Very interesting work!

I love the "spade grip", reminds me of a friend's post-apocalyptic (airsoft!) RPK:

Du très beau travail réalisé avec des matériaux "over the counter" et sans outils spécialisés, very good job!

I bet you could up the pressure even more but even as it is you're getting very respectable power and shot count.

I remember proposing this sort of test a long time ago :D That was very fun to watch, I'm amazed by how much pressure it took to actually burst a lot of the PVC, although that of course is no endorsement to exceed the working pressures recommended by the manufacturers. It also makes the point that e...

Moonbogg wrote: ↑

Mon Jul 25, 2022 9:44 pm

I will either leave to my kids or force the kids to bury me with the cannons, not sure which yet.

The latter would be an interesting discovery for future archeologists in the former case they could be used to distribute your ashes

Take a look at this thread, plenty of examples on the same concept.

wyz2285 wrote: ↑

Wed Jul 13, 2022 3:19 pm

it's good to see the forum is still alive and you're still here Jack!

Well, sort-of and glad to see you're still around too!

If you keep pulling the air pistol trigger does the blow forward valve in the syringe stays open? If so I think by restricting the blowgun airflow you could make it fire fully automatic. Yes, I had hoped it would work in full auto ( here is a development thread) but I could never get it to cycle pr...

I definitely have a weakness for old and unusual airguns :) I like the idea because it comes out of the conceptual "box" and is repeated all the time. There is always a different way to do the same with its pros and cons for sure. I was unaware of this design when I posted almost the same idea 15 ye...

I think I will do what I wanted to do with the first one (but hesitated because it's a bit of an antique) and give it a bit of an upgrade. Interesting that the current version being sold has gone back to the removable bolt and two fixed power settings, albeit with a rear cocking bolt and a trigger g...

I have obtained a second example of these curious devices, of more recent manufacture with a number of refinements compared to the older original. Here they are side by side, with the newer version below the original one: https://i.imgur.com/UuNsjfv.jpg The most obvious refinement is a cutout in the...

Herewith my addition to the unusual vintage airgun stable, the Benjamin 30/30. This particular example was purchased as "unrepairable" but is in quite fine condition and appears to be complete: http://i.imgur.com/K2Y10mYh.jpg Internal diagram showing the unconventional mechanism. The barrel assembly...

The solution is to meter your fuel, there are several ways you can go about this.

I personally prefer syringe injection but it depends on the size of the cannon, above a certain chamber volume you won't find a syringe big enough.

One is generally well advised not to mess with oxygen. If you do, PVC construction is not a good idea, as the potential pressure generated increases proportionally to the amount of oxygen available. Consider using a syringe to meter your fuel for good and consistent performance, rather than guesswor...

Still here but with much less activity, the question has been asked as to whether spudding is dead, and in the Anglosphere at least there definitely seems to be a lot less interest especially from the younger individuals that fuel this hobby.

That's true, although for most of the setups we see on spudfiles a slow leak would not be sufficient to pilot the valve, as it's rare that the the piston or diaphragm is a perfect seal, especially without the shock of a sudden pressure imbalance.