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mini hybrid win!

Post questions and info about hybrid (compressed gas with fuel) powered cannons here. This includes discussion about fuels, ratios, ignition systems, build types, safety, and anything else relevant.
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Unread postAuthor: MrCrowley » Fri Oct 29, 2010 2:45 pm

Packs a bigger punch than I first expected :)
I second Rag's motion, you have any chrony or HGDT readings?
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Unread postAuthor: Technician1002 » Fri Oct 29, 2010 3:58 pm

As far as damage to the projectile, this is damage after punching holes in stuff. The damage is from remaining KE after going through the crate.
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Unread postAuthor: POLAND_SPUD » Fri Oct 29, 2010 5:05 pm

wow that's actually pretty impressive
unlike most of your gayish & weak stuff in 1mm calibre that can't kill a fly :D (yes that's including the incredible farting machine (version #87.2.6b) )
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Unread postAuthor: Ragnarok » Fri Oct 29, 2010 6:05 pm

Technician1002 wrote:As far as damage to the projectile, this is damage after punching holes in stuff.

Yeah, that's "wasted" KE, either from impact with the targets or the backstop. But my point remains, it doesn't actually take that much energy to deform a 12g like that, so it may be deceptive.
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: jackssmirkingrevenge » Sat Oct 30, 2010 3:58 am

Ragnarok wrote:Hmm... this doesn't actually seem to be indicative of all that much energy. I've shot air rifles at empty CO2 cartridges before, and they usually look like that after just a shot or two.


That's unfair, I could have made the barrel 6 feet long and the chamber 10 times bigger but I have neighbours to think about ;) for what it is it packs quite a punch.

Speaking of which, I had a morning of chrony testing planned but bloody typical, my last ignitor gives out! I did manage one chrony shot though, at 10x with a 30 gram capsule, 278 feet per second - that works out at 79 ft/lbs (slightly better than your air rifles eh Rag ;)) which is 15 ft/lbs more than the maximum my HPA coaxial managed with the same projectile.

Here's the video of the shot at 420 frames per second:

[youtube]http://www.youtube.com/watch?v=tRMvbFFLscU[/youtube]

My previous tests with piezo ignition suggests that I can happily take this to 16x so the performance potential is even greater, now to find a bloody cigarette lighter!

Edit: unbelievable, all the shops I went to only had the flint type lighters :-/ in the meantime, gave it a go as a burst disk pneumatic fitted with 3 layers of photo paper disk (one layer bursts at around 160 psi) and hooked up to an 800 psi supply, it was surprisingly quieter than the hybrid and less powerful than a 10x shot, piercing the power supply case but not nearly as much as the hybrid.
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Unread postAuthor: jackssmirkingrevenge » Fri Nov 05, 2010 9:55 am

To take a break from fiddling with poncy little cartridges, had a go with the 0.75" hybrid at 12x :D

[youtube]http://www.youtube.com/watch?v=BwiCYiDx-pg[/youtube]

Here it is at 8x vs a used smoke grenade, just 220 fps but still quite impressive:

[youtube]http://www.youtube.com/watch?v=NeUIVo4D8Eg[/youtube]

edit: toy truck take two :D

[youtube]http://www.youtube.com/watch?v=awlL1024x74[/youtube]
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Here's the chrony reading for the plate shot, for a 30 gram projectile that's just under 100 ft/lbs :D
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Unread postAuthor: jackssmirkingrevenge » Sat Nov 06, 2010 9:39 am

Found the projectile from the toy truck shot, is that enough damage for monsieur Ragnarok :D
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Unread postAuthor: Ragnarok » Sat Nov 06, 2010 10:02 am

jackssmirkingrevenge wrote:Is that enough damage for monsieur Ragnarok :D

Looks more impressive (and seems to have hit quite a solid square edge). Was that just one shot, or the result of several?
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Unread postAuthor: jackssmirkingrevenge » Sat Nov 06, 2010 12:12 pm

Ragnarok wrote:Looks more impressive (and seems to have hit quite a solid square edge). Was that just one shot, or the result of several?


Just one shot, it basically hit the centreline on the truck's bonnet hence the damage.
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Unread postAuthor: SpudFarm » Sat Nov 06, 2010 1:17 pm

This is great! I like those creations of yours. Eventhough I don't build alot anymore due to other activities it is now tempting to make a basic hybrid..

Bring on next pay-check! :D
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Unread postAuthor: jackssmirkingrevenge » Sun Nov 07, 2010 11:00 pm

Thanks :) this was just a test rig but it's such fun I was thinking of re-making it "properly", perhaps in the configuration I was planning for my previous HPA 0.75" prototype:

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Unread postAuthor: JDP12 » Sun Nov 07, 2010 11:41 pm

awesome! Damage looks alot better, and that ft/lbs is comparable to a .22 LR almost. with a longer barrel in a carbine configuration or such would probably boost ft/lbs alot.
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 08, 2010 12:47 am

JDP12 wrote:with a longer barrel in a carbine configuration or such would probably boost ft/lbs alot.


This is with a 2 foot barrel, considering the tiny chamber volume I'm sure it could be made more powerful with a bigger chamber but it's already deafening as it is. I wish I had the space to make an AMR type hybrid that would end up looking something like this but oh, the curse of working within an urban environment :?
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Unread postAuthor: POLAND_SPUD » Mon Nov 08, 2010 7:39 am

the curse of working within an urban environment
You can always make a large silencer for it.
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Unread postAuthor: jackssmirkingrevenge » Mon Nov 08, 2010 9:00 am

POLAND_SPUD wrote:You can always make a large silencer for it.


Actually, a hybrid version of the VSSK "Vychlop" would be one heck of a project...

Image

hmmm...
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