Reply With QuoteA S410K in .22
They are all different though, you really need to chrono your own gun.
Somebody must love me.......
Power Curve On S410k
I have an Air Arms S410 carbine and I was wondering if anyone has information on the power curve.
I pump it up to 190bar, then take SIX "dry shots" to get it into the right part of the curve (AT A GUESS!!). Then it's load up time and off into the field.
As I do not have a chrono at the moment I am wondering if I am doing the right thing. Any advice please would be welcome.
I usually repump when the pressure reaches 150Bar. What pressure can I let it get down to before I need to repump?
The gun was second hand and the pamphlet that comes with it is next to useless (AND it was the original pamphlet!!)
Many thanks.
I AM NOT RACIST, I HAVE A COLOURED TELLY
A S410K in .22
They are all different though, you really need to chrono your own gun.
This is one I did earlierOriginally Posted by SNAKEBITE
http://www.airgunbbs.com/showthread....707#post594707
As you can see its not untill about 30 shots in that the rifle produces its best, giving around 40 best shots, then dropping of again.
Re-filling at 150bar is the worst thing to do as thats about the right pressure of the sweet spot.
Re-fill around 110-120Bar.
Hope that helps.
I do all my own Stunts
This is for my classic I'm sorry about the format but I couldn't work out how to transfer it over from EXEL. This rifle obviously gains power as the pressure drops in the cylinder and as can be seen around the 60 to 80 shot marks is at its peak. As a result of this test I turned it down a bit.
S 400 200 bar fill power curve
String
1 08.44 gr Daystate FT 0.177 782.1 776.1 777.7 778.6 781.1 780.9 776.5 775.9 775 783.4
2 08.44 gr Daystate FT 0.177 785.6 783.4 781.7 783.5 782.5 780.1 781.5 787.5 778.8 781
3 08.44 gr Daystate FT 0.177 789 789.5 782.8 794 788.6 786 783.5 781.6 786.5 783.8
4 08.44 gr Daystate FT 0.177 791 792.8 790.9 785.8 791.3 789.5 791.1 779.3 784.7 785.3
5 08.44 gr Daystate FT 0.177 786.7 797.6 790.9 786.1 789.7 790.5 788.9 782.4 788.1 794.9
6 08.44 gr Daystate FT 0.177 792.3 795.9 796 809.2 798.9 807.4 796.4 791.3 794.4 795
7 08.44 gr Daystate FT 0.177 807.5 801 802.8 794.7 807.2 800.6 804.2 805.1 807.6 817.7
8 08.44 gr Daystate FT 0.177 804.9 807.4 805.6 816.3 800 795.6 800.7 797.3 796.6 805.8
9 08.44 gr Daystate FT 0.177 802.8 803.5 801.4 800.6 796.5 799.6 797 808 803 799.6
10 08.44 gr Daystate FT 0.177 796.2 792.9 796.2 789.4 792.3 793.2 806.9 808.2 805.7 799.2
11 08.44 gr Daystate FT 0.177 774.4 781.2 784 787.1 772.5 789.5 785.3 791.3 792.7 788.8
12 08.44 gr Daystate FT 0.177 760.4 764.3 763 764.8 764.3 769 768 767.6 777.1 778
Banned
As already stated you want to chrony the gun to get the best idea of it's power curve.
Below is a link to a graph of some tests I did on mine - 100 shots from a fill pressure of 200bar (actually 220bar as I used my pump and the gauge is crap and consistantly under-reads by 20bar compared to my bottle).
From it I found that for my rifle the ideal fill pressure is about 195bar (actual pressure), I get about 40 good shots from this, with a refill pressure of about 150-155bar.
The three different plots are for different transfer port restrictor screw positions - the more you wind it in the lower the velocity becomes, but the power curve also becomes flatter and the refill pressure higher as you're using less air per shot.
It's worth doing it yourself with a chrony as there are obviously a lot of variables between users; gauge calibration, valve inconsistancies, pellet choice etc...
Have fun tinkering
P.S. How come we can't directly link to pictures on this forum?
Last edited by theboymike; 29-09-2005 at 03:42 PM. Reason: Spelling..
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