Thanks for the explanation. Now I get it. Like you said, the o-ring isn't supported from the outside, so it stretches and just comes off the rod when you shoot it. I agree that a harder o-ring is the best experiment to try next. If all else fails, you can try to modify the valve with a sealing face ...

hectmarr wrote: ↑

Thu Aug 19, 2021 6:47 pm

It is not a very neat job, but it works fast and it pays quite little, it is what it is.

Almost like a T-34 tank

It's good that you have this resource to better flesh out your ideas!

We were using two different Clippard valves that were both rated to 300psi and one could handle 800psi but the other would damage the seat at those pressures and leak after being damaged. We are using both Humphrey valves and our own custom valves for the trigger now up to 1200psi for the custom. Th...

You can use X-shaped o-rings to reduce friction. I use them on my piston with standard o-ring compression and I can easily move the piston by pushing it with one finger.

I just finished making the v3 based on hectmarr's design. This is the final arrangement: Regulator nacrt-Model01-00.png The body is 2011 Aluminum, just so it would be easier to machine. Both ports are threaded for G1/8 RegV3AlCuBiPb.jpg Piston is 5,8mm steel rod with 3x1,5mm (6mm OD) O rings RegV3As...

That is really clean and very nice. I love that it's a hybrid. So awesome. Nice job!

Sick! Looks very well put together. Inspiring actually!

Very clean work, nice "proper" evolution after all that prototyping...

I like the markings too, although perhaps it's more of a Fuerza Aerea (+Butanea) Argentina sort of equipment

Very interesting (and creative use of Tippex!) and good that you made it work!

I had done some experiments with lead projectiles sealed in a breech when playing with hybrid cartridges, metal on metal there were no leaks and it worked to about 8x if I recall correctly.

An example of the Crosman "Rocket Spear Sea Gun" came up for sale locally, were it a different economic climate I would have contemplated purchasing it but alas, these are difficult times and choices must be made :roll: It did however persuade me to do some more digging and I found the patent . http...

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...

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...

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...

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...

A while ago I came up with a design that used an electric motor to cock a hammer valve that basically consisted of the barrel itself. looking at it, it would probably work just as well without the motor, though you'd need to add a latch that would hold the barrel in the cocked position. It's fairly ...