how to use Bike tubing instead of LRT

[-G-JiV-]

hm nice, that is how I built my Power Pack homemade^^ It holds about 8,3 litres of pressurized water^^ It is so awesome to make a water battle with this, haha. You just go ahead somebody, he uses a CPS 2500. ABout 4 seconds you are soaked with water but then you still keep going till you are 2 metres away and then you soak your opponent with 8,3 litres of water, that is more than 30 seconds firing with a 10 X(about 300 ml/s). YOur opponent thinks it will never end ahahaha, great! just great!

But now nobody fights against me while carring this big monster xD

[Killi101]

thats definitely encouraging^^ makes me want to build it more!!

[Fredcompany]

That looks awesome!

[Killi101]

Thanks, but once again i really need to know:
For my LRT
1: would an id of 1/2in be too big?
2: with this id would an od of 1in be too much
3: with these figures would 3in casing be too restrictive at full diameter expansion?
4: with the wall thickness at 1/4in how much pressure should i expect, if too low should i make the wall thickness bigger?
5: with about 8in of LRT at my specs what volume should i get(ofcourse not exact, just an idea of how much)

[Fredcompany]

an ID of 1/2in and OD of 1in seems about right.

LRT expands about 3x in (I think) circumference. That means the expanded outer circumference will be 25.132in and the inner circumference will be 12.566in.

That should be an outer diameter of 4 inches. putting the PC in 3in pipe will restrict the amount of water in the PC, but will make the LRT last longer. So 3in casing shouldn't be too restrictive. That said, if you can find 4in pipe for the PC case, you should probably use it for the longer shot time it will give you.

No idea about question 4, other than the second half. If the pressure is too low, make the walls thicker or just add some bike tubing. It's probably easier to just give it another dip in the liquid latex.

If you have 8in of LRT, that'll expand to 24in. The expanded inner diameter will be 12.566in, so the expanded inner area will be pi x (12.566)squared. That's 3.1415926 times 157.904, which is 496 cubic inches. That's roughly 8 liters per PC, minus the ends (it's not a perfect cylinder). So I'm guessing that's about 7.5l per PC.

7.5l per PC is 22.5l. That's 22.5kg you'll be carrying when it's full if my calculations are correct.

EDIT: Whoa that's a long mathsish post.

[-G-JiV-]

That sounds nice You will build up a SCH, filled from a hose, I think. 22 litres of water would be to much to pump...at an average pump volume of 40 ml
Do not forget, the bigger the Soaker the bigger the dead, unpressurized area^^

By the way I think a Soaker with 20 litres of pressurized water is a bit too much. My 8,3 litres are really really much, but it is enough, you do not need more, to my mind.
20 litres = 20 kilogramm+construction will weigh about 5 kilogramm, so you are carring 25 kilogramm around. In fact that is really much, you always have this wait when fully loaded, I do not think it is pleasant to wear this and you will need a break soon....
This will also result in slow in turning and running^^

By the way, please do not fall with this filled Homemade! The 20 kilogramm may destruc you

[Fredcompany]

I think one pressure chamber would probably do for this, but you might want to make it thicker than 1/2 inch for more pressure.

[Killi101]

wooh, im not sure its 7.5l per chamber...LRT expands 8.5 times width so 1/2 in becomes 4.35in this is D, D/2=r, r=2.125in 2.125X3.141...=6.675in squared 6.675X24=160.22in cubed that is 2625.535 ml, X3 (for total) is 7876.605ml or 7.876605l fred...i think you are wrong to be honest im not sure, maybe you are right but i do think its impossible for it to be that big. thanks for the advise! also im not going to fill it fully, the 8in was more of a safty feature i intend it to expand to 50cm length,not 60

[cantab]

the inner circumference will be 12.566in.

That should be an outer diameter of 4 inches
...

The expanded inner diameter will be 12.566in

This is where you messed up. Indeed as killi101 said

There is a much easier way to calculate the volume of water held. Calculate the volume of the PC case, and subtract from it the physical volume occupied by the rubber - which does not change much as it stretches. The remaining volume must be water when fully pumped.

The PC is 3.8 cm radius and 50 cm long, for a volume of 2.27 litres. The planned LRT dimensions are 20 cm long, 1/2 inch ID, 1 inch OD, for a volume of 76 ml. (This figure surprises me, but I THINK my maths is right. If the LRT occupies little space in general, subtracting it may be a needless step.) Therefore, the volume of water per case is 2.2 litres. Three cases gives 6.6 litres overall.

If weight is your concern, the density of rubber is very close to that of water, so just calculate the PC case volume and multiply by the density of water, then add in the weight of the plastic piping and fittings. (This last is hard to know before you actually have all the parts together).

[Killi101]

weight is nothing to me, one time i put a 5l bottle in my school bag and i hardly noticed it! so 6.6kg is fine for me, thanks

[Fredcompany]

Yeah I wasn't sure if LRT expanded 8x in width or circumference. I should have made sure first!
I was half-asleep

[Killi101]

Its ok, not really a problem. thing is i dont have much space...
belay that... im getting the parts tomorrow

Ok i got the copper parts today!:






Yep thats all so far, need another wrench, need the adapters need the hose tails and the hoseclamps. i scrapped the second ball valve on the backpack saved £6 so far ive spent £20 or $31.40 i also need a check valve and the Liquid rubber im ordering today and will come soon.keep watching! please note all the pipe shown is 22mm

[Killi101]

whatcha think?

EDIT:
do you guys think that this could be a good LRT case?
http://www.toolstation.com/shop/p29322

[zeda.beta]

Looks good, just make SURE that it doesn't explode. XD

[Killi101]

i dont think it will, the maximum expansion of the rubber should be close to this and i think it is ABS...not sure though. anyways the rubber should be here today and i should start to make the tubing soon. another thing, im making the tubing from 1/2in tubing, and the only barbs i can get are also 1/2in so would the LRT be able to hold? i was thinking maybe that i layer the barb with some rubber also, increasing friction but i dont really know