Air Chamber volume on a Cocker

[fatmcgav]

Hey there,

I'm doing my A2 physics project, and i need to know roughly wat volume the air-chamber is - the section in front of the valve???
If anybody knows the volume, or the dimensions so that i can work it out, would be greatly appreicated.

Cheers
Fatmcgav

 

[Edd Hobday]

Not the answer to your question but, what you doing your project on?

 

[fatmcgav]

Originally posted by Edd Hobday
Not the answer to your question but, what you doing your project on?

How the input pressure affects the velocity.
Lol, i'm straying into 1st Yr Degree level physics for my A2 project :S :S

Anybody?

 

[Skeet]

Depends on the cocker really...minicockers have less volume, freeflow's have more than usual, which is why some people put those volumisers on, in place of the gas nut...hmm...guess you could try filling one with water and see what teh volume was...or maybe phone the tech guys at planet..im sure Jack knows.

Dont forget that, what you are after, isa bell curve, graph wise.
You can increase the input pressure to a certain point, where the input becomes harmonised with teh springing in teh valve..after that, velocity will drop off as teh excess pressure, will prematurely close the valve, leading to drop off/lower velocity.

Thats what sweetspotting is all about.

 

[fatmcgav]

Originally posted by Skeet
Depends on the cocker really...minicockers have less volume, freeflow's have more than usual, which is why some people put those volumisers on, in place of the gas nut...hmm...guess you could try filling one with water and see what teh volume was...or maybe phone the tech guys at planet..im sure Jack knows.

Dont forget that, what you are after, isa bell curve, graph wise.
You can increase the input pressure to a certain point, where the input becomes harmonised with teh springing in teh valve..after that, velocity will drop off as teh excess pressure, will prematurely close the valve, leading to drop off/lower velocity.

Thats what sweetspotting is all about.

Yeh, that's wat i've found with the results. I've just got to try n work the physics in to try and find out why it does that...
I was using a 2k3 Factory Eclipse - so yeh, spose i could give Planet a ring.

Anybody know the volume on a standard WGP body, or can give me a rough idea?

Cheers
Gavin

 

[Skeet]

What do you mean WHY it does that?
I told you why..surely it cant be hard to work the physics into it..not that im a physics expert.

Do you fully understand, how teh cocker works?

The force applied by the spring stack, behind teh hammer, isnt sufficient to fully open teh valve, or even a bit really, for all intents and purposes.

Its only once it starts moving, that teh velocity and teh mass of the cocking action (hammer, spring and cocking rod) gives sufficient force, to overcome the air pressure and spring, behind teh valve, for X amount of time.

So...i imagine you will need to know..teh full weight of the hammer, spring and cocking rod....its kinetic potential when cocked, velocity when released etc...

 

[JamesK]

i need to know roughly wat volume the air-chamber is - the section in front of the valve???

fill it with water and see how much water fits in there!
Might not be the best idea for your marker, but its a suggestion!

 

[fatmcgav]

Originally posted by Skeet
What do you mean WHY it does that?
I told you why..surely it cant be hard to work the physics into it..not that im a physics expert.

Do you fully understand, how teh cocker works?

The force applied by the spring stack, behind teh hammer, isnt sufficient to fully open teh valve, or even a bit really, for all intents and purposes.

Its only once it starts moving, that teh velocity and teh mass of the cocking action (hammer, spring and cocking rod) gives sufficient force, to overcome the air pressure and spring, behind teh valve, for X amount of time.

So...i imagine you will need to know..teh full weight of the hammer, spring and cocking rod....its kinetic potential when cocked, velocity when released etc...

Yeh, but i'm not considering the actual action of the firing, just how the pressure will affect the velocity.

So literally, all i need atm is the volume of the firing chamber - although i can see that your theory does make sound sense skeet, it's not rlly relevant atm
Cheers anyhow.

Anybody got any ideas?

Cheers
Gavin

 

[JamesK]

FILL IT WITH WATER! like I said above ^^^^^^^^^

 

[fatmcgav]

Originally posted by JamesK
fill it with water and see how much water fits in there!
Might not be the best idea for your marker, but its a suggestion!

lol, i wish i had the possiblity - unfortunately i went and sold the marker to a team mate a couple of weeks ago as i needed the money

Any volunteers