drop the FPS just abit

[Wegalaxy]

Hello,

 

I play at FAO sites indoor and there limit for .25s is 307 fps.

I use a arp 9 with a gate aster with a fairly new piston and seal installed (run on 11.1 lipo)

My gun is shooting 312 fps on .25. 

Which is annoying as I want to use it indoors and out.

 

How do I drop the FPS ever so slightly without changing the hop up or changing weights?

 

Use it more?

 

Leave it in pre cocked over night?

 

Drop down to 7.4 lipos?

 

Thanks 

 

[JVacation]

You can try leaving it pre-cocked, just be careful with it and don't leave it too long.

 

The main thing to remember is that chronos read differently between each other. Even the same brand and model can read differently. I know that my chrono reads about 10 fps higher than the one at my normal site. No real idea which one is correct. 

 

If you can't get it lower by leaving it on pre-cock you can also try changing the springs or shortening your spring but I don't think the arp 9 has a straightforward spring change.

 

Another option is looking at the bore and length of your inner barrel. 

 

 

[Jez_Armstrong]

Use it more? ..............yes

 

Leave it in pre cocked over night? ............yes

 

Drop down to 7.4 lipos?..............no, batterys make no difference to FPS

[Rogerborg]

14 hours ago, Wegalaxy said:

I play at FAO sites indoor and there limit for .25s is 307 fps.

 

Oh, those... special people. Their rules are all over the place, they have this silly concept of a "limit" (which is no such thing) and a "variance" (the actual limit). Their figures are wrong too:

 

0.2g x 328 fps = 0.99J

0.25g x 289 fps = 0.96J

 

0.2g x 350 fps = 1.13J (not the 1.1J they claim)

0.25g x 307 fps = 1.09J

 

Why not just use 0.2g and see what you chrono at with that? There's no particular advantage to 0.25g at CQB ranges.

 

[Cannonfodder]

7 hours ago, Jez_Armstrong said:

Use it more? ..............yes

 

Leave it in pre cocked over night? ............yes

 

Drop down to 7.4 lipos?..............no, batterys make no difference to FPS

This

5 hours ago, Rogerborg said:

Why not just use 0.2g and see what you chrono at with that? There's no particular advantage to 0.25g at CQB ranges.

It could be argued that .2g is better for cqb as the higher fps means a shorter flight time for the bb. Potentially an advantage when targets are only visible for fractions of a second

[Rogerborg]

13 hours ago, Cannonfodder said:

It could be argued that .2g is better for cqb as the higher fps means a shorter flight time for the bb. Potentially an advantage when targets are only visible for fractions of a second

 

Yup. The only argument for 0.25g is that Captain Platecarrier is perhaps slightly more likely to feel it.  But I just run 0.2g, it's what it's for.