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JonDewhirst

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Reply with quote  #1 
I know the uk version of the LVOA is slightly downgraded, but I’ve just bough one and it’s chronoing at 280fps. That can’t be right, can it?

This is at a site chrono, using their mags and 0.20g BBs.

I’m using 0.25’s during game play and getting ok distance but the flight of the BBs is far from flat. Tried adjusting hop, not really having much affect.

I’m using a 7.4v LiPo as recommended.

Any help gratefully received.

JT
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Adrian Whiting

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Reply with quote  #2 
Hello,

Your muzzle velocity reading may be about right, depending upon your hop up setting when you tested it.

It may also depend upon which model of LVOA you have.

At the risk of initiating a debate at a tangent, the UK muzzle energy limits are based on the maximum muzzle velocity achieved for a given pellet weight. The law takes no account of hop up setting to improve flight, so in effect the manufacturers have to ensure the airsoft gun does not exceed the muzzle energy levels with the hop up dialled off.

I have both a LVOA C and an S model, from the early batches. With the original springs I chrono’d the muzzle velocities of the S at a couple of hop up settings. These are my results;

Krytac LVOA C
Hop up "10"
0.2bb = 300fps

Krytac LVOA S
Hop up "3"
0.2bb = 324fps
Hop up "10"
0.2bb = 303fps
0.28bb = 245fps

As you can see, the S has some difference between hop up setting 3 and 10. With mine the S and C models seemed to perform the same, but there may be a difference with other examples.

Either way, these readings indicate a reasonable margin within the UK thresholds.

In another thread, someone has swapped their main springs for M105s, and appears to stay within the UK thresholds too.

I hope that helps,
Adrian

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JonDewhirst

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Reply with quote  #3 
Adrian

I have the C

This was with .20 pellets. Hop up was mid range.

280 seems very low given what you’ve said.

Jon
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Adrian Whiting

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Reply with quote  #4 
Hello Jon,

Yes, in that case I might have expected readings around 310fps.

Hopefully the site chrono is accurate (given what you say about trajectory) but perhaps you could check those readings with another chrono to make sure, and then contact your retailer? I expect they will have obtained it via Shield, it if not then they may have obtained one made for other jurisdictions (I think those for Italy have a less powerful mainspring). The Shield ones will all have been UK spec.

I replaced my OE springs with M105s, but I appreciate you are more concerned with whether your AEG is right in the first place. Is your AEG at least consistent?

Adrian


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JonDewhirst

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Reply with quote  #5 
Adrian,

I have a mate who has a chrono, he’s going to give it a look for me this week.

Is it consistent? Yeeeees, but very much “meh” when I was expecting “wow”. And yes, I want it to be right before I start looking at upgrades to solve the issue.

Thanks for taking the time to reply.

Jon
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Adrian Whiting

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Reply with quote  #6 
Jon,

I expect you may have had a look too, but I just went back to the Krytac main website to check the spec sheets for the C. The UK model should be giving approx 330fps minimum (hop up set to 3 I think). The versions for Italy and Japan are both listed as 290fps. You may want to check with the retailer as to the source?

Otherwise it suggests you have a consistent leak or mainspring type issue, but I am out of my depth in relation to solving those types of issues, beyond replacing parts, I am afraid. There are plenty of threads on here about doing so, but I guess you want to be certain that something is wrong (and what it is). I would just try and confirm that you have a UK version to start with.

Are you able to compare the performance with any other LVOA-Cs? If not, and you happen to be near Dorset, let me know!

I hope it can all be resolved.

Adrian

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JonDewhirst

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Reply with quote  #7 
Adrian.

You seem like the man in the know. Is there an easy way to tell what spec it is? Will the serial number give it away? Accompanying paperwork?

I’m going to be mighty pissed if I’ve been sold a non uk spec one.

Jon.
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JonDewhirst

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Reply with quote  #8 
Cancel. The box shows it as a BK03. Uk version.

So it must be faulty in some way.
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Adrian Whiting

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Reply with quote  #9 
Hello Jon,

Yes, that is the UK version. It does then seem it has a problem. Best to go back to the retailer and see what they say they can do to help.

I work on a part time basis for Shield, the UK importers, but more to do with their licensing and the sights. I just happen to enjoy Airsoft as well, so try and help on this forum when I can. I expect you will know, your consumer protections are with your retailer, but I am happy to try and help too.

Adrian

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JonDewhirst

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Reply with quote  #10 
Cheers Adrian, appreciate your advice

Shop have said they’ll have a look, and will get it up to 320. They also asked if I wanted to upgrade to 349 for the cost of a spring while they have it open.

Of course I do!!
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Adrian Whiting

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Reply with quote  #11 
That sounds a solid plan Jon!
I replaced my mainspring with an M105, which achieved something similar.
I wish you every success with it, on the skirmish field, unless I happen to be in your sights of course...!
Adrian

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JonDewhirst

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Reply with quote  #12 
Quote:
Originally Posted by Adrian Whiting
That sounds a solid plan Jon!
I replaced my mainspring with an M105, which achieved something similar.
I wish you every success with it, on the skirmish field, unless I happen to be in your sights of course...!
Adrian


So, I’m back.

After returning it to the shop they found the hop rubber was degraded. They swapped it out. I later found they used a non Krytac one. I put in a Krytac one. Happy days.

Until today. Chrono with .25s. Started at 280. Jump to 320 for one shot. Throughout the day checked it 4 times. Ended up at 260fps.

Any ideas?

There was a suggestion of an air leak. And a suggestion that oiling the bucking might help, but I know krytac bucking don’t like oil.

Change to a different bucking?
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Kraken_Wrangler

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Reply with quote  #13 
I need a baseline measurement if you can get that for me.

1. The type of chronograph
2. The type of bb
3. The hopup # setting
4. The brand of the 105m/s spring

Then, I need you to change the parameters to the following:
1. use 0.20g bbs for the chrono
2. use the #3 setting on the hopup

This will give me a calculable reading that I can scale.
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JonDewhirst

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Reply with quote  #14 
        I need a baseline measurement if you can get that for me.

1. The type of chronograph - no idea. It was at a skirmish site
2. The type of bb - Hornet Tactical 0.25s
3. The hopup # setting - #8
4. The brand of the 105m/s spring - it has the standard spring in it. It was the other chap who put a 105 in.

Then, I need you to change the parameters to the following:
1. use 0.20g bbs for the chrono
2. use the #3 setting on the hopup

I don’t have a chrono at home so won’t be able to do this straight away.

Sorry not helpful, I know.
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Adrian Whiting

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Reply with quote  #15 
Hello Jon,

Sorry to hear you don’t have a fix just yet. I appreciate you will try and sort the chrono testing KW has suggested above but it may just be worth making sure that you haven’t lost the spring (part KAO18 10U on the diagram in the library here), that sits around the outer barrel. In another thread someone has had similar velocity problems and the cause was a missing spring.

Just a thought,

Adrian

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