Fps reduction
 

Hello guys

I am half way in my p90 project.
As of now I get 380 fps. This is good but I would like to bring it down for CQC. I'm looking for 350 around.

I was thinking of modifying the silencer to cross drill holes to reduce the forward air pressure and bring the fps down.

Has anyone done this... is this a good idea or bad?

Thanks

another way is just to change the spring.

wont work... change the spring (m90 or m100)

Drilling holes in the silencer will have no impact on the FPS. Better way is to change the spring ;)

I know about changing the spring. Thanks

But I was looking for a way to get the fps up and down with out changing the spring.

I though it could be a way..

Nope, only way is to change the spring or use a velocity reducer (which are not that reliable, and don't work in full auto)

OK thanks

oo i forgot to add one thing. you can try use heavier BBs.

No, that does not work. We impose limits by energy, not FPS.

Changing to a different weight BB will not change anything.

You can buy an ICS L85a2 only electric gun that alows you to change fps without changing your spring

fail

Really?

a gun that shoots 328 FPS on .20 fires 1 joule on ANY weight of BB you put through it.

if the limit is 350 FPS on .20 BB you can't use a gun that fires 349 on .88G BB's.

That is correct, however usually when you chrono at a game or event everyone is made to chrono with the same wheight of bb and then checked to see if they are under the limit.

Around here on the Praries it is 400fps with .20's for guns with full auto for outdoors for the limit.

So it does not matter that a 440fps gun with .20's shoots, 398fps with .25's because everyone is made to chrono with .20's.

I hope I made that clearer...

Cereal:

Work=Force*Distance --> Joules = (Newtons) * Distance

A BB is measured in grams (you can easily convert to newtons based on earths atmosphere/gravitational pull).

At the instantaneous pushing of the BB, when it exits the barrel you can measure FPS or Joules. They are related and therefore and be converted from one to another.

We say FPS because it's so much easier to understand for people with "simple minds" (eg. arts/humanities majors). It would be more correct to measure with Joules however I doubt we're going to be playing outside of earth anytime soon (where newtons instead of mass is applicable). FPS vs Joules is very much like imperial vs metric measurements, they're interchangeable you just need to know the equation to convert from one to another.

EDIT: As Acer Pointed out wrong formula.... I'm not a physics guy I'm a CS guy, I just plug the numbers into the equations and if they don't work out make a small tweak and recompile.

Thank god that I don't build buildings or bridges, I would complete it half way, do a test run with a few cars, see what happens and edit and recompile. :D It would be worse if I setup a cronjob to run a few cars over every day to see the progress of the bridge I'm building too. :D

Never heard about this. What is it exactly?

Thanks