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revisiting the spud, anything radically new?

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revisiting the spud, anything radically new?

Unread postAuthor: zeigs spud » Fri May 25, 2012 2:19 am

Haven't been on in years but Ive been thinkin about my old cannon designs, anythings radically new since about 2008? I'm aware that there are finally piston hybrids now..


ah im missed this... :D
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Unread postAuthor: MrCrowley » Fri May 25, 2012 2:56 am

Think Fnord had made his piston hybrid around 07-08 to be fair :wink:

But this is pretty new...and big:
http://www.spudfiles.com/forums/vera-my ... 23989.html
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Unread postAuthor: jackssmirkingrevenge » Fri May 25, 2012 3:17 am

This too:

http://www.spudfiles.com/forums/lardas- ... 15524.html

everything else was pretty tame in comparison.

Oh, and I bought a lathe and mill and started making things like this: http://www.spudfiles.com/forums/lempo-p ... 23457.html
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Unread postAuthor: DYI » Sun May 27, 2012 3:40 pm

everything else was pretty tame in comparison.


While rather tiresome to reload, I wouldn't quite call this "tame"...

In more "conventional" areas, SB15 and MrCrowley have built spool-piston hybrids which are reliable, run up to 10X or so, can be constructed without machine tools, and can be reloaded almost as quickly as "advanced combustion" launchers.

Pneumatics have grown a great deal as well, but I don't really keep up with that side of things to the same extent. I would say that the typical build style has "matured" somewhat in the past years, although in most cases it has not grown by leaps and bounds.

In fact, quite a few of us have got machine tools now. I currently have a lathe but no mill, and am working on ET and ETC (and by this I mean Al + H<sub>2</sub>O and reactions like it, not explosive propellants) propulsion, as well as on a foray back into hybrids to take a closer look at optimal propellant mixes.
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Unread postAuthor: Bowman » Sun May 27, 2012 5:34 pm

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Unread postAuthor: sharpshooter11000 » Sun May 27, 2012 5:49 pm

Well noobs can now build QEV cannons! :lol:
Cough-me-cough!

Seriously though- on the pneumatic scene not much has really happened as far as new ideas, at least in the year I've been here. And as others have said, piston hybrids, VERA, etc.
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Unread postAuthor: Fnord » Mon May 28, 2012 11:14 am

Think Fnord had made his piston hybrid around 07-08 to be fair


Galfisk had one before me, though did not post it until quite some time later.
Technically the first hybrid was a diaphragm valved gun by DR.

It seems we have a trend toward smaller, more energy-dense launchers recently, both in conventional guns and experimental ones. I'd read up on topics posted by DYI and JSR; there's some interesting stuff out there.
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Unread postAuthor: D_Hall » Mon May 28, 2012 3:32 pm

Fnord wrote:It seems we have a trend toward smaller, more energy-dense launchers recently, both in conventional guns and experimental ones.

At the risk of sounding like an arse.... I think I pretty much went as far as anyone can reasonably go with the "larger, less energy dense" route.
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Unread postAuthor: Fnord » Mon May 28, 2012 4:14 pm

^^Build a trebuchet that can match vera's muzzle energy and then we'll talk. :P

But yes, you are definitely the out-lier in the dataset, and if we were averaging the forum trends by gun mass you'd probably offset the results noticeably.
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Unread postAuthor: zeigs spud » Tue May 29, 2012 4:24 pm

wow guys, i'm soooo impressed! Thats really cool that things shifted to smaller though, didnt see that comin.

P.S. i estimated the 2008, i couldnt remember when i left.
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Unread postAuthor: D_Hall » Tue May 29, 2012 7:14 pm

Fnord wrote:^^Build a trebuchet that can match vera's muzzle energy and then we'll talk. :P

But yes, you are definitely the out-lier in the dataset, and if we were averaging the forum trends by gun mass you'd probably offset the results noticeably.


LOL. Almost certainly true. VERA probably represents (by mass), the majority of all guns built by members of this forum over the past five years. I mean, 28,000 pounds represents a LOT of PVC! :D
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Unread postAuthor: jackssmirkingrevenge » Wed May 30, 2012 12:08 am

D_Hall wrote:VERA probably represents (by mass), the majority of all guns built by members of this forum over the past five years.


They would probably all fit in the barrel! That would be a very interesting buckshot round :D
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Unread postAuthor: CpTn_lAw » Wed May 30, 2012 7:35 am

Lol :D

And VERA is by far the most impressive stuff i've seen here, along with DYI's electrothermal gun (the impact flash is... :twisted: )
You should check out Petitlu's Hybrid -ThorJack . Extremely good work aswell.
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Unread postAuthor: rna_duelers » Thu Jun 07, 2012 1:15 am

So with all this machining gear about has someone taken steps to rifle regular PVC pipes with reasonable tolerences and repeatablilty that doesn't cost an arm and a leg?

15,000 posts....A few to read!
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