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Safety of malleable iron

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Unread postAuthor: frankrede » Sun Jun 22, 2008 5:08 pm

spudfarm wrote:i think all the "magic dust" talk should be stopped here before someone get a nice slap by a mod.

frank: cell core is just fine for everything. if you don't put more pressure in it than 5psi.

one more note about this. you know these balls? i bursted one and it held up to 65psi.
Excuse me?
Spudfarm, I suggest you rethink your words, you obviously don't know who I am.
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Unread postAuthor: SpudFarm » Sun Jun 22, 2008 5:21 pm

what?

powder is not allowed

cell core is fine on 5psi since you can blow harder than that

the ball took 65psi
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Unread postAuthor: Maniac » Sun Jun 22, 2008 5:36 pm

Spudfarm you must have been using a cheaper brand,my dad takes his up to a around 30, and uses his on a regular basis, the only reason he ever throws one out is because of regular wear and tear. and leakage around the filling inlet.
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Unread postAuthor: SpudFarm » Sun Jun 22, 2008 6:57 pm

there people go.. even thin rubber balls can take 30psi with a man on it.

(maybe the calculation i did was right)
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Unread postAuthor: joestue » Sun Jun 22, 2008 8:00 pm

65 psi is, well, insane.

6.5 psi is a more reasonable burst.

even with someone sitting on it, and a one foot diameter circle is touching the ground, which i would imagine is reasonable, yields 113 square inches.

at most 2 psi people, unless your grandma is sitting on it...

edit: 30-65 kilo pascals makes sense, at 4.3 to 9.4 psi
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Unread postAuthor: frankrede » Mon Jun 23, 2008 7:59 am

spudfarm wrote:what?

powder is not allowed

cell core is fine on 5psi since you can blow harder than that

the ball took 65psi
I was saying, don't talk down to me as if I didn't know my stuff.
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Unread postAuthor: SpudFarm » Mon Jun 23, 2008 11:14 am

i did not.. i just said the truth.. and it was not to tell you anything, it was like just a joke since everyone know cell core is fine on 5psi.
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Unread postAuthor: frankrede » Mon Jun 23, 2008 5:53 pm

spudfarm wrote:i did not.. i just said the truth.. and it was not to tell you anything, it was like just a joke since everyone know cell core is fine on 5psi.
nonetheless, Cell core abs is fine at 6 psi;)
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Unread postAuthor: SpudFarm » Mon Jun 23, 2008 5:59 pm

:lol:
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Unread postAuthor: tyrant_bb » Tue Jun 24, 2008 11:35 pm

One more question, is iron pipe as strong as steel? I'm not talking about the malleable iron fittings, I'm just talking about the black iron nipples that I see in the hardware stores.

I'm not really worried that it would fail if its stronger than malleable... but I'm just wondering.
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Unread postAuthor: frankrede » Wed Jun 25, 2008 12:13 am

I believe that it is steel....
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Unread postAuthor: cdheller » Wed Jun 25, 2008 7:33 am

SpudFarm wrote:i can't have done that right..


52000 for material strength looks pretty high.
30-35000 is the range of steel pipe ,,I don't know the numbers for iron.

Standard practice is cutting your final strength in halve on threaded pipe with other measurements the same.
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Unread postAuthor: SpudFarm » Wed Jun 25, 2008 11:20 am

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