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Short question topic

A place to ask general spud cannon related questions.
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Re: Short question topic

Unread postAuthor: wyz2285 » Sun Jan 28, 2018 11:27 am

I have been working on ball bearing and marble accuracy and preliminary tests suggest blowby improves accuracy with hard spherical projectiles in hard barrels. I was surprised.
Then I'll try one of these wide bores and see if it's true.
My general opinion is that while a hop-up system makes airsoft playable in terms of handguns and assault rifles, there are too many variables in the way the spin is imparted for it to lead to meaningful accuracy at long range. Apart from that, inducing the spin robs the BB of energy that reduces its impact even if it does manage to connect with the target. The ultimate sniper system would combine accurate range estimation along with appropriate drop compensation.

The Airsoft Trajectory Project is also an interesting link.

I'm almost certain a straight barrel with no hop up would be more consistent down range, but for airsoft BB the drop would be very significant. I have read that too, however the articule is rather old and many new things came up. The old airguns I made with ~6mm ID aluminum extrusion tubes were very accurate, however I never attempt long shots because the bb drop. In order to have the same range the FPS needed would be seriously unsafe.
I think I'll cook up that rig I mentioned above to test out, once the mid-terms are over.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Re: Short question topic

Unread postAuthor: farcticox1 » Sun Jan 28, 2018 5:30 pm

Tight barrel definitely gave me huge inaccuracies with my airsoft, the BBs weren't free to roll down the barrel, after I polished it out so they rolled down easily it was much better. An early construction I made used 7mm ID tube with 1/4"(6.35mm) Steel BBs, it was very accurate at short range.
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Last edited by farcticox1 on Tue Jan 30, 2018 12:13 pm, edited 1 time in total.
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Re: Short question topic

Unread postAuthor: Cthulhu » Mon Jan 29, 2018 12:07 am

Does anyone have experience casting with silicone/rubber/latex from home Depot?
I have experience casting with expanding foam but they don't have the mass I need for good (safe and far flying) projectiles.
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Re: Short question topic

Unread postAuthor: wyz2285 » Tue Jan 30, 2018 6:54 am

the BBs weren't free to roll down the barrel, after I polished it out so they rolled down easily it was much better.

Could be you have improved the bore quality after polishing, doesn't necessarily because of the diameter.
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Re: Short question topic

Unread postAuthor: jackssmirkingrevenge » Tue Jan 30, 2018 7:19 am

Anatine Duo wrote:I don't have the physics background to comment intelligently, but I have been working on ball bearing and marble accuracy and preliminary tests suggest blowby improves accuracy with hard spherical projectiles in hard barrels.


Do you have any data comparing group sizes with different barrel diameters?
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Re: Short question topic

Unread postAuthor: Anatine Duo » Tue Jan 30, 2018 5:20 pm

not enough barrels for that test ;)
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Re: Short question topic

Unread postAuthor: wyz2285 » Wed Jan 31, 2018 12:38 pm

Jack you have talked to taofledermaus before, could you shot him a msg asking him to do a video about this? I can supply the rig, (clear barrel, hop up etc)
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Re: Short question topic

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Re: Short question topic

Unread postAuthor: jackssmirkingrevenge » Thu Feb 01, 2018 7:07 am

wyz2285 wrote:Jack you have talked to taofledermaus before, could you shot him a msg asking him to do a video about this? I can supply the rig, (clear barrel, hop up etc)


I could, however IIRC he's still limited to same 1,000 frames per second cameras that we've been using, you need someone with those 10,000 frame per second cameras to have meaningful visuals.
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Re: Short question topic

Unread postAuthor: Ragnarok » Thu Feb 01, 2018 8:07 am

jackssmirkingrevenge wrote:I could, however IIRC he's still limited to same 1,000 frames per second cameras that we've been using

I'm guessing it's a while since you last watched. This is what he uses now: http://www.krontech.ca/
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Does that thing kinda look like a big cat to you?
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Re: Short question topic

Unread postAuthor: jackssmirkingrevenge » Sat Feb 03, 2018 7:24 am

Ragnarok wrote:I'm guessing it's a while since you last watched


huh... they even use his clips in their promo:



Too much going on online to keep up with everything!
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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Re: Short question topic

Unread postAuthor: hectmarr » Thu Mar 01, 2018 11:16 am

Does anyone know if you can ruin a .22 caliber shark cannon, if you drill a hole in the middle of it? It would be this 2mm hole. My question is whether it would alter the work of the fluted ...
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Re: Short question topic

Unread postAuthor: wyz2285 » Sat Mar 03, 2018 7:03 pm

Done it before, didn't really mess it up. You're supposed to drill in the grooves (calculate the position of the grooves) but 2mm it's definitely wider than a .22 rifling groove. I made a brass piece that matchs the bore and just pushes it back and forth to smooth the hole and I'm still doing 1inch group at 25m
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CpTn_lAw wrote::D "yay, me wanna make big multishot pnoob with 1000 psi foot pump compressor using diamond as main material. Do you think wet bread make good sealant? " :D
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Re: Short question topic

Unread postAuthor: hectmarr » Sat Mar 03, 2018 9:32 pm

wyz2285 wrote:Done it before, didn't really mess it up. You're supposed to drill in the grooves (calculate the position of the grooves) but 2mm it's definitely wider than a .22 rifling groove. I made a brass piece that matchs the bore and just pushes it back and forth to smooth the hole and I'm still doing 1inch group at 25m

Ok, I understand what I should do. Thank you
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Re: Short question topic

Unread postAuthor: Cthulhu » Sun Mar 04, 2018 11:12 am

What's the best way to install a spark plug into a hybrid made of sch. 40 black steel? Should I machine a custom coupler with NPT threads on one side and 14mm X 1.25mm threads for the other side?

Or am I better off using some other ignition source.
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Re: Short question topic

Unread postAuthor: jackssmirkingrevenge » Mon Mar 05, 2018 8:25 pm

What mixes do you intend to go to?
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hectmarr wrote:You have to make many weapons, because this field is long and short life
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