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by erdos4d
Tue Nov 07, 2023 8:13 pm
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Coke can to 150 meters?

Hi Everyone, I am new here and would like to ask some questions about a build I am attempting soon. I have a 120PSI compressor and I want to make a pneumatic launcher that can sling a coke can (standard 12oz/330ml) about 150 meters. I am using a coke can because that seems like a really cheap shot c...
by mark.f
Wed Nov 08, 2023 6:46 am
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Re: fl(air) gun - mechanically locked pneumatic cartridge for a 26.5mm flare gun

Any other stand out builds or ideas on here over the last 10years I’ve been absent? My holy grail would still be a large caliber cartridge ejecting semi auto. I should complete that QEV repeater build one day. There's been a lot of small and intricate hybrid builds especially by hectmarr. But ten y...
by SubsonicSpud
Wed Nov 08, 2023 2:29 am
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Re: fl(air) gun - mechanically locked pneumatic cartridge for a 26.5mm flare gun

I thought this deserved a separate thread from the earlier development . https://i.imgur.com/ZP5B0Ep.jpg Cartridge with a Polish flare gun from the 1950s based on the Soviet SPSh-44 . https://i.imgur.com/cdt0G9u.jpg Cartridge disassembled, most parts are machined from 12L14 steel apart from the bod...
by mrfoo
Fri Nov 10, 2023 7:05 am
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Re: Nazi Sonic Cannon

Well that was a load of word salad conspiracy bollocks. I feel dumber from having merely skimmed it. Thanks a bunch.

[edit] This post was made in reply to some absolute crap that jrrdw just removed, and not in reply to what's now visible up above.
by mark.f
Sat Nov 11, 2023 4:10 am
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Re: Mini Hybrid II

He's still at it! Nice work as always.
jackssmirkingrevenge wrote:
Thu Nov 09, 2023 12:26 pm
Here is what it looks like internally, if it seems a little unusual that's because it's actually part of another project that I will share at a later date:
Cryptic as always. ;) Does it have to do with cartridges?
by cur
Fri Nov 10, 2023 4:02 pm
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Yet another help request

Hello guys. I will try to keep it short. I am a total beginner who would like to learn to build a pneumatic semi-automatic BB gun as a self-defense weapon, purely for educational purposes. And this is not a sarcasm, as I am an engineer who loves to dig in ideas just for fun. I came across several vi...
by hectmarr
Sun Nov 12, 2023 7:46 am
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Re: Hybrid disk burst pressure effect on performance

Interesting research. Timing is also important, not just accumulating more pressure.
by mark.f
Sat Nov 11, 2023 4:06 am
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Re: Hybrid disk burst pressure effect on performance

Interesting find, we definitely need some more test data on hybrids to improve the modelling others have done.
by jrrdw
Sat Nov 11, 2023 2:56 pm
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Re: Nazi Sonic Cannon

Thread cleaned, thanks guys!
by mrfoo
Mon Nov 13, 2023 1:19 am
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Re: Compression Ignition Hybrid Testbed

Back in the day, we had little diesel aero engines that ran on a mix of ether and castor oil. A good source for ether might be one of those easy-start cans.
by hectmarr
Sun Nov 12, 2023 5:49 pm
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Re: Compression Ignition Hybrid Testbed

Another option to avoid premature ignition could be to use a high-octane fuel, but it would no longer be something you can get anywhere, and at a low price.
Vegetable oil burns very well, but it seems that it is not enough... :(
by hectmarr
Sun Nov 12, 2023 5:44 pm
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Re: Compression Ignition Hybrid Testbed

Excellent post!!! You can see all the experimental work with a single glance!!! It would be interesting for the, engineers the forum to participate, to make Jack and me aware of issues that we could not see... Any idea, concept, information or whatever, would be very welcome for this project. For my...
by hectmarr
Thu Nov 16, 2023 3:29 pm
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Re: Mini Hybrid II

That flash on the first objective was great. :o Good job and an inspiration to many, for sure.
I am compiling these new tests with the pure hybrid, in "Jack's Bible" 8-)
by mark.f
Sun Nov 19, 2023 9:56 pm
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Re: Mini Hybrid II

jackssmirkingrevenge wrote:
Thu Nov 16, 2023 1:10 pm
That's a hell of a BB gun. :D
by Pennywise
Thu Nov 23, 2023 9:47 am
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Hybrid geometry

I have attempted to find some testing in regard to the geometry of a chamber-barrel transition, but it has been mostly fruitless so far. I am building a hybrid from a section of 1.5"ID stainless. The barrel will be .5"ID. The actual combustion portion of the chamber will be ~6" long. From what I hav...