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Male Endcap instead of a female one?

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Male Endcap instead of a female one?

Unread postAuthor: VirusX » Mon Mar 08, 2010 12:47 pm

Hey,

In the Combustion showcase, everyone uses female endcaps on their chamber, but here in Germany are only 2" female endcaps available. My chamber gets at least 3" big, so I have to use some more fittings and each one costs 20€. :shock:

Could I use a 3" male endcap for my combustion, too? It's pressure rated up to 10 bar (145psi), but male endcaps are not as safe as female caps, right?
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Unread postAuthor: eriko1337 » Mon Mar 08, 2010 1:00 pm

i think it will be okay if you epoxy the end cap there, combustions dont get as high pressure as a pneumatic inside the chamber, but im not a combustion pro xD. myself i would try it out
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Unread postAuthor: VirusX » Mon Mar 08, 2010 1:03 pm

No, the male endcap should still be removable ;)
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Unread postAuthor: eriko1337 » Mon Mar 08, 2010 1:04 pm

oh yeah sorry for that didnt think of it mate :P
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Unread postAuthor: jrrdw » Mon Mar 08, 2010 2:12 pm

Sounds to me like your refering to a clean out cap...
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Unread postAuthor: McCoytheGreater » Mon Mar 08, 2010 2:14 pm

You should be fine with the male endcap. Just make sure all your fittings are cemented well enough and you'll be OK.
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Re: Male Endcap instead of a female one?

Unread postAuthor: DR » Tue Mar 09, 2010 12:47 am

VirusX wrote:Hey,

In the Combustion showcase, everyone uses female endcaps on their chamber, but here in Germany are only 2" female endcaps available. My chamber gets at least 3" big, so I have to use some more fittings and each one costs 20€. :shock:

Could I use a 3" male endcap for my combustion, too? It's pressure rated up to 10 bar (145psi), but male endcaps are not as safe as female caps, right?


When you stated male "end caps", I'm assuming that you also mean "male adapter".

The male "end cap" is (by far) much stronger, than the female. (The female is commonly referred to as a "Cleanout".

The male adapter also requires a female-threaded cap, which is often-times, the most expensive of all.

Good Luck, with finding what you need.
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Re: Male Endcap instead of a female one?

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Unread postAuthor: VirusX » Tue Mar 09, 2010 7:46 am

Okay I don't know the technical term, so here is what I mean:

http://www.kwerk.de/pdf_dateien/cfv.pdf And I may use this one instead of a female one ;)
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Unread postAuthor: DR » Tue Mar 09, 2010 11:46 am

VirusX wrote:Okay I don't know the technical term, so here is what I mean:

http://www.kwerk.de/pdf_dateien/cfv.pdf And I may use this one instead of a female one ;)


Yes, I knew what you meant- And this is what you would put that cap on:

<a href="http://www.usplastic.com/catalog/images/products/pipe/28361p.jpg">PVC Male Adaptor Thread x Socket</a>
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Unread postAuthor: VirusX » Tue Mar 09, 2010 4:30 pm

Pff I selected all parts - and only the pvc pipes and fittings cost more than 100€. Metering system, ignition and all the little things not calculated. That's a lot of money.

(I thought with max. 100€ for everything, not just for the pipes)
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Unread postAuthor: DR » Tue Mar 09, 2010 6:48 pm

Buy 5 feet (60") of 1-1/2" pipe, along with a male reducer and cap.

25" Chamber portion + 35" Barrel portion = 60" = 0.71:1 C:B ratio

Add two screws, (180 degress apart) in the chamber portion, 8" from the forward end of the male reducer.

Attach a BBQ ignitor.

Bingo! - Bare-bones potato cannon.
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Unread postAuthor: mikespahn » Sun Apr 18, 2010 11:41 am

as far as i know, cleanout caps are not pressure rated. a male end adapter and female cap (threads on the outside of the chamber and inside of end cap) is much stronger.
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