2022 at 8:58am
	Very cool. Tempted to have a play with my Hammerli 850 .177 now... maybe a simple motorcycle heated hand-grip wrap from Aliexpress. Edited by grbaker5 - 04 Nov 2022 at 8:59am

Mic Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 21 Apr 2021 Location: Auckland Status: Offline Posts: 23	Post Options Post Reply Quote Mic Report Post Thanks(0) Quote Reply Posted: 17 Sep 2022 at 9:48am
	Welcome DaveS

Billbobnz Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 13 Jun 2020 Location: Ashburton Status: Offline Posts: 782	Post Options Post Reply Quote Billbobnz Report Post Thanks(0) Quote Reply Posted: 16 Sep 2022 at 5:49pm
	This is brilliant, do you mind if we all come and help/watch you build this. Please keep us in the loop with updates. Don't worry about the looks just make it look mean as. I want to make a bullpup version of the cr600w some day. Cool suggestion on the heated sock.

DaveS Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 15 Sep 2022 Location: Auckland Status: Offline Posts: 5	Post Options Post Reply Quote DaveS Report Post Thanks(0) Quote Reply Posted: 16 Sep 2022 at 4:03pm
	Hi, Good idea, I'm planning to make a custom transfer valve with an Oring at the front that will cover the sight port. A section of it will be turned down 5mm for heating coil windings with the wires exiting through the sight port. I'll have a thermo couple in there too setup for 31C and a LiPi battery pack in the butt. In front of that the plan is for a permanent plug that has a Sodastream thread and valve actuator. I'll use the 460cc bottle (about 20 12g powerlettes). I have a 4k carbon fiber tube as a barrel sheaf. I'll leave 50mm in front of the valve as a staging tank, I should get enough heat transfer from the alloy transfer valve to to keep this warm enough. The CR600 barrel is quite nice, got a bit of a choke and likes JSB 5.52s. The scope will be a Veyron 3-12x44. I would really prefer a compact fixed 4x32 with zero parallax at 40m. Light, simple, and cheap, I'm trying to get Vector Optics to build an airgun specific (springer ready) model that has mil dots and a nice cross hair reticle designed for hunting, no luck yet Must dedicate some bench time for this....... Edited by DaveS - 16 Sep 2022 at 4:06pm

dvlnme Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 30 May 2017 Location: taranaki Status: Offline Posts: 519	Post Options Post Reply Quote dvlnme Report Post Thanks(0) Quote Reply Posted: 16 Sep 2022 at 1:36pm
	i used to use a battery heated sox i cut down to fit a co2 bottle worked really on cold days as kept co2 temps up so power didnt drop off on cold weather,and kept hands warm as well. cheers mike

J-S Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Senior Member Joined: 19 Oct 2014 Location: Auckland Status: Offline Posts: 360	Post Options Post Reply Quote J-S Report Post Thanks(1) Quote Reply Posted: 16 Sep 2022 at 11:46am
	The cr600 is a co2 rifle, and if its running co2 then still a co2 rifle and no police issue. Doesnt matter if it looks tactical, like a pcp, a machine gun or a bazooka..
	J S Airguns Air Arms TX200('s) Theoben Sirocco HW77 FWB 300s Webley Patriot One or two others... Current projects: Too many..

DaveS Members Profile Send Private Message Find Members Posts Add to Buddy List Member Joined: 15 Sep 2022 Location: Auckland Status: Offline Posts: 5	Post Options Post Reply Quote DaveS Report Post Thanks(0) Quote Reply Posted: 16 Sep 2022 at 11:19am
	Hi, My first go a CR600 worked quite well, went for max volume in the transfer valve and ended up creating a new seat. Got 700fps with JSB 14.35gr pellets and a slight tightening of the groups as well at the higher power. The downside was 8-9 shots with liquid present and then a drop off to 15 shots where it was back the standard 480fps. Hence my interest in Sodastream. I have 3 of the new alloy bottles 2x60L (605cc 0.75g tare) and 1x30L (460cc 0.52g tare) so the weight is not bad. Decision now is infront/behind of the trigger, has a better feel with it behind but that complicates everything relating to the gas path. I'm a bit concerned that the creation is going to look very like a tactical PCP and that has Police issues. How do you prove it is CO2 not HPA ? This whole PCP classification is a clear as mud, the Police can just decide what a dangerous airgun is and that means trouble. In fact a CR600 at 700fps x 14.35gr is still 15.6fpe, is that really dangerous ? The gas properties of CO2 are attached, the critical temp is 31C where you will have 1018psi above the line and liquid below. An unheated CO2 gun at 12C gets about 850 psi or 83% of what it could be heated. Fps has many factors, barrel length, gas psi, transfer speed as a product of transfer area and the directness of path. A real design task, fun all round. Edited by DaveS - 17 Sep 2022 at 9:09am

Billbobnz Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 13 Jun 2020 Location: Ashburton Status: Offline Posts: 782	Post Options Post Reply Quote Billbobnz Report Post Thanks(0) Quote Reply Posted: 16 Sep 2022 at 9:43am
	Good morning DaveS Check this out on the build I've done. Let me know if you want more details. http://www.kiwiairgunners.co.nz/forum_posts.asp?TID=607