Increase or Decrease Joule

Fastforward · May 9, 2022

Hello,

Last game my SSG10-A3 was rejected for beiing over the joule limit (limit is 2,3J).
I tested this setup at home and it was under the joule limit by 0,11J after the game the same setup was 0,06J over the limit, how is this possible? (rapax 3+ spring)
Now I installed the rapax 2+ spring and I only get 1,55J even with 12mm of adjuster rings I only get 1,7J is this normal to get this less of an increase with the fps rings?
How much do I need to cut off from the rapax 3+ the get below my field limits?

SiliconeSword · May 9, 2022

It sounds like there was maybe a temperature difference, there's a faulty chronograph, or something else weird going on.

One thing it could be is air pressure/elevation, as when I go to my field I have a decrease from 2,543 feet to 880 feet, so I lose a bit of power since I use HPA.
With springs I think you'd gain power at a lower altitude, as the air would be more "springy" due to more "air" in the air.

AsianGuy · May 9, 2022

Unless you or the field has inaccurate chrono’s my experience is that they are pretty consistent with less than .05 J error. (do they have some odd open air or paintball chrono?)

Is your spring BRAND new? I found springs that are brand new and sub 500 shots/pulls could be inconsistent in their energy output. Mind you, not .2 J inconsistent. However my maple leaf, laylax, guarder, evike, shs, and matrix spring experience all has shown me varying degree of spring settling (varying from .1 to as much as .3J)
I don’t know if anyone does this…but for me…when I’m trying to just get RIGHT up to the joule limit. All I do is heat the spring and compress it down by a couple of millimeters. It works out well when I’m trying to drop it by .1J. However I’ve never heard anyone else doing this – however it’s work out very well for me.

Fastforward · May 9, 2022

I have a x3200 mk3.
The spring has less then 500 shots.
The spring is a rapax 3+ and now rapax 2+

Skara · May 9, 2022

Did you test with and without the hop set?
How did your field chrono your gun?

Fastforward · May 10, 2022

I only tested it eith the hopup set snd the field test it how I presend the replica to them.

JeremiahPate'sAirsoft · May 10, 2022

When you chrono decrease the hop by a lot and you should be fine. You shouldn't have to cut it

Fastforward · May 12, 2022

What should be the inner diameter of the cylinder because mine is 21.7mm and if I buy the drill fluted cylinder will this be tm-spec.
SSG10 Drill Fluted Cylinder - Novritsch | Airsoft

1tonne · May 12, 2022

If you do need to bring the energy down a little just wrap some solder around the piston and then a layer of tape to hold it on. This should slow the piston down enough for you.

Fastforward · May 13, 2022

1tonne said:
If you do need to bring the energy down a little just wrap some solder around the piston and then a layer of tape to hold it on. This should slow the piston down enough for you.

But with the stalker piston the novritsch cylinder is to small and I have to use heavier spring to overcome the more friction the piston has, if I move to a smaller spring the Joule drops down way more then I think it should

FatAndy · May 13, 2022

Not to be daft but have you greased the piston glide rings?
My SCW piston is relatively tight with the tolerances of the inner diameter of the cylinder.
I found my FPS more consistent and a little higher when it was properly lubricated.

Also is the piston new along with the spring? Are you using an air break but not before?

SiliconeSword · May 13, 2022

You could always sand it down a little, or get a replacement set and sand them down

Fastforward · May 24, 2022

I received the action army cylinder and it fits perfectly with the stalker piston.
Now I want to make it more silent so I made the airbreak longer and the FPS dropped, to increase the fps I added a FPS adjuster ring (8mm) on the springguide but the fps stayed the same.
What could be the problem?

Fastforward · May 24, 2022

FatAndy said:
Not to be daft but have you greased the piston glide rings?
My SCW piston is relatively tight with the tolerances of the inner diameter of the cylinder.
I found my FPS more consistent and a little higher when it was properly lubricated.

Also is the piston new along with the spring? Are you using an air break but not before?

I greased the piston glide rings and used the airbreak from the beginning

FatAndy · May 24, 2022

What FPS are you getting?
Are you measuring with 0.2s or your desired BB weight (for example I measure in both 0.2, 0.43 and 0.48s depending on the sites I’m plying at).

If you have the stalker piston isn’t that weight adjustable (Scorpion)?
If so adding weight to the piston will quieten it down, reduce FPS with lighter BB but can drastically increase FPS/Joules with heavier BBs.

Fastforward · May 24, 2022

FatAndy said:
What FPS are you getting?
Are you measuring with 0.2s or your desired BB weight (for example I measure in both 0.2, 0.43 and 0.48s depending on the sites I’m plying at).

If you have the stalker piston isn’t that weight adjustable (Scorpion)?
If so adding weight to the piston will quieten it down, reduce FPS with lighter BB but can drastically increase FPS/Joules with heavier BBs.

I am getting around 365 fps, I use 0,3 gram bb's because that is the weight it is used to chrono with and play with 0,4 gram bb max weight.
So by changing the heavy parts for the lighter one it should increase the fps, but why does the fps adjuster ring not increase the fps.

FatAndy · May 24, 2022

It’s funny you say that because I had a similar thing happen to me when it made literally no difference with my Rapax RMS 2J spring.
Unfortunately I don’t have a definitive answer.
I’d suggest trying to Chrono with 0.4s too unless your site measures with 0.2s only or it’s joules based.

Fastforward · May 24, 2022

FatAndy said:
It’s funny you say that because I had a similar thing happen to me when it made literally no difference with my Rapax RMS 2J spring.
Unfortunately I don’t have a definitive answer.
I’d suggest trying to Chrono with 0.4s too unless your site measures with 0.2s only or it’s joules based.

The chrono weight is 0,3 and it is joules based, the max weight to play with is 0,4 for a sniper.

FatAndy · May 24, 2022

Okay so out of curiosity, can you try shooting a 0.4 through your Chrono (I know it’s set to 0.3) and let us know the FPS or use this link to see what the energy/joules are.

If you’re measuring fps it doesn’t matter the weight as it’s just measuring the time between two points.
But we can convert that time and weight of the bb into joules ourselves using a converter.

Zero One Airsoft FPS & Joules Calculator

Input your details into our handy calculator to convert your guns velocity / energy between different weights of ammunition.

www.zerooneairsoft.com

Fastforward · May 24, 2022

FatAndy said:
Okay so out of curiosity, can you try shooting a 0.4 through your Chrono (I know it’s set to 0.3) and let us know the FPS or use this link to see what the energy/joules are.

If you’re measuring fps it doesn’t matter the weight as it’s just measuring the time between two points.
But we can convert that time and weight of the bb into joules ourselves using a converter.

Zero One Airsoft FPS & Joules Calculator

Input your details into our handy calculator to convert your guns velocity / energy between different weights of ammunition.

www.zerooneairsoft.com

With 0,4 I shoot 2,1 joules and the FPS is 335
With 0,3 I shoot 1,8 joules and the FPS is 360

Increase or Decrease Joule

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SiliconeSword

AsianGuy

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Skara

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JeremiahPate'sAirsoft

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1tonne

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FatAndy

SiliconeSword

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FatAndy

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FatAndy

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FatAndy

Zero One Airsoft FPS & Joules Calculator

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Zero One Airsoft FPS & Joules Calculator

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