Search found 943 matches

by hectmarr
Fri May 07, 2021 2:23 pm
Forum: Hybrid Cannons
Topic: Xtreme-patator
Replies: 11
Views: 746

Re: Xtreme-patator

wow is supersonic!! :o I imagine some of your creations also exceed the speed of sound ;) even though your projects focus mostly on function and not maximum performance. It is possible although I don't really know. I have shot 6mm bb of 0.23gr plastic, with my hybrid gun at 7X, and I think it is mo...
by hectmarr
Fri May 07, 2021 10:27 am
Forum: Hybrid Cannons
Topic: Xtreme-patator
Replies: 11
Views: 746

Re: Xtreme-patator

jackssmirkingrevenge wrote:
Fri May 07, 2021 10:14 am
Voila with a 1 meter barrel:

Image

50cm barrel gives 319 m/s and 43J, 66cm gives 356 m/s and 53J
wow is supersonic!! :o
by hectmarr
Thu May 06, 2021 5:40 pm
Forum: General How-To & Discussion
Topic: Short question topic
Replies: 1492
Views: 154616

Re: Short question topic

I already understand it. "K" is for multiplying by 1,000.
In this specific case, 1.8K means 1.8 psi x 1000, it is 1800 psi, about 124 bar. Thanks for your answer.
by hectmarr
Thu May 06, 2021 4:49 pm
Forum: General How-To & Discussion
Topic: Short question topic
Replies: 1492
Views: 154616

Re: Short question topic

A safety valve for pneumatic installation that says 1.8K, how many bar or psi is it? It is a rupture disc of a pressure regulator and I do not understand when it is 1.8K ...
by hectmarr
Mon May 03, 2021 6:18 pm
Forum: General How-To & Discussion
Topic: Caselman air machinegun
Replies: 109
Views: 31558

Re: Caselman air machinegun

You cannot see the blueprints for this weapon in the directions in the first message. Do you have them, Jack, so you can see them? Or else, do you know where they are on the web? :?
by hectmarr
Sat Apr 24, 2021 10:14 pm
Forum: Pneumatic Cannons
Topic: How to make an Air cannon sound cooler/louder?
Replies: 17
Views: 951

Re: How to make an Air cannon sound cooler/louder?

Try to cover the muzzle of the firing cannon with a piece of tape. It is not a question of introducing anything, rather of obstructing the muzzle of the barrel with plastic tape. When you fire, with its standard ammunition, the tape will soften and the projectile will come out freely, but that cause...
by hectmarr
Thu Apr 22, 2021 5:42 pm
Forum: Hybrid Cannons
Topic: Xtreme-patator
Replies: 11
Views: 746

Re: Xtreme-patator

Moonbogg wrote:
Thu Apr 22, 2021 2:29 pm
150-300psi pre pressure is what, 10-20x roughly? Definitely use steel for everything. Other than that, it looks pretty nice!
Yes, between 10 and 20x
by hectmarr
Thu Apr 22, 2021 10:49 am
Forum: Hybrid Cannons
Topic: Xtreme-patator
Replies: 11
Views: 746

Re: Xtreme-patator

The gun looks nice, in general. How do you plan to measure the air-fuel mixture? On the other hand, keep in mind that the copper barrel is not very solid at 300 psi, and it is under high pressure ... if you can get a tube of steel, that is better. I have tried it with a 7X hybrid copper tube, in .25...
by hectmarr
Mon Apr 19, 2021 10:50 am
Forum: Pneumatic Cannons
Topic: Whats best valving for pneumatics
Replies: 5
Views: 496

Re: Whats best valving for pneumatics

A piston valve works well, and you can build it yourself. Actually, it is quite simple.
viewtopic.php?f=26&t=8157
spud_wiki/index.php?title=Piston_valve
This type of valve releases the air very quickly.
by hectmarr
Sun Apr 18, 2021 2:09 pm
Forum: BB, Airsoft, and Pellet Guns
Topic: Semiauto Nerf Rival with no moving parts.
Replies: 12
Views: 887

Re: Semiauto Nerf Rival with no moving parts.

ok I understand. I plan to use around that pressure that you use, 7 or 8 bar, because much more is more complicated for me. In the future I will build it. Good idea of yours to arrange the tube that houses the balls at an angle, because it is comfortable and aesthetically good. Placing it at 90º wit...
by hectmarr
Sun Apr 18, 2021 11:40 am
Forum: BB, Airsoft, and Pellet Guns
Topic: Semiauto Nerf Rival with no moving parts.
Replies: 12
Views: 887

Re: Semiauto Nerf Rival with no moving parts.

Nice work. I like it for its simplicity. I assume that the tube that houses the large balls is plugged at the free end?
What pressure do you use to shoot? I would like to build one to launch projectiles in the shape of grenades, but with the same shape ...
by hectmarr
Sat Apr 17, 2021 3:23 pm
Forum: BB, Airsoft, and Pellet Guns
Topic: Semiauto Nerf Rival with no moving parts.
Replies: 12
Views: 887

Re: Semiauto Nerf Rival with no moving parts.

This system worked perfectly for me, which is what makes 25 bb's of lead rise, caliber .22 in my replica of MAC 11. https://www.spudfiles.com/viewtopic.php?f=29&t=26856I used a small flow regulator to regulate the amount of air that rises through the tube that it keeps ammunition. What I don't like ...
by hectmarr
Sun Mar 28, 2021 3:32 pm
Forum: BB, Airsoft, and Pellet Guns
Topic: Single shot self loading bolt action Nerf Rival
Replies: 3
Views: 697

Re: Single shot self loading bolt action Nerf Rival

wow! beautiful job. I like the look of the gun, just like how it shoots. A rational bet, as a design, to play at home, calm, and without danger. :)
by hectmarr
Sun Mar 28, 2021 12:48 pm
Forum: BB, Airsoft, and Pellet Guns
Topic: Fionda Mod. 63 Semi-Auto CO2 BB gun made in Brazil
Replies: 5
Views: 2715

Re: Fionda Mod. 63 Semi-Auto CO2 BB gun made in Brazil

I like the way it shoots. It has enough energy, apart, ideal for hunting pigeons or something like that. I'm looking at the mechanism, to understand.