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is malleable iron safe

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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is malleable iron safe

Unread postAuthor: bigbob12345 » Wed Dec 12, 2007 9:30 am

I just have easy acsess to malleable iron and in lots of sizes and I want to make a hybrid out of it and I would like it to be safer than useing sch80 pvc but is it
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Unread postAuthor: Fnord » Wed Dec 12, 2007 9:46 am

Yes, it will be fine. Didn't you just post a topic like this?
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Unread postAuthor: ALIHISGREAT » Wed Dec 12, 2007 9:48 am

yes it is almost certainly safer then pvc, i posted a few day ago about some malleable iron fittings.

http://www.spudfiles.com/forums/malleable-iron-fittings-t12037.html
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Unread postAuthor: bigbob12345 » Wed Dec 12, 2007 9:49 am

No that topic was for sch40 steel not malleable iron.
And Im very glad to hear its safe I will be starting my hybrid when summer comes along :D
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Unread postAuthor: ALIHISGREAT » Wed Dec 12, 2007 9:53 am

bigbob12345 wrote:No that topic was for sch40 steel not malleable iron.
And Im very glad to hear its safe I will be starting my hybrid when summer comes along :D


why wait till the summer? i would get going so that i could take my time and think it over properly.
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Unread postAuthor: bigbob12345 » Wed Dec 12, 2007 10:07 am

Because by then I would of save up some money and because my dad says I can make one when Im 15 which is at the start of summer
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Unread postAuthor: ALIHISGREAT » Wed Dec 12, 2007 10:11 am

bigbob12345 wrote:Because by then I would of save up some money and because my dad says I can make one when Im 15 which is at the start of summer


ahh cool i'm 15 i was on the 3rd december :) and i also have to save up for all my cannons but it gives me time to perfect the design :)
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Unread postAuthor: grumpy » Wed Dec 12, 2007 11:23 am

here is a link that should help you since you are obviously tryng to learn about pipe pressures and different pipes.
http://www.engineeringtoolbox.com/pipes ... -t_40.html
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Unread postAuthor: bigbob12345 » Wed Dec 12, 2007 11:48 am

Thanks so much for the link grumpy that will help so much with the hybrid :D
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Unread postAuthor: SpudBlaster15 » Wed Dec 12, 2007 6:32 pm

The burst pressure of the largest diameter, worst grade steel/iron fittings you would be able to find in a hardware store is around 2000psi. So long as DDT does not occur, you will be fine.
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Unread postAuthor: bigbob12345 » Wed Dec 12, 2007 6:48 pm

What is DDT?Ive always wondered that. Ive checked the spud wiki and it just doesnt make sense to me.And 2000psi minimum burst pressure thats wonderful :D :D :D
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Unread postAuthor: MrCrowley » Wed Dec 12, 2007 6:57 pm

Deflagration to Detonation Transition.

Bad if your a average spudder, good if you have one helluva strong chamber and want to break the sound barrier.

More or less the shockwave from the flame front travelling faster then the speed of sound is too strong for the pipe to handle and it fails.... I think. :?
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Unread postAuthor: bigbob12345 » Wed Dec 12, 2007 7:07 pm

I think I get it :idea:
But how can I avoid this from happening
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Unread postAuthor: MrCrowley » Wed Dec 12, 2007 7:20 pm

On the other hand, after a small spark has created a deflagration, the transition process can take several meters or longer and a corresponding large amount of time. The key to detonation initiation schemes applicable topulse detonation engines is to significantly shorten the distance and time required for deflagration-to-deto-nation transition.

Deflagration-to-detonation transition is the general process by which a subsonic combustion wave(deflagration or flame) becomes a supersonic combustion wave (detonation


So I guess that means, don't have too long of a chamber (like a few meters long.)

Try reading <A HREF="http://209.85.173.104/search?q=cache:ZlgVykp4Q_4J:www.galcit.caltech.edu/EDL/publications/reprints/jannaf99_paper.pdf+Deflagration+to+Detonation+Transition&hl=en&ct=clnk&cd=1&gl=nz">This</a>

I'm not the best person to talk to about this, I more or less have picked it up from reading other posts, you need someone like BoilingLeadBath, DIY or SpudBlaster15
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Unread postAuthor: bigbob12345 » Wed Dec 12, 2007 7:26 pm

Do you seriouslyexpect me to read all that. I started it and then noticed how long it is
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