Question for anyone interested in the E-TaCREG
Guys,
Working out the final details on the E-TaCREG. (This is the E-TaC for the HPA bottle)
What velocity do you guys want out of a 24-inch barrel?
Thanks,
Jim
All Replies
16.9 gr gamos
12″ 22 barrel
769 ave. High 771, low 765
36 shots
22 ci tank.
Jim
OK guys, what do you think?
28 shots
average 916fps High 921, low 912
22cal 24″ barrel
16.9gr Gamos
Oh….and a warm 22 ci. bottle!!
😯 😯 😯
Next is the 12″ barrel.
Jim
ok I see what you are saying I was thinking in a different matter I do that all the time just trying to get it straight in my head do you know what Airforce Edge uses and what they use in the Edgunas far as a regulator they are both in the tank correct? I think that info would be very helpful 😉
Eddie,
Not the long skinny tube itself, but a long skinny “regulated chamber” that is no good. The reservoir can be any shape. You just need to get the air out of the regulated chamber as fast as possible without a long drop in pressure.
Sorry if I was confusing.
Jim
Marmont I know little of what you are trying to do just read and watch and scratch my head! anyway you were saying that a long skinny air tube is not a good choice? Just for an example take the Edgun long skinney tube and some of the strings and shot count they are getting what are they using besides the long skinny air tube? regulator has to be in the tank I am assuming? thanks Eddie
Hey Shoots,
Many an iteration has been drawn up. Unfortunately, long skinny tubes are the very worst. The pressure gradient from front to back makes them a poor choice. My design is going to be short and fat. The E-TaC itself may be larger in diameter to provide the necessary volume without increasing the length.
Also, larger chambers make for more efficient regs so I’m going as big as possible without making it silly.
Dave’s volume is approx 1.5ci. That’s a monster.
Regarding the E-TaCREG:
Doing some data collecting I’ve found that the 12″ barrel will actually shoot faster than the 24″ with the same setup. I’m guessing the losses are to friction. Also, the larger volume’d E-TaC does not give any additional velocity to the 12″ barrel so appox 800fps may be the max on it. Again, this is at 2000psi.
I’ll continue adding volume until I get to 950 or so on the 24″ barrel and let you know what I find.
Regards,
Jim
Jim
For a talon valve it will require a working pressure of about 2500 to achive velocities in the mid to high 900s , but for the condor valve, 1800 to 2000 psi will achive the same velocities .
Also , on your work to come up with a regulated E-TaC for the standard AF bottle , would it be possible to machine the back of the valve spring retainer to accept a long pre-chamber tube with a regulator on the back of that ? I know the limiting factor would have to be a very small diameter to fit inside the bottle but it could be almost as long as the bottle, A reg may not be able to be that small a diameter, just don’t know. I guess if this would work someone would have already done it but its a thought ,
Now THAT’S what I’m talkin about.
Thanks SS&SU.
I’m on it.
Jim
Jim
I’m shooting a condor 24” barrel with a modified talon valve, After trying many pellets , nothing seems to shoot as well as 18g JSBs . So I guess my perfect wish list would be 18g JSBs at a velocity of 950 to 960 for a 30 to 40 shot string.
Marmot, Using a regulated volume of a 100mm of 18mm hole (Cant be bothered to work out the volume)
I got 960 fps from a slightly modified talon valve, an 18″ .22 barrel shooting 18.1 grain JSB’s
Hope that helps.
Dave
.22 caliber
Stock Talon valve
stock EVERYTHING else.
As mentioned before, the E-TaCREG is not going to be the uber-power monster mod for the big-bore supersonic crowd.
I’m going to see what the AF CO2 adapter does, better it by a bunch and go with that.
Regards,
Jim
ps: no offense meant, Pab. 🙂
Lol, none taken Marmot 😀
Just trying to give you some numbers is all 😉 😀 😀
I guess I’m going to have to put a disclaimer about 13 pages long on this one.
.22 caliber
Stock Talon valve
stock EVERYTHING else.
As mentioned before, the E-TaCREG is not going to be the uber-power monster mod for the big-bore supersonic crowd.
I’m going to see what the AF CO2 adapter does, better it by a bunch and go with that.
Regards,
Jim
ps: no offense meant, Pab. 🙂
at 2000psi, my .25 Jsb (25.4g) will do about 1000fps on a blodnob valve,about 920 with a kodiak.
Not going to be possible in .22 at 2000psi, I don’t think.
I’d like to know what you guys are getting from your reg’d HPA bottles and Airforce C02 Adapters with 24″ barrels. (in .22)
I do know I have a lot more volume in my E-TaCREG than in the AF C02 Adapter so I’m wondering what you guys want.
Does anyone have a 24″ .177 barrel they wanna let me borrow…or work out a deal for something I can provide… for me to do some testing.
Tax season has me in a tight spot.
Regards,
Jim
- You must be logged in to reply to this topic.
51 shots
887ave 901 high, 864 low….some of the pellets did not fit well, hence the good SD, but high spread (36fps, very few were that high or low)
SD: 5
16.9gr Gamo
22ci bottle.
No comments yet???
JIm
PS: I don’t have any 18gr JSBs. Will the 16g be ok for testing?