Search found 933 matches

by hectmarr
Sun May 09, 2021 10:17 am
Forum: Pneumatic Cannons
Topic: How to make an Air cannon sound cooler/louder?
Replies: 17
Views: 515

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

I found some plans for a 3d printer, I leave them here, and a video of how much this type of device increases the sound, from about 81dB to 99dB. Perhaps it will help the author of this topic.
https://cults3d.com/es/etiquetas/resonador
In the video, testing starts at 3:20
by hectmarr
Sat May 08, 2021 1:21 pm
Forum: General How-To & Discussion
Topic: "In the world of spuds today"
Replies: 2444
Views: 211268

Re: "In the world of spuds today"

uhhhh !!! terrible!!! :o :o I think he is more injured than the target he shot. 85,000 psi is definitely not for me. Good video, although I don't wish anyone this, but good video, anyway :?
by hectmarr
Sat May 08, 2021 1:11 pm
Forum: Pneumatic Cannons
Topic: How to make an Air cannon sound cooler/louder?
Replies: 17
Views: 515

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

Who were the guys building those beutifully machined sound guns ? Think this it https://youtu.be/GbTk-5J1gJE Oh yeah! beautiful machine, and it works excellent! but my question goes a different way. There is a user of a forum in my country, who tries to increase the sound of measured, purchased mar...
by hectmarr
Sat May 08, 2021 10:16 am
Forum: Pneumatic Cannons
Topic: How to make an Air cannon sound cooler/louder?
Replies: 17
Views: 515

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

The picture looks like theres more things going on, such as holes in the cone, and it looks like its disconnected from the barrel? While also being in a cylinder. The example I showed you is adjustable, with holes in the cone that allow you to vary the amount of noise. When the holes are completely...
by hectmarr
Fri May 07, 2021 3:26 pm
Forum: BB, Airsoft, and Pellet Guns
Topic: Semiauto Nerf Rival with no moving parts.
Replies: 12
Views: 548

Re: Semiauto Nerf Rival with no moving parts.

Very nicely done! I really like the magazine lid. A practical implementation of the valveless/popoff concept. https://www.spudfiles.com/download/file.php?id=14005 I could never solve the issue of the retention of a "cup" type pellet, to shoot the same as your animation, but with a hybrid. The probl...
by hectmarr
Fri May 07, 2021 2:23 pm
Forum: Hybrid Cannons
Topic: Xtreme-patator
Replies: 11
Views: 382

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: 382

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: 146924

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: 146924

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: 30566

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: 515

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: 382

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: 382

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: 286

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.