After reviewing..Airforce Sweet Spot 101 by Mac1 Airguns
Can someone please explain this in further detail for me. I know a chrony is a must for me to obtain buttttt that requires the wifes approval so in the meantime I would love to be able to fill my condor to 2900 psi each day after work and expect the same results as the day before. However I just can’t make it happen. This is with power setting on 7.5 with 28.4 Ej. I know its me being an idiot on understanding the bell curve and finding what psi, preload and pellet my gun likes. If someone could simply this to a Cajun idiots standard I would really appreciate it.
Matt
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How do you know your not getting consistent results?
I’ve never done this but… If I was without a chronograph I would base my tuning off of accuracy results first, at maybe 50 yards. I think this is a good distance to notice the effects of the pellets loss in velocity and groups should stay pretty tight.. Fill to 3000 and shoot, if the poi starts low
and goes up then that would mean that you have low velocities initially. Just keep shooting until the poi starts getting lower and lower. If you are ok with the power then try to determine what pressure range your gun shoots the flattest through and only shoot over that psi range.
If not then you can adjust the hammer spring to bring the velocity up at the higher pressures. I hope this gives you the general idea and just know you might already be at the top of your bell curve and only see a decline in poi. In that case i think you should lessen the tension in the hammer
spring. Good luck and maybe someone else has actually done something like this and will chime in.
So here is the deal:
1) All I am going to tell you is going to be farts in the wind until you get a chrony. It’s like trying to monitor an engine power/torque curve without knowing the engine rpm….
2) You have not made very clear what the issue is. That would help and also would help to make sure anout your expectations.
3) The bell curve. (it’s not really a bell, but who cares):
a) First thing first, I am sure you understand that every time you shoot, your tank loses a bit of pressure.
b) you also should understand that the tank pressure pushes on the valve to keep it close.
c) you need to slam the valve with a hammer wait to release air.
Are we cool so far? cause mow is were the fun part begins
Since we know that we are always going to lose pressure, we want to tune the rifle so that instead of having the velocity decrease with pressure, we trick the system so the first few shots are actually going faster as we lose pressure and then drop again. This way our average velocity and velocity spread is contained (say 850 860 870 880 890 880 870 860 850) instead of (890 880 870 860 850 840 830 820 810). calculate your own average. you get the point.
How do we trick the system?
simple enough, if the pressure is a bit over a certain point, the hammer will not open the valve all the way cause the pressure in the tank wins a bit. after the first shot the pressure in the tank is lower so the second shot can go a bit faster. At one poi though, the hammer will start always winning and the pressure in the tank will be a lot lower that the start so the speed decreases again.
It’s a game of balance between forces.
How do you figure out the balance point and the curve? (please say I get a Chrony)
You got it! you get a chrony so you figure that maybe ypu are starting with to much power for 2900psi. if you dial down to who know what value without a chrony, then you would make the hammer a bit less eficient at the beginning and thus start on the ascending side of the curve.
others like to lower the starting pressure, but again it depends on pellets weight, barrel and pressure, etc. only the ____ (if you filled in with chrony you got the point) will tell you where you are on the curve.
In you case it’s probably too much power wheel (hammer) for that pressure.
4) about your expectations: unless you have a regulator on the tank. you will learn to compromise the number of shots vs the velocity spread. The more power you want to least number of shots will have a consistent velocity around the cusp of the curve.
For my hunting rifle I accept 7-10 very accurate powerful shots, for my plinker I take 50 with a wider spread.
Now you can tell the bell curve story to your friends and sound cool.
Just get some nice gift for the wife, make her happy an be polite. She will buy the chrony for you.
cheers
Chris
I just got a Talon SS and out of the box I can hit a beer cap hanging from a string at 35 yards just about every time from a sandbag. I can hit it if I am at 3000 PSI all the way down to 2000PSI and any were between. It is a bone stock .22 with the PW set at 6. All I have put in it is 14.3 crosman pellets. I have not shot at paper yet only had it for like three weeks and less the a tin of pellets. I am having fun with it as is now I think some people overthink stuff sometimes, just shoot it and have some fun :2cents:
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Blacktalon,
I agree with you but unfortunately I am an over thinker (should have been a engineer). I hope it doesn’t sound like complaining because I am enjoying the heck out of this gun!
Chris,
Honestly my expectations may be unreal for a slightly modified Condor. I purchased the gun for hunting and long range plinking. My expectations are simple… 10-15 shots, generating 40+ fpe (eventually more, much more) with consistent results i.e. sweet spot.. My poi has been a bit shifty. I know its not the basics like scope, cant, my hold etc. (shot FT for a few years with a maccari/venom Tx200 mk2) as the sound of my report almost changes daily.
Your explanation of the bell curve hit home. I understand exactly when you mentioned the two forces… the valve/backpressure vs hammer strike.. Thank you!! :8: Now I need to obtain a chrony!!
Sharpshot,
This right here: “Fill to 3000 and shoot, if the poi starts low and goes up then that would mean that you have low velocities initially. Just keep shooting until the poi starts getting lower and lower. If you are ok with the power then try to determine what pressure range your gun shoots the flattest through and only shoot over that psi range.”
should keep me busy until the chrony purchase. 😛
Thanks brethren, not often you find patient wise guys who don’t mind dealing with the noob.
Matt