Air Chamber volume on a Cocker
- Thread starter fatmcgav
- Start date
cant beat some of the old science
http://www.weebls-stuff.com/toons/science/
I do aeronautical engineering at glasgow so am always trying to draw parallels with paintballin and phyics, aerodynamics etc etc.
Like everyones said..fill it with water...or take a random guess.
You could calculate how much air is used roughly in the firing chamber by the average shot per 4500 1.1 tank people get.
http://www.weebls-stuff.com/toons/science/
I do aeronautical engineering at glasgow so am always trying to draw parallels with paintballin and phyics, aerodynamics etc etc.
Like everyones said..fill it with water...or take a random guess.
You could calculate how much air is used roughly in the firing chamber by the average shot per 4500 1.1 tank people get.
Hmm...1.1L is 1100 cubic centimeters....hmm...so...say 1200 shots...0.9167 cubic centimeters Volume?
Sounds a bit small to be honest...ahh...hang on...thats just teh size of teh bottle...but its compressed...how many litres of air does it actually hold?
looking at the diagram....teh bottom tube is about .7 of an inch...and the air chamber is about an inch long...so...pi R squared H....hmmm 17.78mm diameter...thats ummm....8.89mm radius...erm..pi at 3.14...gives 248.161mm cubed, divided by 100 to give cubic centimeter of 2.48161 rounded.
Sounds a bit small to be honest...ahh...hang on...thats just teh size of teh bottle...but its compressed...how many litres of air does it actually hold?
looking at the diagram....teh bottom tube is about .7 of an inch...and the air chamber is about an inch long...so...pi R squared H....hmmm 17.78mm diameter...thats ummm....8.89mm radius...erm..pi at 3.14...gives 248.161mm cubed, divided by 100 to give cubic centimeter of 2.48161 rounded.
that makes more sense....
Am knee deep in fluid mechanics the now. Cant be bothered too much with thermodynamics.
i hate uni
Am knee deep in fluid mechanics the now. Cant be bothered too much with thermodynamics.
i hate uni
Just something to think about:
As long as the air chamber is above a certain size the volume becomes nearly irrelevent.
A much bigger factor is the flow rate though the valve. (IE how fast the air can enter and leave the chamber).
Attempting to model this system as a given volume of air at a given pressure propelling the ball is very far away from what actually happens because the volumiser will not empty completely, not even close.
As soon as the pressure in the volume chamber drops the regulator starts filling the volumiser back up.
The difference between the input and output flow rates gives the rate at which the chamber empties.
If you could measure these (or even approximate them) it would be intersting to calculate the minimum cycle time for the firing pressure to recharge.
As long as the air chamber is above a certain size the volume becomes nearly irrelevent.
A much bigger factor is the flow rate though the valve. (IE how fast the air can enter and leave the chamber).
Attempting to model this system as a given volume of air at a given pressure propelling the ball is very far away from what actually happens because the volumiser will not empty completely, not even close.
As soon as the pressure in the volume chamber drops the regulator starts filling the volumiser back up.
The difference between the input and output flow rates gives the rate at which the chamber empties.
If you could measure these (or even approximate them) it would be intersting to calculate the minimum cycle time for the firing pressure to recharge.
See...now thats what I had thought really...I couldnt see why the air chamber, would have anything to do with how, input relates to velocity...its as you say...only to do with, getting teh aor in, and out and how the valve reacts to the increase or decrease in input pressure..I would say it has more to do with the valve, valve springing and the point of equilibrium, between one side of teh valve and the force applied by the hammer...which is, what I tried to get at in teh first place...
Yep, i can see where ure comin from guys, and it does make perfect sense.
But for simplicites sake, as this is only meant to be an A2 project, and i'm already using Degree Level Physics, i'll stick with wat i got for now.
If i ever get bored, and feel like some decent physics, then i think i'll give this a go
Cheers for all the help though.
I'm sure it's intersted u guys as much as me.
Cheers
Fatmcgav
But for simplicites sake, as this is only meant to be an A2 project, and i'm already using Degree Level Physics, i'll stick with wat i got for now.
If i ever get bored, and feel like some decent physics, then i think i'll give this a go
Cheers for all the help though.
I'm sure it's intersted u guys as much as me.
Cheers
Fatmcgav
I hate Physics anyway...I mean...too much of Physics, is bollox..."if we lived in a perfect vacume, with a sun 3 times closer on tuesdays and you stood ona slope of 32 degrees and farted...it would it solidify and fall down our trouser legs"...well..we dont, so who cares? Kinda thing!