S510 odd chrono results

S510 odd chrono results

Postby Lebon » Fri Apr 21, 2017 2:01 pm

Afternoon Guys
I have an s510 ultimate sporter, I' bought the rifle new a couple of weeks ago and have put approx 500 pellets through it
Today I had the chance to borrow a mates chrono and decided to do some testing at my local range.
I'm not new to pcp air rifles as I also own a 410 carbine and I'm familiar with power curves etc
I filled the s510 to 190 bar to shoot a 60 shot string over the chrono, and the results were quite strange.
Instead of the numbers increasing and then settling out and then dropping as they do with my s410, they started high and just decreased.
The results as follows
784.1
783.6
783.6
780.6
783.8
782.5
784.4
783.4
782.3
784.2
Pressure reading from gun was 175 bar approx
2nd magazine
784.6
784.8
782.4
781.8
779.1
782.7
775.6
775.6
767.7
777.0
Pressure reading from gun 140 bar
3rd magazine
774.3
770.9
768.0
768.8
766.8
765.2
762.6
765.5
758.2
755.0
Pressure reading from gun 135 bar approx
4th magazine
759.2
755.4
755.6
757.8
752.8
749.3
746.3
748.6
741.5
739.4
Pressure reading from gun 120 bar approx
5th magazine
737.8
728.1
736.2
725.2
720.4
715.9
717.4
712.6
708.9
703.8
Pressure reading from gun 110bar approx
6th magazine
708.8
702.5
697.2
692.9
697.0
687.6
686.8
687.5
681.8
675.1

This wasn't the results I was expecting and looks odd.
Can anybody shed any light on this, is it normal or do I have a problem
Thanks in advance Tony.
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Re: S510 odd chrono results

Postby Mtl_Biker » Fri Apr 21, 2017 5:34 pm

I can't comment on those figures (yet) as my own S510 Ultimate Sporter will only be arriving on Tuesday. (Been hoping it would arrive for this weekend, but alas.)

Is your gun .177 or .22?

Mine will be .22.

I'm guessing that yours is the 12 ft lb version? Mine is the Xtra FAC, but if yours is also, are you running it at full power or some other setting?
AA S510 Xtra FAC Ultimate Sprorter *CARBINE* .22
CZ200S "Green" .177
AA S400 MPR FT .177
Steyr EVO 10
Feinwerkbau 800 Evolution Top
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Re: S510 odd chrono results

Postby Lebon » Fri Apr 21, 2017 6:02 pm

It's .177 and sub 12ft lbs, I just can't understand why I have t got a power curve as you'd expect from a non regulated gun
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Re: S510 odd chrono results

Postby gdavison » Fri Apr 21, 2017 8:42 pm

cant comment as to what is "wrong" .. I have a two Ultimate sporters .. ones regulated / tuned etc and one original .. my original non fettled one does not have a drop off curve like that .. between 190 and 10 bar its +/- 20 fps

Sorry cant hep but agree yours is bizarre
AA S510 Ultimate Sporter .177 RatWorks Tuned - Hawke SW 4-16*50
AA S510 Superlight RatWorks Tuned - Hawke SW 4-16*50
AA S510 Ultimate Sporter - Hawke SW 4-16*50
AA S510 30 Year Anniversary .22 - Hawke Panoramic 4-12*40
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Re: S510 odd chrono results

Postby Roger5 » Fri Apr 21, 2017 9:18 pm

Could be the power adjusting screw, they can turn themselves in and reduce the power sometimes, I have seen this happen on a couple of S510s at my club, they start off high and slowly reduce in power, just like you are experiencing. Rog
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Re: S510 odd chrono results

Postby Lebon » Sat Apr 22, 2017 6:13 am

I assume the grub screw would locked in place by another crub screw though, unless a second grub screw wasn't fitted.
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Re: S510 odd chrono results

Postby Blackbaronfish » Sat Apr 22, 2017 7:34 am

They used to have a second grub screw. Due to the fireing pot being out of adjustment,some grub screws may have been unscrewed to correct the power level and then not leaving any room for a lock off.

BBF
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Re: S510 odd chrono results

Postby Lebon » Sat Apr 22, 2017 7:54 am

Ok I see what your saying, so I guess it's going back to AirArms then.
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Re: S510 odd chrono results

Postby Archer50 » Sat Apr 22, 2017 1:23 pm

Two thoughts. First, are you sure you filled to 190 bar or thereabouts? These results would be perfectly ok if they were just the second part of the power curve and the gun had only been filled to say 150 bar. Did your cylinder gauge and your gun gauge both agree on 190?

Second, could this be a chrono problem? Can you try another one? It doesn't look like it, but I've done a lot of work with a lot of chronos lately and found that quite a few of them are way out and can give really strange results.

Other than that, since it's a new gun, I agree, back to AA.

Alan
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Re: S510 odd chrono results

Postby Mark112 » Sat Apr 22, 2017 3:25 pm

Hi,

As the above poster says. It does look like the back end of a normal power curve and has only 18 shots in the sweet spot :shock: As they share the same valve components then you should get a curve like your S410's. Are you sure it is a 190 bar fill. Is the dive cylinder's gauge reading correctly?

Mark
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