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QDV housing construction method

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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Unread postAuthor: shardbearer » Mon May 09, 2011 5:28 pm

I just thought of this, it sticks better to the original QDV design:

Take 2 bushings (1 inch x 3 inch maybe?), and sand out the ridges. Over the bushings, put 3 inch couplers, then PVC pipe between them. Put the pipe which holds the piston straight through both bushings, then solvent weld her up. Voila!
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Unread postAuthor: Technician1002 » Mon May 09, 2011 6:49 pm

That is the way my ABS cannon is built. 2 inch barrel in 4 X 2 inch bushings in 4 inch couplers with 4 inch pipe in between. Ridge is sanded out on the bushings so the 2 inch pipe goes through them. :)

I assembled my cannon from the breech and moved forward. The rear bushing was installed on the pipe, a coupler added, then the chamber pipe. A 2nd 4 inch coupler was added and last the muzzle end bushing. This last bushing is the one that is not pushed all the way in as it became stuck in assembly.

This photo is the breech end showing the barrel, rear bushing, and rear coupling just prior to adding the 4 inch chamber.
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Last edited by Technician1002 on Tue May 10, 2011 12:11 am, edited 1 time in total.
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Unread postAuthor: shardbearer » Mon May 09, 2011 9:25 pm

Doh. :oops: Should have remembered that one.

Has anyone made a QDV in a tee? I think that might be my first pneumatic gun.
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Unread postAuthor: jackssmirkingrevenge » Mon May 09, 2011 11:59 pm

shardbearer wrote:Has anyone made a QDV in a tee? I think that might be my first pneumatic gun.


Yes.
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Unread postAuthor: shardbearer » Tue May 10, 2011 1:46 am

I meant with the chamber attached to the bottom of the tee like an over under.
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Unread postAuthor: qwerty » Tue May 10, 2011 1:51 am

Biopyro has made one but i think he only posted it on UKSGC which has been closed down finally...
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Unread postAuthor: jackssmirkingrevenge » Tue May 10, 2011 6:13 am

shardbearer wrote:I meant with the chamber attached to the bottom of the tee like an over under.


That should work just as well.
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Unread postAuthor: Gun Freak » Sat May 14, 2011 3:18 pm

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Unread postAuthor: shardbearer » Sat May 14, 2011 8:00 pm

Not a true QDV because the piston cannot move on the rod.

A nice cannon, but it doesnt help me much cause that is small diameter brass/copper (I cant tell which) tee, and I am thinking of basing mine around a 2" PVC tee.
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Unread postAuthor: Gun Freak » Thu May 19, 2011 9:17 pm

shardbearer wrote:Not a true QDV because the piston cannot move on the rod.

Who says a QDV's piston has to be able to slide freely?

A nice cannon, but it doesnt help me much cause that is small diameter brass/copper (I cant tell which) tee, and I am thinking of basing mine around a 2" PVC tee.

So scale it up in plastic, lol. I gave you the link to give you an idea, not a blueprint to copy off of.
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