I am planning on using the power of hybrid cannons as a project for my thermodynamics class and pretend to be doing a lot of tests on it. Always the best excuse :) I think you can go a lot simpler by just using a burst disk and fuel by volume (with a syringe) instead of by pressure. Example of a bu...

An old prototype I found digging through some archives.

A motor driven rotor pushes on a stiff steel rod that then whacks a hammer valve. In the test airsoft BBs were being gravity fed into a tee breech.

The valve is opened 6 times per revolution.

Nice electromechanical prototype. I did something similar, is what I showed, (thinking of feeding the automatic hybrid), with an advantage and a disadvantage. The advantage is that it is simpler, and the disadvantage is that I cannot exceed 9 or 10 bar, which is the maximum that the solenoid valve ...

So tels me what is the rôle of rifling in the brenneke rounds ? It is for stability or something ? In the past most shotguns had fixed chokes at the end of the barrel. Trying to fire a full diameter slug through a choked barrel means it will probably get stuck in the muzzle and blow the barrel. The...

A little teaser of what I've been playing with this past week, more details to follow over the next few days

Just playing with an antique

Very interesting! I would be worried about the BBs damaging each other in the magazine though, did you verify that they are intact after a few shots?

Or should I look into using epoxy or a solid rubber one? But that would require me to make an entirely new piston. The epoxy I have right now is kinda thick so to make a piston it probably needs to be thinned down. Thanks for the help. I've had success with a rubber piston even at 850 psi. Easy to ...

Here's something a little unusual that I acquired a while back, it took me some time to play with it as I needed to make an adapter for a new chamber and it's only recently that I was able to cut non-standard threads on the lathe. I bought this one without any accessories and with an air reservoir t...

Beautiful stick that shoots! It amazes me that it is from the mid-19th century, and it still works, with the repairs and adaptation that you did. It is a pcp from 1860! When you look at it you can see the similarity to a percussion lock , it really is quite fascinating and an interesting bit of his...

Sorry to go to the sewers, and divert the topic of the publication a bit. ;) No need to apologize, I'm here for the humor as much as I am for the ballistics ;) How finely have you tried adjusting the distance between the barrel and valve body? The problem struck me while looking at the photos, if y...

Nice idea, you could easily make something like the Villar Perosa



The magazine style would fit too!

So when do we get to see the unbalanced spool valve that opens with the anemic 19th century hammer at 3 kPSI? I see you have mastered clairvoyance :D Seriously I can easily replace the CO2 bottle with a 3000 psi tank and making a balanced valve would not be that much of a challenge... I'm just worr...

hectmarr wrote: ↑

Fri Feb 26, 2021 9:41 am

I think I would like to have something like that, to play with.

As long as you do it safely

I gave the balanced valve a go and was able to raise firing pressure to 1100 psi. Some initial testing: https://youtu.be/FnSsZp7-18M Best velocity recorded was 774 fps for 59.3 ft lbs, around 50% more than the maximum for the conventional valve. I was a little conservative with the diameter of the b...