SpudFiles

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...

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

But this is pretty new...and big:
http://www.spudfiles.com/forums/vera-my ... 23989.html

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

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 + H₂O 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.

What about this?

http://www.spudfiles.com/forums/gatling-1-t20903.html

or this?

http://www.spudfiles.com/forums/tbma-23 ... 23605.html

Well noobs can now build QEV cannons!
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.

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.

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.

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

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.

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.

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

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_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

Lol

And VERA is by far the most impressive stuff i've seen here, along with DYI's electrothermal gun (the impact flash is... )
You should check out Petitlu's Hybrid -ThorJack . Extremely good work aswell.

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!