Search found 1053 matches

by hectmarr
Thu Oct 20, 2022 6:57 pm
Forum: General How-To & Discussion
Topic: Short question topic
Replies: 1502
Views: 537005

Re: Short question topic

It's not water, but if I pass a cotton ball through the inside of the barrel, it comes out quite wet. Putting some water in a sound suppressor to enhance the effect is a well-known trick for firearms, the fluid helps to cool the hot gasses and thus lowers the pressure. I would not be surprised if i...
by hectmarr
Thu Oct 13, 2022 11:30 am
Forum: General How-To & Discussion
Topic: Short question topic
Replies: 1502
Views: 537005

Re: Short question topic

What do you think... can it take a lot of speed out of a cup-type pellet, have moisture in the barrel at the time of the shot? It is a 24" .22 caliber barrel with 12 microrifling. It's not water, but if I pass a cotton ball through the inside of the barrel, it comes out quite wet. I have noticed var...
by hectmarr
Sun Oct 09, 2022 3:35 pm
Forum: Hybrid Cannons
Topic: Rapid Fire Hybrid System
Replies: 24
Views: 23174

Re: Rapid Fire Hybrid System

A video of test firing of this weapon, grayed out now. I'm shooting with 18g pellets attached to rupture discs, in this case two, for 9X. With three discs, the power is higher, but I have to increase the pressure to 10-11X because otherwise there are times when the disc does not break. Other than th...
by hectmarr
Tue Oct 04, 2022 1:51 pm
Forum: Hybrid Cannons
Topic: Single-pump handgun
Replies: 9
Views: 6981

Re: Single-pump handgun

Very good contribution the patent of this system. I couldn't find anything, myself, regarding this. Thank you very much for sharing I have a 3D printer but it's not mine, it's my friend's. He is doing the CAD drawings of this gun. I've been asked to build 5 or 6 guns just like this one by hobbyists ...
by hectmarr
Tue Oct 04, 2022 1:46 pm
Forum: Hybrid Cannons
Topic: Small semi automatic hybrid project
Replies: 129
Views: 82254

Re: Small semi automatic hybrid project

jackssmirkingrevenge wrote:
Tue Oct 04, 2022 10:24 am
Simply amazing to see this in action, excellent work as always!
YES, interesting weapon to play. Thank you!! :)
by hectmarr
Tue Oct 04, 2022 9:37 am
Forum: Off-Topic Hobbies
Topic: Low price HPA "sodastream" bottle
Replies: 3
Views: 4479

Re: Low price HPA "sodastream" bottle

That's cool but would it be better than something like this ? I was actually about to pick up a tank and pump for a future project. That bottle is much more expensive around here. A paintball canister costs about USD 242 against USD 23 for sodastream. The regulator has to be sold separately, it cos...
by hectmarr
Tue Oct 04, 2022 9:30 am
Forum: Off-Topic Hobbies
Topic: Low price HPA "sodastream" bottle
Replies: 3
Views: 4479

Re: Low price HPA "sodastream" bottle

That's cool but would it be better than something like this ? I was actually about to pick up a tank and pump for a future project. That bottle is much more expensive around here. A paintball canister costs about USD 242 against USD 23 for sodastream. The regulator has to be sold separately, it cos...
by hectmarr
Mon Oct 03, 2022 6:57 am
Forum: Off-Topic Hobbies
Topic: Low price HPA "sodastream" bottle
Replies: 3
Views: 4479

Low price HPA "sodastream" bottle

Testing this "sodastream" aluminum co2 canister as a low cost compressed air tank. 0.6 liter internal capacity, 250 bar factory test pressure, and 166 bar working pressure, lightweight. The regulator is for co2 from 0 to 7 bar, and supports about 150 bar at the input. Normally I inflate it to 120 ba...
by hectmarr
Thu Sep 29, 2022 6:01 pm
Forum: General How-To & Discussion
Topic: Short question topic
Replies: 1502
Views: 537005

Re: Short question topic

Same thing can happen easier with oxygen tanks, but I probably don't have to sit down and do the chemistry to see how much of a few grams of petroleum grease can do in a sealed oxygen rich environment, even if it is an HPA tank. :P No, numbers are not required. With the photos, for me, it is more t...
by hectmarr
Thu Sep 29, 2022 10:57 am
Forum: General How-To & Discussion
Topic: Short question topic
Replies: 1502
Views: 537005

Re: Short question topic

Looking at info on HPA canisters on the web, I came across this... Apparently I lubricate the threads of the carbon fiber paintball canister with petroleum-derived OIL and not silicone...terrible!
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by hectmarr
Fri Sep 23, 2022 4:15 pm
Forum: Hybrid Cannons
Topic: Small semi automatic hybrid project
Replies: 129
Views: 82254

Re: Small semi automatic hybrid project

I share a home video of the firing test of the "LB - VI" semi-automatic pellet launcher. :) The bb's gas loading drive works perfectly, with the appropriate modifications that I invented for it. It fires 6.35mm steel bb`s, and can hold 11 in the ammunition tube. The feed works by gravity, and has 5....
by hectmarr
Thu Sep 22, 2022 11:00 am
Forum: Hybrid Cannons
Topic: Single-pump handgun
Replies: 9
Views: 6981

Re: Single-pump handgun

An idea that can be used is embodied in a very low-power compressed air gun, which was very popular around here a few decades ago. To compress the spring, you have to rest the barrel of the gun against a hard surface, floor. The main advantage is that you can use almost your entire body weight to ge...
by hectmarr
Wed Sep 21, 2022 5:03 pm
Forum: Hybrid Cannons
Topic: Single-pump handgun
Replies: 9
Views: 6981

Re: Single-pump handgun

Very nicely done, I remember we had talked about this configuration here and you've implemented it beautifully as always :D I love the butane lighter incorporated into the grip for filling and from your video operation seems extremely smooth. The gun is set for approximately 50% compression comfort...
by hectmarr
Mon Sep 19, 2022 7:26 pm
Forum: Hybrid Cannons
Topic: Single-pump handgun
Replies: 9
Views: 6981

Re: Single-pump handgun

It is possible to increase the output energy by at least 30%, because it is not very hard to compress, (about 9 - 10 kg), but since the objective is to mark the objective, only that, I have decided that the energy does not exceed that, and not too hard to compress, I mean comfortable to operate. Tha...
by hectmarr
Mon Sep 19, 2022 4:10 pm
Forum: Hybrid Cannons
Topic: Single-pump handgun
Replies: 9
Views: 6981

Re: Single-pump handgun

Small video that shows the operation of this short weapon.