Very clean work, i hope you'lle make a good shock absorber behind the piston, so you 'll shoot at more acceptable pressions :p

Wait for vids !!

You've not a support to shoot confortably, you could ad 90° part to handle easlier your cannon

Sorry, i've some difficulties to find the right words..

To increase the pilot volume speed exhaust i guess

The faster it exhausts, the more powerful it is

Sorry if i said it wrong.. ^^

Looks like mine, mine has a 1.5 QEV instead.

here is some pictures and vids but the topic is not updated, now i shoot at 25bar and use a plastic piston, lighter:
http://patator.frbb.net/t8285p210-fonctionnel-mmk-2-pac-jusqu-a-40-bar-qev-1-1-2?highlight=jusqu+%E0

I use a 1300*26mm barrel.

Very ...

I designed a system wich need a weaker spring and keep a good acceleration.

The inbalance can be more or less large, depending on weither the spring strenght.

It can be optimised easily.

I'm not sur if i understand or not.

There is only a spring that prevent the translation of the piston, by keeping the sealing of the neopren part ?

The spring should be very strong in order to support the initial pressure, but not too much, the piston should be able to recoil easily.


Right ? ^^

Yes, with a good bumper, but after many shoots.. i don't know...

The diameter is large, so the forces are very "strong", with a pneumatical bumper you will certainly no have problem, but there aren't many materials wich could be a good bumper durably.

But if you have experience with that, he would ...

I don't now what what will you use it for, but the threaded rob looks too thin compared the seat diameter.

I guess this piston will recoil, end shock in the tee or i don't now.

I made a qdv with a 6mm threaded rod and 16mm seat diameter, after some shoots, the rob is completely twisted, and steel ...

Hi, i post my drawings :

I draw since about ten years, but now i haven't much time to draw, only portraits which ask me to draw, or when i've one hour and the motivation in the same time ^^

with model, for a friend
http://i42.servimg.com/u/f42/14/32/24/49/dessin10.jpg

with model for family ...

Mais il sera bien moins efficace, ce qui comte c'est la quantité d'air qui entre dans le silencieux avant que le projo sorte complètement du canon+silencieux.
Dans cette config' le projo sortira trop tôt, l'air n'aura pas le temps de passer par les trous du silencieux et va préférer passer par la ...

JSR use lot of epoxy, but for your case it may be to brittle for the pressure you use.

To have a efficient silencer, in theory, the lenghts of the barrel and the silencer are the same. But you could have any reduction of noise with smaller silencer i think.

And with it, you have to make a bipod ...

We are several to notice that, but his don't see anything ^^

I think the chamber is enormous compared to barrel, and 120 inclue much air, it's longer to leave barrel.

In france to

We can see some snakes near a lakes, ponds, some vipers, and others, but i don't remeber and can't find english equivalent. They like wet areas.

Yet we have a relavely cold climate, but there are sone big snakes like "python" in french in southern

Here, technician made a "soudo-brasage" with brass or a brazing ?
(how to say "soudo-brasage"?)

I don't see very well, but seems that's braze with brass rods, you must have bi-gaz post weld, to up to 1200-1500°.

If it's only a hard braze, you can use propane blowtorch, but to braze steel and large diameters, oxy-acetaline or propane is imperative.

Google translate don't make the different ...

Hi

On the first videos, the small flow induce a bgf mess of air, it should have a 10 meters barrel to exploit all HP air.

But with 2inch QDV ... a monster !